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INDEX PAGE
1 SCOPE 3
2 COVERAGE 3
3 SERVICE CONDITIONS 331 Sour Service 3
32 Associated Service Conditions 4
4 MATERIALS 4
41 General 4
42 Carbon Carbon Manganese and Low-Alloy Steel
Pressure Vessels 7
43 Carbon Carbon Manganese and Low Alloy Steel
Heat-Exchanger Tube Bundles 7
44 Carbon and Carbon Manganese Steel Process Pipework 845 Hydrogen Induced Step Cracking (HIC) Tests 9
46 Steel Pipes for Major Pipeline Construction 10
47 Stainless Steel Pipework 10
48 Pipe Flanges and Fittings (Forged or Fabricated)
in Carbon Steel 10
49 Downhole Tubulars Wellheads Christmas Trees
and Completion Equipment 11
410 Valves 11
411 Rotating Machinery 13
412 Instrumentation 16
413 Internal Bolting 17
414 External Bolting 17
415 Bellows 18
416 Metallic Overlays 18
5 WELDING AND FABRICATION 18
51 Approval of Heat-Treatment Procedure 18
52 Small Bore Carbon Steel Pipework [Less than
DN 75 mm (3 inch) NPS] 19
53 Possible Avoidance of Post Weld Heat Treatment 19
54 Welding Procedure Qualification Tests 20
6 IDENTIFICATION STAMPING AND MARKING 21
61 Hard Stamps 21
62 Marking 21
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7 INSPECTION 21
8 EXTERNAL PROTECTION - STAINLESS STEELS 22
APPENDIX A
Prevention of Stress Corrosion Cracking in Sour
Service with ChloridesRequirements for Austentic Stainless Steels 23
APPENDIX B
Prevention of Stress Corrosion Cracking in Sour
Service with Caustic or other Alkaline Process Fluids 24
APPENDIX C
Specification for Steel Plate (Z Quality) 26
APPENDIX D
Abbreviations 31
APPENDIX E
List of Reference Standards 32
GENERAL NOTE
Portions of this Specification have been changed from
the previous edition The locations of changes have
been marked with a bar in the margin as shown to theright of this paragraph In some cases the changes are
significant while in other cases the changes
reflect minor editorial adjustments
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1 SCOPE
11 This Specification states ADMA-OPCO general requirements on materials
of construction for equipment handling fluids containing water and hydrogen
sulphide (sour environments) All materials shall meet the requirements of
NACE Standard MR0175 (subsequently referred to in this document as the
NACE Standard) except as amplified and modified herein
2 COVERAGE
21 The NACE Standard defines sour service and recommends materials which
will not fail by sulphide stress cracking (SSC) in sour environments However
it does not cover certain sour duties nor associated failure mechanisms in sour
service
This Specification modifies and extends where necessary the requirements of
the NACE Standard providing additional guidance for materials on sourservice in the presence of hydrogen chlorides alkalis and amines
3 SERVICE CONDITIONS
31 Sour Service
311 The definitions for sour services by NACE Standard MR0175 are
accepted by ADMA-OPCO for systems with less than 10 mol H2S
All systems with 10 mol or more of H2S are regarded as sour in this
Specification irrespective of the operating pressure and temperature
NB
Where the NACE Standard refers to total pressure this shall be
taken to mean total design pressure in the context of this Specification
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32 Associated Service Conditions
321 This Specification states as listed below certain additional requirements
that apply for sour service in the presence of hydrogen chlorides
alkalis and amines ADMA-OPCO will specify when these service
conditions are applicable-
a Where the presence of hydrogen resulting from sour service
could lead not only to SSC but also hydrogen blistering or
step cracking Consideration shall be given to employing Z
quality grades of steel materials and these shall conform to
the requirements of the Appendix C of this specification
b Where chlorides are present in sour service but where the
chloride level and PH etc permit the use of austenitic stainless
steels Appendix A of this Specification shall apply
c For sour service in association with alkalis or amines the
requirements of Appendix B shall apply as appropriate
4 MATERIALS
All materials for sour service as defined in this Specification shall comply fully with
the NACE Standard except as modified or extended below
41 General
Materials shall be selected from those permitted in the NACE Standard
411 All castings shall be suitably heat treated after welding operations
have been performed This requirement also applies to the weld repair
of defects irrespective of size The practice of leaving lsquoas welded
areas in castings to be used for sour service is unacceptable to
ADMA-OPCO
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All repair welds shall be heat treated as indicated in the following table-
MATERIAL HEAT TREATMENT REQUIREMENT
a Carbon and Carbon Stress Relieve
Manganese Steels
b Martensitic Stainless Reheat treat completely
Steels eg 11-13 or double temper to the
Chromium Steel NACE requirements
c Austenitic Stainless Stress Relieve or Solution
Steel Anneal
412 Cast irons and ferritic ductile (nodular) iron eg ASTM A 395 are
unacceptable for pressure-retaining parts The use of these materials
for non-pressure low stressed components shall be subject to approval
by ADMA-OPCOQAD Austenitic irons are also unacceptable for
pressure-retaining parts except as permitted by para 4112 (b) none
of these materials shall be weld repaired
413 The selection of materials for a particular sour duty shall take into
account not only any requirements arising from para 321 of this
Specification but also resistance to general corrosion
The pH value of the process stream and the presence or absence of
corrodents such as Oxygen carbon dioxide chlorides etc are of
particular importance
414 When the chloride content and the corrosive conditions are such that
they cannot be handled by austenitic steels (refer to para 321) more
highly alloyed materials such as Incoloy 825 Inconel 625 Hastelloy C
etc shall be selected according to the process conditions
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415 Where the process duty is such that a wet gas environment exists in
one part of the vessel and multiphase (oil gas water) system exists in
another part of the same vessel the material of construction for the
entire vessel shall be suitable for the more severe sour gas conditions
416 High strength steels at high levels of stress such as internal boltings
springs bellows and parts of some rotating machinery require specificattention Experience has shown that they are susceptible to SSC in
lower concentrations of wet hydrogen sulphide than indicated by the
NACE Standard definition These components shall therefore
comply with the NACE Standard when in contact with any concentration
of wet hydrogen sulphide
417 Where hydrogen blistering or step cracking may occur steel grades
with additional chemical composition limits and guaranteed through
thickness mechanical properties such as Z30 quality steel grades to
the requirements of Appendix C of this specification should beconsidered
Inhibiting the process stream or applying a protective lining to the steel
surface can also be considered
418 Nitrile rubbers are unacceptable but fluorelastomers eg Viton and
PTFE may be proposed for approval by ADMA-OPCOQAD All non-
metallic materials proposed for O rings seals seal rings etc shall be
tested and proved suitable for the environment before use
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42 Carbon Carbon Manganese and Low Alloy Steel Pressure Vessel
421 Unless otherwise approved by AMDA-OPCO QAD pressure vessels
including heat exchanger shells channels and floating heads shall be
stress relieved Where hydrogen sulphide contents in excess of 10
MOL are encountered stress relief is mandatory in all cases
422 Stress-relieving and heat-treatment procedures shall be as required by
the appropriate design code and ADMA-OPCO Specification SP-1035
423 Steel grades with additional chemical composition limits and
guaranteed through thickness mechanical properties (ie Z30
grades Appendix C) or HIC tested plate in accordance with 45
of this Specification shall be used for all pressure vessels on
sour service
424 Internal bolting eg floating head bolts and nuts of heat exchangerssubject to sour environments shall be selected to be resistant to SSC
(see sub-section 413 of this Specification)
425 Pressure vessels on sour service in materials other than carbon carbon
manganese and low-alloy steels eg austenitic stainless steels clad
plate etc shall be subject to ADMA-OPCOQAD specification andor
approval
43 Carbon Carbon Manganese and Low-Alloy Steel Heat Exchanger
Tube Bundles
431 Where tube end welding is specified special fabrication procedure are
necessary
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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INDEX PAGE
1 SCOPE 3
2 COVERAGE 3
3 SERVICE CONDITIONS 331 Sour Service 3
32 Associated Service Conditions 4
4 MATERIALS 4
41 General 4
42 Carbon Carbon Manganese and Low-Alloy Steel
Pressure Vessels 7
43 Carbon Carbon Manganese and Low Alloy Steel
Heat-Exchanger Tube Bundles 7
44 Carbon and Carbon Manganese Steel Process Pipework 845 Hydrogen Induced Step Cracking (HIC) Tests 9
46 Steel Pipes for Major Pipeline Construction 10
47 Stainless Steel Pipework 10
48 Pipe Flanges and Fittings (Forged or Fabricated)
in Carbon Steel 10
49 Downhole Tubulars Wellheads Christmas Trees
and Completion Equipment 11
410 Valves 11
411 Rotating Machinery 13
412 Instrumentation 16
413 Internal Bolting 17
414 External Bolting 17
415 Bellows 18
416 Metallic Overlays 18
5 WELDING AND FABRICATION 18
51 Approval of Heat-Treatment Procedure 18
52 Small Bore Carbon Steel Pipework [Less than
DN 75 mm (3 inch) NPS] 19
53 Possible Avoidance of Post Weld Heat Treatment 19
54 Welding Procedure Qualification Tests 20
6 IDENTIFICATION STAMPING AND MARKING 21
61 Hard Stamps 21
62 Marking 21
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7 INSPECTION 21
8 EXTERNAL PROTECTION - STAINLESS STEELS 22
APPENDIX A
Prevention of Stress Corrosion Cracking in Sour
Service with ChloridesRequirements for Austentic Stainless Steels 23
APPENDIX B
Prevention of Stress Corrosion Cracking in Sour
Service with Caustic or other Alkaline Process Fluids 24
APPENDIX C
Specification for Steel Plate (Z Quality) 26
APPENDIX D
Abbreviations 31
APPENDIX E
List of Reference Standards 32
GENERAL NOTE
Portions of this Specification have been changed from
the previous edition The locations of changes have
been marked with a bar in the margin as shown to theright of this paragraph In some cases the changes are
significant while in other cases the changes
reflect minor editorial adjustments
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1 SCOPE
11 This Specification states ADMA-OPCO general requirements on materials
of construction for equipment handling fluids containing water and hydrogen
sulphide (sour environments) All materials shall meet the requirements of
NACE Standard MR0175 (subsequently referred to in this document as the
NACE Standard) except as amplified and modified herein
2 COVERAGE
21 The NACE Standard defines sour service and recommends materials which
will not fail by sulphide stress cracking (SSC) in sour environments However
it does not cover certain sour duties nor associated failure mechanisms in sour
service
This Specification modifies and extends where necessary the requirements of
the NACE Standard providing additional guidance for materials on sourservice in the presence of hydrogen chlorides alkalis and amines
3 SERVICE CONDITIONS
31 Sour Service
311 The definitions for sour services by NACE Standard MR0175 are
accepted by ADMA-OPCO for systems with less than 10 mol H2S
All systems with 10 mol or more of H2S are regarded as sour in this
Specification irrespective of the operating pressure and temperature
NB
Where the NACE Standard refers to total pressure this shall be
taken to mean total design pressure in the context of this Specification
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32 Associated Service Conditions
321 This Specification states as listed below certain additional requirements
that apply for sour service in the presence of hydrogen chlorides
alkalis and amines ADMA-OPCO will specify when these service
conditions are applicable-
a Where the presence of hydrogen resulting from sour service
could lead not only to SSC but also hydrogen blistering or
step cracking Consideration shall be given to employing Z
quality grades of steel materials and these shall conform to
the requirements of the Appendix C of this specification
b Where chlorides are present in sour service but where the
chloride level and PH etc permit the use of austenitic stainless
steels Appendix A of this Specification shall apply
c For sour service in association with alkalis or amines the
requirements of Appendix B shall apply as appropriate
4 MATERIALS
All materials for sour service as defined in this Specification shall comply fully with
the NACE Standard except as modified or extended below
41 General
Materials shall be selected from those permitted in the NACE Standard
411 All castings shall be suitably heat treated after welding operations
have been performed This requirement also applies to the weld repair
of defects irrespective of size The practice of leaving lsquoas welded
areas in castings to be used for sour service is unacceptable to
ADMA-OPCO
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All repair welds shall be heat treated as indicated in the following table-
MATERIAL HEAT TREATMENT REQUIREMENT
a Carbon and Carbon Stress Relieve
Manganese Steels
b Martensitic Stainless Reheat treat completely
Steels eg 11-13 or double temper to the
Chromium Steel NACE requirements
c Austenitic Stainless Stress Relieve or Solution
Steel Anneal
412 Cast irons and ferritic ductile (nodular) iron eg ASTM A 395 are
unacceptable for pressure-retaining parts The use of these materials
for non-pressure low stressed components shall be subject to approval
by ADMA-OPCOQAD Austenitic irons are also unacceptable for
pressure-retaining parts except as permitted by para 4112 (b) none
of these materials shall be weld repaired
413 The selection of materials for a particular sour duty shall take into
account not only any requirements arising from para 321 of this
Specification but also resistance to general corrosion
The pH value of the process stream and the presence or absence of
corrodents such as Oxygen carbon dioxide chlorides etc are of
particular importance
414 When the chloride content and the corrosive conditions are such that
they cannot be handled by austenitic steels (refer to para 321) more
highly alloyed materials such as Incoloy 825 Inconel 625 Hastelloy C
etc shall be selected according to the process conditions
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415 Where the process duty is such that a wet gas environment exists in
one part of the vessel and multiphase (oil gas water) system exists in
another part of the same vessel the material of construction for the
entire vessel shall be suitable for the more severe sour gas conditions
416 High strength steels at high levels of stress such as internal boltings
springs bellows and parts of some rotating machinery require specificattention Experience has shown that they are susceptible to SSC in
lower concentrations of wet hydrogen sulphide than indicated by the
NACE Standard definition These components shall therefore
comply with the NACE Standard when in contact with any concentration
of wet hydrogen sulphide
417 Where hydrogen blistering or step cracking may occur steel grades
with additional chemical composition limits and guaranteed through
thickness mechanical properties such as Z30 quality steel grades to
the requirements of Appendix C of this specification should beconsidered
Inhibiting the process stream or applying a protective lining to the steel
surface can also be considered
418 Nitrile rubbers are unacceptable but fluorelastomers eg Viton and
PTFE may be proposed for approval by ADMA-OPCOQAD All non-
metallic materials proposed for O rings seals seal rings etc shall be
tested and proved suitable for the environment before use
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42 Carbon Carbon Manganese and Low Alloy Steel Pressure Vessel
421 Unless otherwise approved by AMDA-OPCO QAD pressure vessels
including heat exchanger shells channels and floating heads shall be
stress relieved Where hydrogen sulphide contents in excess of 10
MOL are encountered stress relief is mandatory in all cases
422 Stress-relieving and heat-treatment procedures shall be as required by
the appropriate design code and ADMA-OPCO Specification SP-1035
423 Steel grades with additional chemical composition limits and
guaranteed through thickness mechanical properties (ie Z30
grades Appendix C) or HIC tested plate in accordance with 45
of this Specification shall be used for all pressure vessels on
sour service
424 Internal bolting eg floating head bolts and nuts of heat exchangerssubject to sour environments shall be selected to be resistant to SSC
(see sub-section 413 of this Specification)
425 Pressure vessels on sour service in materials other than carbon carbon
manganese and low-alloy steels eg austenitic stainless steels clad
plate etc shall be subject to ADMA-OPCOQAD specification andor
approval
43 Carbon Carbon Manganese and Low-Alloy Steel Heat Exchanger
Tube Bundles
431 Where tube end welding is specified special fabrication procedure are
necessary
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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7 INSPECTION 21
8 EXTERNAL PROTECTION - STAINLESS STEELS 22
APPENDIX A
Prevention of Stress Corrosion Cracking in Sour
Service with ChloridesRequirements for Austentic Stainless Steels 23
APPENDIX B
Prevention of Stress Corrosion Cracking in Sour
Service with Caustic or other Alkaline Process Fluids 24
APPENDIX C
Specification for Steel Plate (Z Quality) 26
APPENDIX D
Abbreviations 31
APPENDIX E
List of Reference Standards 32
GENERAL NOTE
Portions of this Specification have been changed from
the previous edition The locations of changes have
been marked with a bar in the margin as shown to theright of this paragraph In some cases the changes are
significant while in other cases the changes
reflect minor editorial adjustments
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1 SCOPE
11 This Specification states ADMA-OPCO general requirements on materials
of construction for equipment handling fluids containing water and hydrogen
sulphide (sour environments) All materials shall meet the requirements of
NACE Standard MR0175 (subsequently referred to in this document as the
NACE Standard) except as amplified and modified herein
2 COVERAGE
21 The NACE Standard defines sour service and recommends materials which
will not fail by sulphide stress cracking (SSC) in sour environments However
it does not cover certain sour duties nor associated failure mechanisms in sour
service
This Specification modifies and extends where necessary the requirements of
the NACE Standard providing additional guidance for materials on sourservice in the presence of hydrogen chlorides alkalis and amines
3 SERVICE CONDITIONS
31 Sour Service
311 The definitions for sour services by NACE Standard MR0175 are
accepted by ADMA-OPCO for systems with less than 10 mol H2S
All systems with 10 mol or more of H2S are regarded as sour in this
Specification irrespective of the operating pressure and temperature
NB
Where the NACE Standard refers to total pressure this shall be
taken to mean total design pressure in the context of this Specification
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32 Associated Service Conditions
321 This Specification states as listed below certain additional requirements
that apply for sour service in the presence of hydrogen chlorides
alkalis and amines ADMA-OPCO will specify when these service
conditions are applicable-
a Where the presence of hydrogen resulting from sour service
could lead not only to SSC but also hydrogen blistering or
step cracking Consideration shall be given to employing Z
quality grades of steel materials and these shall conform to
the requirements of the Appendix C of this specification
b Where chlorides are present in sour service but where the
chloride level and PH etc permit the use of austenitic stainless
steels Appendix A of this Specification shall apply
c For sour service in association with alkalis or amines the
requirements of Appendix B shall apply as appropriate
4 MATERIALS
All materials for sour service as defined in this Specification shall comply fully with
the NACE Standard except as modified or extended below
41 General
Materials shall be selected from those permitted in the NACE Standard
411 All castings shall be suitably heat treated after welding operations
have been performed This requirement also applies to the weld repair
of defects irrespective of size The practice of leaving lsquoas welded
areas in castings to be used for sour service is unacceptable to
ADMA-OPCO
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All repair welds shall be heat treated as indicated in the following table-
MATERIAL HEAT TREATMENT REQUIREMENT
a Carbon and Carbon Stress Relieve
Manganese Steels
b Martensitic Stainless Reheat treat completely
Steels eg 11-13 or double temper to the
Chromium Steel NACE requirements
c Austenitic Stainless Stress Relieve or Solution
Steel Anneal
412 Cast irons and ferritic ductile (nodular) iron eg ASTM A 395 are
unacceptable for pressure-retaining parts The use of these materials
for non-pressure low stressed components shall be subject to approval
by ADMA-OPCOQAD Austenitic irons are also unacceptable for
pressure-retaining parts except as permitted by para 4112 (b) none
of these materials shall be weld repaired
413 The selection of materials for a particular sour duty shall take into
account not only any requirements arising from para 321 of this
Specification but also resistance to general corrosion
The pH value of the process stream and the presence or absence of
corrodents such as Oxygen carbon dioxide chlorides etc are of
particular importance
414 When the chloride content and the corrosive conditions are such that
they cannot be handled by austenitic steels (refer to para 321) more
highly alloyed materials such as Incoloy 825 Inconel 625 Hastelloy C
etc shall be selected according to the process conditions
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415 Where the process duty is such that a wet gas environment exists in
one part of the vessel and multiphase (oil gas water) system exists in
another part of the same vessel the material of construction for the
entire vessel shall be suitable for the more severe sour gas conditions
416 High strength steels at high levels of stress such as internal boltings
springs bellows and parts of some rotating machinery require specificattention Experience has shown that they are susceptible to SSC in
lower concentrations of wet hydrogen sulphide than indicated by the
NACE Standard definition These components shall therefore
comply with the NACE Standard when in contact with any concentration
of wet hydrogen sulphide
417 Where hydrogen blistering or step cracking may occur steel grades
with additional chemical composition limits and guaranteed through
thickness mechanical properties such as Z30 quality steel grades to
the requirements of Appendix C of this specification should beconsidered
Inhibiting the process stream or applying a protective lining to the steel
surface can also be considered
418 Nitrile rubbers are unacceptable but fluorelastomers eg Viton and
PTFE may be proposed for approval by ADMA-OPCOQAD All non-
metallic materials proposed for O rings seals seal rings etc shall be
tested and proved suitable for the environment before use
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42 Carbon Carbon Manganese and Low Alloy Steel Pressure Vessel
421 Unless otherwise approved by AMDA-OPCO QAD pressure vessels
including heat exchanger shells channels and floating heads shall be
stress relieved Where hydrogen sulphide contents in excess of 10
MOL are encountered stress relief is mandatory in all cases
422 Stress-relieving and heat-treatment procedures shall be as required by
the appropriate design code and ADMA-OPCO Specification SP-1035
423 Steel grades with additional chemical composition limits and
guaranteed through thickness mechanical properties (ie Z30
grades Appendix C) or HIC tested plate in accordance with 45
of this Specification shall be used for all pressure vessels on
sour service
424 Internal bolting eg floating head bolts and nuts of heat exchangerssubject to sour environments shall be selected to be resistant to SSC
(see sub-section 413 of this Specification)
425 Pressure vessels on sour service in materials other than carbon carbon
manganese and low-alloy steels eg austenitic stainless steels clad
plate etc shall be subject to ADMA-OPCOQAD specification andor
approval
43 Carbon Carbon Manganese and Low-Alloy Steel Heat Exchanger
Tube Bundles
431 Where tube end welding is specified special fabrication procedure are
necessary
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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1 SCOPE
11 This Specification states ADMA-OPCO general requirements on materials
of construction for equipment handling fluids containing water and hydrogen
sulphide (sour environments) All materials shall meet the requirements of
NACE Standard MR0175 (subsequently referred to in this document as the
NACE Standard) except as amplified and modified herein
2 COVERAGE
21 The NACE Standard defines sour service and recommends materials which
will not fail by sulphide stress cracking (SSC) in sour environments However
it does not cover certain sour duties nor associated failure mechanisms in sour
service
This Specification modifies and extends where necessary the requirements of
the NACE Standard providing additional guidance for materials on sourservice in the presence of hydrogen chlorides alkalis and amines
3 SERVICE CONDITIONS
31 Sour Service
311 The definitions for sour services by NACE Standard MR0175 are
accepted by ADMA-OPCO for systems with less than 10 mol H2S
All systems with 10 mol or more of H2S are regarded as sour in this
Specification irrespective of the operating pressure and temperature
NB
Where the NACE Standard refers to total pressure this shall be
taken to mean total design pressure in the context of this Specification
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32 Associated Service Conditions
321 This Specification states as listed below certain additional requirements
that apply for sour service in the presence of hydrogen chlorides
alkalis and amines ADMA-OPCO will specify when these service
conditions are applicable-
a Where the presence of hydrogen resulting from sour service
could lead not only to SSC but also hydrogen blistering or
step cracking Consideration shall be given to employing Z
quality grades of steel materials and these shall conform to
the requirements of the Appendix C of this specification
b Where chlorides are present in sour service but where the
chloride level and PH etc permit the use of austenitic stainless
steels Appendix A of this Specification shall apply
c For sour service in association with alkalis or amines the
requirements of Appendix B shall apply as appropriate
4 MATERIALS
All materials for sour service as defined in this Specification shall comply fully with
the NACE Standard except as modified or extended below
41 General
Materials shall be selected from those permitted in the NACE Standard
411 All castings shall be suitably heat treated after welding operations
have been performed This requirement also applies to the weld repair
of defects irrespective of size The practice of leaving lsquoas welded
areas in castings to be used for sour service is unacceptable to
ADMA-OPCO
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All repair welds shall be heat treated as indicated in the following table-
MATERIAL HEAT TREATMENT REQUIREMENT
a Carbon and Carbon Stress Relieve
Manganese Steels
b Martensitic Stainless Reheat treat completely
Steels eg 11-13 or double temper to the
Chromium Steel NACE requirements
c Austenitic Stainless Stress Relieve or Solution
Steel Anneal
412 Cast irons and ferritic ductile (nodular) iron eg ASTM A 395 are
unacceptable for pressure-retaining parts The use of these materials
for non-pressure low stressed components shall be subject to approval
by ADMA-OPCOQAD Austenitic irons are also unacceptable for
pressure-retaining parts except as permitted by para 4112 (b) none
of these materials shall be weld repaired
413 The selection of materials for a particular sour duty shall take into
account not only any requirements arising from para 321 of this
Specification but also resistance to general corrosion
The pH value of the process stream and the presence or absence of
corrodents such as Oxygen carbon dioxide chlorides etc are of
particular importance
414 When the chloride content and the corrosive conditions are such that
they cannot be handled by austenitic steels (refer to para 321) more
highly alloyed materials such as Incoloy 825 Inconel 625 Hastelloy C
etc shall be selected according to the process conditions
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415 Where the process duty is such that a wet gas environment exists in
one part of the vessel and multiphase (oil gas water) system exists in
another part of the same vessel the material of construction for the
entire vessel shall be suitable for the more severe sour gas conditions
416 High strength steels at high levels of stress such as internal boltings
springs bellows and parts of some rotating machinery require specificattention Experience has shown that they are susceptible to SSC in
lower concentrations of wet hydrogen sulphide than indicated by the
NACE Standard definition These components shall therefore
comply with the NACE Standard when in contact with any concentration
of wet hydrogen sulphide
417 Where hydrogen blistering or step cracking may occur steel grades
with additional chemical composition limits and guaranteed through
thickness mechanical properties such as Z30 quality steel grades to
the requirements of Appendix C of this specification should beconsidered
Inhibiting the process stream or applying a protective lining to the steel
surface can also be considered
418 Nitrile rubbers are unacceptable but fluorelastomers eg Viton and
PTFE may be proposed for approval by ADMA-OPCOQAD All non-
metallic materials proposed for O rings seals seal rings etc shall be
tested and proved suitable for the environment before use
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42 Carbon Carbon Manganese and Low Alloy Steel Pressure Vessel
421 Unless otherwise approved by AMDA-OPCO QAD pressure vessels
including heat exchanger shells channels and floating heads shall be
stress relieved Where hydrogen sulphide contents in excess of 10
MOL are encountered stress relief is mandatory in all cases
422 Stress-relieving and heat-treatment procedures shall be as required by
the appropriate design code and ADMA-OPCO Specification SP-1035
423 Steel grades with additional chemical composition limits and
guaranteed through thickness mechanical properties (ie Z30
grades Appendix C) or HIC tested plate in accordance with 45
of this Specification shall be used for all pressure vessels on
sour service
424 Internal bolting eg floating head bolts and nuts of heat exchangerssubject to sour environments shall be selected to be resistant to SSC
(see sub-section 413 of this Specification)
425 Pressure vessels on sour service in materials other than carbon carbon
manganese and low-alloy steels eg austenitic stainless steels clad
plate etc shall be subject to ADMA-OPCOQAD specification andor
approval
43 Carbon Carbon Manganese and Low-Alloy Steel Heat Exchanger
Tube Bundles
431 Where tube end welding is specified special fabrication procedure are
necessary
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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32 Associated Service Conditions
321 This Specification states as listed below certain additional requirements
that apply for sour service in the presence of hydrogen chlorides
alkalis and amines ADMA-OPCO will specify when these service
conditions are applicable-
a Where the presence of hydrogen resulting from sour service
could lead not only to SSC but also hydrogen blistering or
step cracking Consideration shall be given to employing Z
quality grades of steel materials and these shall conform to
the requirements of the Appendix C of this specification
b Where chlorides are present in sour service but where the
chloride level and PH etc permit the use of austenitic stainless
steels Appendix A of this Specification shall apply
c For sour service in association with alkalis or amines the
requirements of Appendix B shall apply as appropriate
4 MATERIALS
All materials for sour service as defined in this Specification shall comply fully with
the NACE Standard except as modified or extended below
41 General
Materials shall be selected from those permitted in the NACE Standard
411 All castings shall be suitably heat treated after welding operations
have been performed This requirement also applies to the weld repair
of defects irrespective of size The practice of leaving lsquoas welded
areas in castings to be used for sour service is unacceptable to
ADMA-OPCO
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All repair welds shall be heat treated as indicated in the following table-
MATERIAL HEAT TREATMENT REQUIREMENT
a Carbon and Carbon Stress Relieve
Manganese Steels
b Martensitic Stainless Reheat treat completely
Steels eg 11-13 or double temper to the
Chromium Steel NACE requirements
c Austenitic Stainless Stress Relieve or Solution
Steel Anneal
412 Cast irons and ferritic ductile (nodular) iron eg ASTM A 395 are
unacceptable for pressure-retaining parts The use of these materials
for non-pressure low stressed components shall be subject to approval
by ADMA-OPCOQAD Austenitic irons are also unacceptable for
pressure-retaining parts except as permitted by para 4112 (b) none
of these materials shall be weld repaired
413 The selection of materials for a particular sour duty shall take into
account not only any requirements arising from para 321 of this
Specification but also resistance to general corrosion
The pH value of the process stream and the presence or absence of
corrodents such as Oxygen carbon dioxide chlorides etc are of
particular importance
414 When the chloride content and the corrosive conditions are such that
they cannot be handled by austenitic steels (refer to para 321) more
highly alloyed materials such as Incoloy 825 Inconel 625 Hastelloy C
etc shall be selected according to the process conditions
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415 Where the process duty is such that a wet gas environment exists in
one part of the vessel and multiphase (oil gas water) system exists in
another part of the same vessel the material of construction for the
entire vessel shall be suitable for the more severe sour gas conditions
416 High strength steels at high levels of stress such as internal boltings
springs bellows and parts of some rotating machinery require specificattention Experience has shown that they are susceptible to SSC in
lower concentrations of wet hydrogen sulphide than indicated by the
NACE Standard definition These components shall therefore
comply with the NACE Standard when in contact with any concentration
of wet hydrogen sulphide
417 Where hydrogen blistering or step cracking may occur steel grades
with additional chemical composition limits and guaranteed through
thickness mechanical properties such as Z30 quality steel grades to
the requirements of Appendix C of this specification should beconsidered
Inhibiting the process stream or applying a protective lining to the steel
surface can also be considered
418 Nitrile rubbers are unacceptable but fluorelastomers eg Viton and
PTFE may be proposed for approval by ADMA-OPCOQAD All non-
metallic materials proposed for O rings seals seal rings etc shall be
tested and proved suitable for the environment before use
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42 Carbon Carbon Manganese and Low Alloy Steel Pressure Vessel
421 Unless otherwise approved by AMDA-OPCO QAD pressure vessels
including heat exchanger shells channels and floating heads shall be
stress relieved Where hydrogen sulphide contents in excess of 10
MOL are encountered stress relief is mandatory in all cases
422 Stress-relieving and heat-treatment procedures shall be as required by
the appropriate design code and ADMA-OPCO Specification SP-1035
423 Steel grades with additional chemical composition limits and
guaranteed through thickness mechanical properties (ie Z30
grades Appendix C) or HIC tested plate in accordance with 45
of this Specification shall be used for all pressure vessels on
sour service
424 Internal bolting eg floating head bolts and nuts of heat exchangerssubject to sour environments shall be selected to be resistant to SSC
(see sub-section 413 of this Specification)
425 Pressure vessels on sour service in materials other than carbon carbon
manganese and low-alloy steels eg austenitic stainless steels clad
plate etc shall be subject to ADMA-OPCOQAD specification andor
approval
43 Carbon Carbon Manganese and Low-Alloy Steel Heat Exchanger
Tube Bundles
431 Where tube end welding is specified special fabrication procedure are
necessary
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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All repair welds shall be heat treated as indicated in the following table-
MATERIAL HEAT TREATMENT REQUIREMENT
a Carbon and Carbon Stress Relieve
Manganese Steels
b Martensitic Stainless Reheat treat completely
Steels eg 11-13 or double temper to the
Chromium Steel NACE requirements
c Austenitic Stainless Stress Relieve or Solution
Steel Anneal
412 Cast irons and ferritic ductile (nodular) iron eg ASTM A 395 are
unacceptable for pressure-retaining parts The use of these materials
for non-pressure low stressed components shall be subject to approval
by ADMA-OPCOQAD Austenitic irons are also unacceptable for
pressure-retaining parts except as permitted by para 4112 (b) none
of these materials shall be weld repaired
413 The selection of materials for a particular sour duty shall take into
account not only any requirements arising from para 321 of this
Specification but also resistance to general corrosion
The pH value of the process stream and the presence or absence of
corrodents such as Oxygen carbon dioxide chlorides etc are of
particular importance
414 When the chloride content and the corrosive conditions are such that
they cannot be handled by austenitic steels (refer to para 321) more
highly alloyed materials such as Incoloy 825 Inconel 625 Hastelloy C
etc shall be selected according to the process conditions
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415 Where the process duty is such that a wet gas environment exists in
one part of the vessel and multiphase (oil gas water) system exists in
another part of the same vessel the material of construction for the
entire vessel shall be suitable for the more severe sour gas conditions
416 High strength steels at high levels of stress such as internal boltings
springs bellows and parts of some rotating machinery require specificattention Experience has shown that they are susceptible to SSC in
lower concentrations of wet hydrogen sulphide than indicated by the
NACE Standard definition These components shall therefore
comply with the NACE Standard when in contact with any concentration
of wet hydrogen sulphide
417 Where hydrogen blistering or step cracking may occur steel grades
with additional chemical composition limits and guaranteed through
thickness mechanical properties such as Z30 quality steel grades to
the requirements of Appendix C of this specification should beconsidered
Inhibiting the process stream or applying a protective lining to the steel
surface can also be considered
418 Nitrile rubbers are unacceptable but fluorelastomers eg Viton and
PTFE may be proposed for approval by ADMA-OPCOQAD All non-
metallic materials proposed for O rings seals seal rings etc shall be
tested and proved suitable for the environment before use
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42 Carbon Carbon Manganese and Low Alloy Steel Pressure Vessel
421 Unless otherwise approved by AMDA-OPCO QAD pressure vessels
including heat exchanger shells channels and floating heads shall be
stress relieved Where hydrogen sulphide contents in excess of 10
MOL are encountered stress relief is mandatory in all cases
422 Stress-relieving and heat-treatment procedures shall be as required by
the appropriate design code and ADMA-OPCO Specification SP-1035
423 Steel grades with additional chemical composition limits and
guaranteed through thickness mechanical properties (ie Z30
grades Appendix C) or HIC tested plate in accordance with 45
of this Specification shall be used for all pressure vessels on
sour service
424 Internal bolting eg floating head bolts and nuts of heat exchangerssubject to sour environments shall be selected to be resistant to SSC
(see sub-section 413 of this Specification)
425 Pressure vessels on sour service in materials other than carbon carbon
manganese and low-alloy steels eg austenitic stainless steels clad
plate etc shall be subject to ADMA-OPCOQAD specification andor
approval
43 Carbon Carbon Manganese and Low-Alloy Steel Heat Exchanger
Tube Bundles
431 Where tube end welding is specified special fabrication procedure are
necessary
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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415 Where the process duty is such that a wet gas environment exists in
one part of the vessel and multiphase (oil gas water) system exists in
another part of the same vessel the material of construction for the
entire vessel shall be suitable for the more severe sour gas conditions
416 High strength steels at high levels of stress such as internal boltings
springs bellows and parts of some rotating machinery require specificattention Experience has shown that they are susceptible to SSC in
lower concentrations of wet hydrogen sulphide than indicated by the
NACE Standard definition These components shall therefore
comply with the NACE Standard when in contact with any concentration
of wet hydrogen sulphide
417 Where hydrogen blistering or step cracking may occur steel grades
with additional chemical composition limits and guaranteed through
thickness mechanical properties such as Z30 quality steel grades to
the requirements of Appendix C of this specification should beconsidered
Inhibiting the process stream or applying a protective lining to the steel
surface can also be considered
418 Nitrile rubbers are unacceptable but fluorelastomers eg Viton and
PTFE may be proposed for approval by ADMA-OPCOQAD All non-
metallic materials proposed for O rings seals seal rings etc shall be
tested and proved suitable for the environment before use
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42 Carbon Carbon Manganese and Low Alloy Steel Pressure Vessel
421 Unless otherwise approved by AMDA-OPCO QAD pressure vessels
including heat exchanger shells channels and floating heads shall be
stress relieved Where hydrogen sulphide contents in excess of 10
MOL are encountered stress relief is mandatory in all cases
422 Stress-relieving and heat-treatment procedures shall be as required by
the appropriate design code and ADMA-OPCO Specification SP-1035
423 Steel grades with additional chemical composition limits and
guaranteed through thickness mechanical properties (ie Z30
grades Appendix C) or HIC tested plate in accordance with 45
of this Specification shall be used for all pressure vessels on
sour service
424 Internal bolting eg floating head bolts and nuts of heat exchangerssubject to sour environments shall be selected to be resistant to SSC
(see sub-section 413 of this Specification)
425 Pressure vessels on sour service in materials other than carbon carbon
manganese and low-alloy steels eg austenitic stainless steels clad
plate etc shall be subject to ADMA-OPCOQAD specification andor
approval
43 Carbon Carbon Manganese and Low-Alloy Steel Heat Exchanger
Tube Bundles
431 Where tube end welding is specified special fabrication procedure are
necessary
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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42 Carbon Carbon Manganese and Low Alloy Steel Pressure Vessel
421 Unless otherwise approved by AMDA-OPCO QAD pressure vessels
including heat exchanger shells channels and floating heads shall be
stress relieved Where hydrogen sulphide contents in excess of 10
MOL are encountered stress relief is mandatory in all cases
422 Stress-relieving and heat-treatment procedures shall be as required by
the appropriate design code and ADMA-OPCO Specification SP-1035
423 Steel grades with additional chemical composition limits and
guaranteed through thickness mechanical properties (ie Z30
grades Appendix C) or HIC tested plate in accordance with 45
of this Specification shall be used for all pressure vessels on
sour service
424 Internal bolting eg floating head bolts and nuts of heat exchangerssubject to sour environments shall be selected to be resistant to SSC
(see sub-section 413 of this Specification)
425 Pressure vessels on sour service in materials other than carbon carbon
manganese and low-alloy steels eg austenitic stainless steels clad
plate etc shall be subject to ADMA-OPCOQAD specification andor
approval
43 Carbon Carbon Manganese and Low-Alloy Steel Heat Exchanger
Tube Bundles
431 Where tube end welding is specified special fabrication procedure are
necessary
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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In order to avoid high hardnesses in the weld and heat affected zones
either PWHT shall be applied or the tube sheet shall be faced with low
carbon weld metal and stress relieved prior to tube end welding
Irrespective of the fabrication technique adopted the welding
procedure qualification tests shall be in accordance with sub-section
54 of this Specification and to TEMA Standard EEMUA-143 and any
other additional requirements recommended by ADMA-OPCOQADdepending on the project concerned
432 Tube bundles made from materials other than carbon carbon
manganese and low-alloy steels shall be specified by ADMA-OPCO
QAD
44 Carbon and Carbon Manganese Steel Process Pipework
441 Carbon steel pipework shall conform to ANSI B313 and shall be
manufactured by the seamless route to API 5L GrB unless otherwiseapproved by ADMA-OPCOQAD The material shall have a carbon
content of 023 maximum and the CE by check analysis shall not
exceed 042 based on the formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
442 Where the use of welded pipe is necessary due to the large diameter
involved these shall be made from steel grades with additional
chemical composition limits and guaranteed through thickness
mechanical properties (ie Z 30 gr ades Appendix C) or HIC
tested plate in accordance with 45 of this Specification
443 Electric Resistance Welded (ERW) pipes are not acceptable
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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444 Unless approved otherwise by ADMA-OPCOQAD welds in carbon
steel pipework for fabrication shall be made to a procedure which will
ensure that the requirements of the NACE Standar d are met without the
necessity for PWHT as outlined in sub-section 53 of this Specification
445 In some cases however PWHT may be the preferred method for
achieving the required properties Unless approved otherwise byADMA -OPCO QAD all pipework exceeding 19 mm (0750 in)
wall thickness for sour duties irrespective of location shall receive a
PWHT
446 Certificates shall be submitted for approval by ADMA-OPCOQAD
These shall include material manufacturers test certificates PWHT
charts where applicable and welding procedure qualification test results
incorporating hardness survey results on etched macro sections The
hardness surveys shall follow the procedure outlined in para 544 and
545 of this Specification
45 Hydrogen Induced Step Cracking (HIC) Tests
Where proposed as an alternative to Z 30 grades of steel or where requested
by ADMA-OPCO in the purchase order HIC tests in accordance with the
method and procedure described in NACE Standard TM 02 84 shall be carried
out
The test solution employed for these tests shall be in accordance with NACE
Standard TM 01 77
Acceptance criteria shall be-
- Crack Sensitivity Ratio (CSR) = 3
- Crack Length Ratio (CLR) = 10
- Crack Thickness Ratio (CRR) = 3
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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46 Steel Pipes for Major Pipeline Construction
Pipeline materials shall conform to ADMA-OPCO Specification SP-1011
parts 1 2 amp 3 unless otherwise specified by ADMA-OPCOQAD
47 Stainless Steel Pipework
471 Irrespective of pipe size and wall thickness welds in such materials
shall be subjected to PWHT
472 All heat treatment of stainless steel pipework shall be subject to
approval by ADMA-OPCOQAD
48 Pipe Flanges and Fittings (Forged or Fabricated in Carbon Steel)
Flanges and fittings material shall comply with the appropriate design code
requirements unless otherwise specified by ADMA-OPCOQAD All flangesand fittings shall also comply with the following mandatory requirements
481 Process of Manufacture-
a Irrespective of the requirements of the relevant design code all
flanges and seamless fittings shall be supplied in the fully
normalised condition or alternatively quenched and tempered
b Fabricated carbon steel fittings shall be manufactured from
plate meeting the Z30 grade requirements (Appendix C) or
HIC tested material in accordance with 45 of this Specification
Post weld heat treatment in the stress relieving range of
temperature ie 580 C - 620 C for 1 hr per 25 mm of
thickness shall be carried out
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
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c Fabricated fittings shall be welded by the manual metal arc
process or the submerged-arc process
d A detailed welding procedure including electrical parameters
electrode type wire and flux chemical composition shall be
submitted to ADMA-OPCOQAD for approval
482 Chemical Composition
a All materials shall conform to a maximum carbon content of
025 and a maximum sulphur content of 0025 by check
analysis
b The manufacturer shall provide a mill certificate showing the
composition of each heat of steel supplied
483 Hardness
The supplier shall demonstrate that the hardness does not exceed 248
HV 10 kg on any of the fittings and in particular on fabricated fittings
a parent HAZ weld HAZ parent metal survey shall be carried out at
10 to 15 mm below outer and inner surface
49 Downhole Tubulars Wellheads Christmas Trees and Completion Equipment
The materials requirements for these items are specified in the relevant
ADMA-OPCO Standards STD-122 STD-123 STD-124 and STD-125
respectively
410 Valves
4101 Valves materials selection and fabrication procedures shall be in
accordance with the latest revision of the NACE Standard and to this
Specification
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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4102 Valves for sour service shall be ordered from fully approved
manufacturers suppliers ie have undergone the approval procedure
currently applicable in ADMA-OPCOQAD
4103 Valve types involving full welded body construction are not acceptable
unless otherwise approved by ADMA-OPCO for special applications
(ie sub-sea)
410 Carbon content of socket welding or butt-welding carbon steel bodies
shall be limited to 025 max Carbon equivalent (CE) by check
analysis shall not exceed 042 based on the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
4105 All valve parts which can be contacted by the sour environment shall
conform to this Specification and this requirement extends to allinternals as well as the pressure-containing components
Highly stressed items which are not freely vented to atmosphere as in
the case of insulated and buried valves and bolts inside flange
protectors etc where leakage of the process stream could subject the
items to a sour environment shall conform fully to this Specification
4106 Where plated components are employed the material on which the
plating is deposited shall conform with this Specification The plating
employed shall be resistant to the environment Cadmium and zinc
plating are unsuitable as these metals corrode readily when in contact
with hydrogen sulphide
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
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4107 Where a cast ball is employed weld repair of the ball is not acceptable
4108 All valve springs shall be made from nickel base materials resistant to
SSC Acceptable spring materials are Inconel X750 Nimonic 90 and
Monel K500
4109 In bellows-sealed relief valves the springs shall be in accordance with para 498 above The bellows shall also comply with clause 415 and
para 416 of this Specification
41010 Internal bolting in valves shall be in accordance with clause 413 and
para 416 of S pecification
41011 The packing selected shall be compatible with stem material
Uninhibited graphite or carbon-type packing is unacceptable particularly
when in contact with stainless steel
411 Rotating Machinery
4111 General
a Except as stated in para 4101(c) sour service for rotating
machinery shall be taken as defined in para 31 of this
specification
b The materials selection and fabrication procedures employed
shall comply with this specification as appropriate
c Carbon and carbon manganese steel plate for fabricated
compressor casing shall be Z30 quality (see Appendix C) or
HIC tested in accordance with 45 of this Specification
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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d All fabrication welds and repair welds shall be heat treated as
listed below unless otherwise specified by ADMA-OPCOQAD
MATERIAL HEAT TREATMENT REQUIREMENT
dl Carbon and carbon PWHT at 580620 Cmanganese steels (10761148 F)
d2 Low alloy steels PWHT shall be in accordance
with the appropriate design code
d3 Martensitic stainless Re- heat completely including
steel (11-13 chromium double temper For certain welds
steel) complete heat treatment is not possible
and double tempering treatment only
will be acceptable
d4 Austenitic stainless Requires PWHT at 950 C
steel (1740 F) in accordance
with SP-1035
e All components such as internal bolting springs etc shall
comply with the relevant parts of this Specification
f Shafts and piston rods in plain carbon low and medium alloy
and 11-13 chromium steel shall be heat treated to minimise
residual stresses and shall have a hardness not exceeding 248
HV10 Kg (HRC22) and yield stress not exceeding 620 Nmm2
(90 000 lbfin2)
g Shafts in austenitic stainless steel shall be in the solution
annealed condition Where 17Cr-4Ni precipitation hardening
steel is employed it shall conform to the NACE Standard K
Monel and Inconel X-750 shafts shall also be in accordance with
the NACE Standard
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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h The straightening of shafts after completion of machining shall
not be commenced without prior approval from ADMA-OPCO
QAD
i Before any attempt is made to rectify machining errors by the
application of metal coatings approval shall be obtained from
ADMA-OPCOQAD However in any case metal coating of the journal area under proximity vibration probes and under impeller
mounting is not acceptable
j All associated equipment eg pressure vessels pipework etc
shall comply with this Specification
k All components in 11-13 chromium steel shall be double
tempered after either normalising or quenching and unless
stated otherwise in this Specification the hardness shall be 248
HV10 Kg (HRC22) maximum in conformity with the NACEStandard
4112 Centrifugal Pumps
a Centrifugal pumps shall conform to API STD 610 and any
other additional requirements specified by ADMA-OPCO
in the Purchase Order
b Austenitic nodular iron to BS 3468 Grade S2 or equivalent is
acceptable in certain cases subject to approval by ADMA-
OPCOQAD Welding of this material including repair welding
is not permitted However this material is not acceptable where
cavitation conditions are expected to occur All castings shall be
proved sound by radiography and they shall be stress relieved at
620670oslashC (11481240oslashF)
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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c Shafts in plain carbon and low alloy steels shall be totally
protected form the process stream by corrosion-resistant
sleeves cap nuts (where applicable) etc integrity of such
protection shall be checkedapproved by ADMA-OPCOQAD
Unprotected 11-13 chromium steel may be used only where it
has adequate corrosion resistance to the process fluid
4113 Centrifugal Compressors
a Centrifugal compressors shall conform to API STD 617 and any
other additional requirements specified by ADMA-OPCO in the
Purchase Order
b Fabrication processes which results in cold-worked material
eg riveting of impellers shall not be employed unless prior
approval has been obtained from ADMA-OPCOQAD However
riveted impellers are not acceptable for high speed and highdischarge pressure gas compressors
412 Instrumentation
4121 Instrument piping shall be in accordance with the associated process
line specification unless otherwise specified or approved by ADMA-
OPCO
4122 All instrument bodies manufactured from austenitic stainless steels
shall be in the Solution Annealed condition
4123 Austenitic stainless steel bellows diaphragms Bourdon tubes and other
stainless steel items which cannot be heat treated following welding or
cold forming are not acceptable Alternative materials are Incoloy 825
Incoloy 925 Inconel 625 Monel 400 and Monel K500
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
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413 Internal Bolting
4131 Internal bolting shall comply with the NACE Standard requirements
when in contact with any concentration of wet H2S (see also para 415 of
this Specification)
4132 Where austenitic stainless steel bolts and nuts are required these itemsshall be free from cold work they shall be solution treated after thread
rolling etc as outlined below-
a Bolts shall be Class lA of ASTM A 193eg B8MA (Type 316)
bolts solution treated after all cold work including thread rolling
b Nuts shall be the A suffix variety of ASTM A 194 eg Grade
8MA (Type 316) solution treated after all hot or cold working
414 External Bolting
4141 Carbon or low alloy steel bolting shall be phosphate treated and PTFE
coated in accordance with ADMA-OPCO Specification SP 1015
Where the use of PTFE coated bolting is impractical zinc plated
bolting in accordance with ASTM B633 or equivalent is acceptable
4142 Due to environmentally induced stress corrosion cracking problems
standard austenitic stainless steel bolting is not acceptable for pressure
containment purposes Alternative high nickel stainless steels or duplex
stainless steels such as Carpenter 20Cb-3 Farralum 255 or PTFE
coated bolting as 4141 above is acceptable
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
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415 Bellows
4151 Bellows units shall comply with the NACE Standard requirement when
in contact with any concentration of wet H2S (see also para 415) of
this specification
4152 Austentic stainless steels shall not be used for bellows but materialselection may be made according to the process conditions from the
following-
- Incoloy 825
- Inconel 625
- Monel 400
Other materials may be proposed for approval by ADMA-OPCOQAD
The production procedure shall comply with the requirements of the
NACE Standard
416 Metallic Overlays
Explosively clad roll bonded and fusion-bonded corrosion resistant overlays
such as austenitic stainless steels and nickel base alloy are considered to be
effective barriers to the sulphide environment Where such overlays are
employed the backing material need not conform to this Specification unless
otherwise specified by ADMA-OPCOQAD
5 WELDING AND FABRICATION
The following requirements related to welding and fabrication and heat treatment shall
apply in addition to the requirements of the NACE Standard
51 Approval of Heat-Treatment Procedure
Pre and post weld heat treatment shall generally be in accordance with
ADMA-OPCO SP-1035 and the requirements hereinafter unless otherwise
specified by ADMA-OPCOQAD For equipment which is to be post-weld heat
treated the following information shall be submitted to ADMA-OPCOQAD for
approval
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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511 Details of the method of heating eg furnace electric resistance
induction etc
512 Details of the position of thermocouples
513 Special requirements for heat-treatment eg if it were proposed to
post-weld heat treat a heat-exchanger tube bundle incorporating tubeend welding
514 Copies of relevant heat treatment charts on completion
52 Small Bore Carbon Steel Pipework r less than DN75 mm (3 inch) NPS]
The TIG welding process shall be used for the butt welding of small bore
carbon steel pipework unless otherwise specified by ADMA-OPCOQAD
53 Possible Avoidance of Post-Weld Heat Treatment
To avoid the need for PWHT on the major part of a piping system the
following requirements shall be met-
531 Standard welding procedures for all pipework shall provide for a
minimum of two passes
532 The use of double sided welding on larger diameter pipe internal
sealing runs to correct bore misalignment local internal repairs the use
of fittings requiring back welding etc will all result in untempered
weld beads on the process side In such cases the contractor or
supplier shall either submit his proposals for ADMA-OPCOQAD
approval together with the test data to show that the specified
hardness limits have been met or shall PWHT the welds concerned and
prove this to ADMA-OPCOQAD
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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533 Avoidance of PWHT will not be permitted on pipework with wall
thicknesses greater than 19 mm (0750 in) without the required
dispensation by ADMA-OPCOQAD
534 Repair to root runs are not permitted after subsequent runs have been
made unless the joint is subjected to PWHT or a simulated weld repair
procedure has been qualified
54 Welding Procedure Qualification Tests
541 Prior to the commencement of work the fabricator or supplier shall
submit to ADMA-OPCOQAD his proposals for evaluating the
welding procedures as per ADMA-OPCO STD-101 and in particular
those related to the control of hardness
542 In the case of equipment which is to be post-weld heat treated the
welding procedure tests shall incorporate a hardness survey as specifiedin para 545 of this Specification
543 In the case of as welded equipment the fabricator or supplier shall
submit to ADMA-OPCOQAD for approval the proposed method of
meeting the hardness limits of typical butt welds internal sealing runs
branch welds and local repair etc
544 On receipt of approval of the proposals the fabricatorsupplier
contractor shall carry out the required test welds and hardness surveys
The hardness surveys shall be carried out on agreed samples cut from
approved procedure test coupons
545 Test coupons shall be ground smooth and macro etched to reveal the
various zones of the weld Hardness traverses shall be made at a
distance of 2 mm (0079 in) from the inner and outer surfaces of the
weld joint using the Vickers hardness test method with a load of 10 kg
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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The hardness traverse shall include the parent metals weld weld heat
affected zones on both sides of the joints and the positions of the
indentations shall be selected to establish peak hardness values The
maximum permitted hardness shall be 248 HV10 Kg (HRC22)
546 The results of the tests shall be submitted to ADMA-OPCOQAD
or an approved independent inspectorate for acceptance
6 IDENTIFICATION STAMPING AND MARKING
61 Hard Stamps
Conventional sharp V stamping is acceptable only on the outer
circumferences of flanges Round U stamps may be used elsewhere
providing the identities are placed on the external surfaces of low stress areas
Where stamps have been inadvertently applied to high stress areas subsequent
heat treatment is required unless approved otherwise by ADMA-OPCOQAD
62 Marking
Conventional paints crayons and adhesive tapes frequently used for temporary
marking during fabrication etc shall not be used on any stainless steel and if
used on carbon or low alloy steels they shall be removed before heat treatment
(if applied) and before shipment if heat treatment is not required
7 INSPECTION
In addition to normal inspection the following shall apply
71 Documentation shall be provided to prove the identity of all material of
construction and to establish that the correct heat treatment has been applied
so that the finished product complies fully with this Specification
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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72 The Manufacturer shall conduct hardness tests to ensure that the hardness
requirements of this Specification are met and these should be certified
approved as indicated in para 546 Where hardness values in excess of the
requirements of this Specification and the NACE Standard are obtained the
part shall be rejected
73 Except in the case of austenitic stainless steels for small items eg smallsprings pins etc which can not be hardness tested individually the
manufacturer shall conduct tests on a random basis by selecting components
from production runs or stores batches to ensure that the product complies
fully with this Specification
74 For austenitic stainless steels the manufacturer shall certify that the specified
heat treatment has been carried out correctly
75 Details of components materials and the material condition shall be subject to
ADMA-OPCOQAD approval prior to manufacture
8 EXTERNAL PROTECTION-STAINLESS STEELS
Stainless steels shall be protected externally before transporting to site as per ADMA-
OPCO SP-1002 requirements The protection shall be maintained during construction
and operation at site Protection of welds and associated heat affected zones is most
important Any painting specification used in the context of this section shall be in
accordance with ADMA-OPCOQAD Specification SP-1020 PSN 530 or approved
alternative
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
1 10-92 GENERAL REVISION
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
1 10-92 GENERAL REVISION
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
1 10-92 GENERAL REVISION
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
1 10-92 GENERAL REVISION
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SHEET
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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Rev Date Description Text Affected
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TO CONTENTS
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APPENDIX A
PREVENTION OF STRESS CORROSION CRACKING
IN SOUR SERVICE WITH CHLORIDES
REQUIREMENTS FOR AUSTENITIC STAINLESS STEELS
Al Austenitic stainless steels shall be in the solution annealed condition
A2 Bends in pipework and tubing and other cold formed items shall be solution annealed
at 1050 C (1920 F) or stress relieved at 950 + 20 C (1740 + 68 F) after forming
A3 Austenitic stainless steels are not acceptable for bellows or other components in the
cold worked or highly stressed condition note that NACE Standard prohibits the use
of cold worked austentic stainless steels Incoloy 825 is an acceptable material among
others for this duty
A4 For welded equipment stabilised or low carbon grades shall be used and unless
otherwise approved by ADMA-OPCOQAD all welded items shall be either solution
annealed at 1050 C (1920 F) or stress relieved at 950 + 20 C (1742 + 68 F)
A5 Because of the significantly greater risk of crevice corrosion in sourchloride service
the use of socket welded fittings or any other weld detail which could result in a
crevice on the process side is not permitted
A6 Fusion-bonded overlays of Stellite or Colmonoy may be applied to stabilised or low
carbon grades of austenitic stainless steels provided that the component is
subsequently stress relieved at 950 + 20 C (1742+68 F) held for 1 hour per 25mm
(1 in) of thickness and cooled in still air
1 10-92 GENERAL REVISION
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SHEET
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
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SHEET
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
1 10-92 GENERAL REVISION
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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APPENDIX B
PREVENTION OF STRESS CORROSION CRACKING IN SOUR SERVICE WITH
CAUSTIC OR OTHER ALKALINE PROCESS FLUIDS
Bl General Requirements for Carbon Steel Equipment
B11 Carbon steel is generally an acceptable material for handling certain caustic
soda and other alkaline solutions However it has limitations in that stress
corrosion cracking can occur unless the equipment is stress relieved also
unacceptable general corrosion can take place at elevated temperatures
B12 The stress relief requirements and upper temperature limits as given in Figure
B-l shall be applied for carbon steel vessels and pipework in caustic soda and
other alkaline service Stress relief shall be applied to the whole vessel and to
welds cold bends etc in the case of pipework
B13 Where the caustic soda or other alkaline solution is at a temperature in excess
of that shown in Area B (Figure B-1) material selection shall be subject to
approval by ADMA-OPCOQAD
B14 Figure B-1 shall apply to vessels and pipework only material selection for
other equipment eg pumps shall be subject to approval by ADMA-OPCO
QAD
B2 Sour Streams Containing Amines
B21 To avoid stress corrosion cracking of carbon steel welds exposed to DEA
solutions used in hydrogen sulphide sweetening plants stress relieving of all
welds is required
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
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SHEET
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
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Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
1 10-92 GENERAL REVISION
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
1 10-92 GENERAL REVISION
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
1 10-92 GENERAL REVISION
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SHEET
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
1 10-92 GENERAL REVISION
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SHEET
31 OF 33
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
32 OF 33
TO CONTENTS
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ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
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APPENDIX C
SPECIFICATION FOR STEEL PLATE (Z QUALITY)
Cl Scope
This specification defines requirements for the manufacture and supply of steel plateswith enhanced through-thickness properties for special applications
C2 Definition
Steel with enhanced through-thickness properties ie Z direction properties are
conventionally referred to as Z quality steels and the suffix Z may be affixed to the
steel specification designation
eg BS1501 224-161 Grade 360-Z
BS 4360 Grade 50D-Z
This signifies that the material has been produced by special steel making and rolling
procedures and has been subject to ultrasonic and mechanical tests in the through
thickness or Z direction
Some steel mills use the suffixes Z15 Z25 and Z35 as specified in ISO 7778 to signify
that Z direction reduction of area average values of 15 25 or 35 have been met
ADMA-OPCO requirement is for Z direction reduction of 30 minimum for which the
suffix Z30 shall be used for ADMA-OPCO materials
C3 Material
C31 Standards
The plate furnished by the supplier shall meet the requirements of the specified
grade of material designated in the Purchase Order together with the following
supplementary requirements
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
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a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
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SHEET
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C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
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C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
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TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
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Rev Date Description Text Affected
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SHEET
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APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
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SHEET
31 OF 33
TO CONTENTS
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APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
32 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3434
ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 2834
a Process of Manufacture
Steels shall be made by a low sulphur and low phosphorus refining
process for example in an electric furnace with double deslagging or
in the basic oxygen furnace (BOF) The steel shall be vacuum degassed
while molten by means of a ADMA-OPCOQAD approved process
b Chemical Composition
The following supplementary requirements shall apply
Element Check Analysis
Carbon 020 Max
Sulphur 0005 Max
Phosphorus 0025 Max
Carbon Equivalent 042 Max
The carbon equivalent values used in the above Table shall be calculated
by means of the following formula
CE = C + Mn + Cr+Mo+V + Ni+Cu
6 5 15
C4 Inspection Requirements for Plate
C41 Ultrasonic Examination
Material supplied in accordance with this specification shall be ultrasonically
tested in accordance with the requirements of BS 5996 - Grade LC3 or an
equivalent approved by ADMA-OPCOQAD
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
27 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 2934
C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
28 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3034
C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
29 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3134
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
30 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3234
APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
31 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3334
APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
32 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3434
ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 2934
C42 Through-Thickness Tensile Test
At the commencement of production and subsequently unless approved
otherwise by ADMA-OPCOQAD six through-thickness tensile tests shall be
conducted at the locations shown on Figure C-l of each plate as rolled For
plates over 30mm (118 in) thick the specimens shall have an extension
friction welded to one surface as shown in Figure C-2 which also shows thedisposition of the specimen relative to the plate thickness and the size of
specimen For thinner plates full thickness specimens with two friction
welded end pieces shall be used
Plate as rolled means a plate rolled from one slab
The following minimum requirements shall be achieved
Reduction of Area (Z direction) 30 minimum
Elongation on 354 D 18 minimum
The through-thickness test shall be made after the completion of all heat
treatments
In addition to the above all the necessary tests required by the relevant
material specification shall be carried out
C5 Weld Repair of Plate
Weld repair of plate surface defects will not be permitted without ADMA-OPCOQAD
approval and shall be subject to an agreed repair procedure prior to the work being
carried out
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
28 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3034
C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
29 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3134
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
30 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3234
APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
31 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3334
APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
32 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3434
ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3034
C51 The Extent of Defects that may be Repaired
a Depths of Defects
After complete removal of the defects the remaining thickness shall be
checked to ensure that the depth of defect does not exceed l0mm
(039 in) or 20 of the nominal thickness of the plate whichever is thesmaller Plate with defects in excess of the above depth shall be
rejected
b Area of Defects
On any one surface of a plate the total repaired area shall not exceed
2 of the total area of that surface
C52 Heat-Treatment after Welding Repair
All plates subjected to welding repair shall be stress relieved after welding if the
plates are supplied in the normalised condition
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
29 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3134
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
30 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3234
APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
31 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3334
APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
32 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3434
ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3134
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
30 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3234
APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
31 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3334
APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
32 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3434
ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3234
APPENDIX D
ABBREVIATIONS
ADIP Di-Isopropanolamine
API American Petroleum Institute
ASTM American Society for Testing and MaterialsBS British Standard
CE Carbon Equivalent
DEA Di-Ethylamine
EEMUA The Engineering Equipment and Materials Users Association
EFW Electric Fusion Welded
ERW Electric Resistance Welded
HIC Hydrogen Induced Cracking
HV Vickers Hardness
HRC Rockwell Hardness Scale C
MEA Mono-Ethanolamlne NACE National Association of Corrosion Engineers
NPS Nominal Pipe Size
PTFE Polytetrafluoroethylene
PWHT Post Weld Heat Treatment
SSC Sulphide Stess Cracking
SCC Stress Corrosion Cracking
TEMA Tubular Exchanger Manufacturers Association
TIG Tugsten Inert Gas
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
31 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3334
APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
32 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3434
ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3334
APPENDIX E
LIST OF REFERENCE STANDARDS
The latest edition or revision of the following Codes shall to the extent specified herein
represent a part of this Specification
ANSI
B313 Chemical Plant and Petroleum Refinery Piping
API
STD 610 Centrifugal Pumps for General Refinery Services
STD 617 Centrifugal Compressors for General Refinery Services
ASTM
ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure and HighTemperature Service
ASTM A395 Ferritic Ductile Iron Pressure - Retaining Castings for Use at Elevated
Temperatures
ASTM B633 Electro deposited coatings of Zinc on Iron and Steel
BSI
BS 1501 Steel for Fired and Unfired Pressure Vessels
BS 3468 Austenitic Cast Iron
BS 4360 Weldable Structural Steels
BS 5996 Methods for Ultrasonic Testing and Specifying Quality Grades for
Ferritic Steel Plate
ISO
ISO 7778 Steel Plate with Specified through Thickness Characteristic
NACE
MR0175 Material Requirement - Sulphide Stress Cracking Resistant Metallic Material
for Oil Field Equipment
TM0284 Test Method Evaluation or Pipeline Steels for Resistance to Stepwise Cracking
TM0177 Testing of Metals for Resistance to Sulphide Stress Cracking at Ambient
Temperatures
TEMA Tubular Exchanger Manufacturers Association
EEMUA
PUB 143 Recommendations for Tube End Welding amp Tubular Heat Transfer Equipment
Part - 1 Ferrious Materials
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
ADMA-OPCO SP - 1000
SHEET
32 OF 33
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3434
ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS
7232019 SP_1000 Materials for Sour Servicepdf
httpslidepdfcomreaderfullsp1000-materials-for-sour-servicepdf 3434
ADMA-OPCO
STD-101 Approval of Welding Procedure Specifications
STD-122 Casing Tubing and Drill Pipe
STD-123 Casing Hardware Downhole Completion and Wireline Equipment for
Sour
STD 124 Part 1 amp 2 Alloy 825 Casing Tubing and Couplings
STD-125 Part 1 amp 2 Wellhead and Christmas Tree Equipment to API Spec 6ASP-1002 Preservation of New Materials amp Equipment
SP-1011 Specification for Line Pipe Part 1 2 amp 3
SP-1015 Specification for PTFE Bolting
SP-1020 General Specification for Protective Painting
SP-1035 Specification for Pre amp Post Weld Heat Treatment of Metals
JNDMKMlr4938n
1 10-92 GENERAL REVISION
Rev Date Description Text Affected
SP 1000SHEET
TO CONTENTS