ATTACHMENT–X: Tender no. 14000003-HD-48009 TECHNICAL DETAILS FOR PROCUREMENT OF HEAT EXCHANGERS Page 1 NOTE: DEVIATIONS, IF ANY, SHALL BE MADE ONLY WITH RESPECT TO THE FOLLOWING SPECIFICATIONS AND SHALL CLEARLY HIGHLIGHT THE SAME BY INDICATING APPROPRIATE CLAUSE REFERRED IN THIS DCOUMENT. NO OTHER CONSIDERATIONS/ELABORATIONS SHALL BE ENTERTAINED. 1.0 BRIEF SCOPE OF SUPPLY & WORK 1.1 This document covers the requirements for unfired Shell and Tube type Heat Exchanger’s design, supply of materials, including internals parts, nozzles, etc. preparation & obtaining approval of design calculations, development of fabrication drawings, fabrication, inspection, testing, cleaning, painting, workmanship, guarantee, packing and forwarding, along with spares and documentation, as applicable, duly complete in all respects and ready to install and use. 1.2 Intent of this document is to supplement, amend or limit the reference codes &standards mentioned herein. 1.3 Exceptions or variations shown in the job specifications take precedence over requirements shown herein. 1.4 No variations from the job specifications and this specification are permitted unless specified by the Supplier and approved in writing by HPCL. 1.5 In case of any conflict between the various specifications and codes, the matter shall be referred to HPCL for clarifications and the clarifications provided by HPCL shall be final and binding on the Supplier. 1.6 Preparations for shipment & transportation of the Equipment to HPCL, Mumbai Refinery, are inclusive. Supplier to provide necessary manpower and suitable lifting devices like Winch, Hoist, Sling, etc. as required for unloading of the equipment at Refinery. Only Crane/Fork-lift arrangement will be provided by HPCL at unloading site, as per Equipment load requirement. Such service shall be free of any charge. However, Supplier shall inform HPCL about the requirement in advance, at least 5 days prior to scheduled receipt of the Equipment at site location. 2.0 REFERENCES – DESIGN CODES The following codes in their latest edition, including addenda, as applicable at the time of bidding shall form the basis for design, fabrication, inspection, testing and acceptance of Equipment. Wherever code is applicable for the enclosed Exchanger data sheet,the same shall be considered from the following list. 2.1 TEMA standard, Class ‘R’ or as specified in drawing/data sheet 2.2 Relevant ASTM specifications 2.3 ASME Boiler and Pressure Vessel Code, Section-VIII, Division 1/2; Section-II, Part A/B/C/D; Section- V; and Section-IX 2.4 AWS-ASME specifications for Welding Electrodes 2.5 ANSI B-16.5, Steel Pipe Flanges and Flanged Fittings and B-16.11, Forged Steel Fittings, Socket weld and threaded (latest editions) 2.6 National, State and local laws and codes such as Indian Boiler Regulations (IBR), etc. 2.7 Expansion Joint Manufacturers Association (EJMA) standards 3.0 DESIGN 3.1 General Requirements 3.1.1 Materials are specified in the job specifications in general terms. Required materials shall conform or be equal to the ASME specifications given in TEMA. Cast Iron shall be not be used.
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ATTACHMENT–X: Tender no. 14000003-HD-48009
TECHNICAL DETAILS FOR PROCUREMENT OF HEAT EXCHANGERS
Page 1
NOTE: DEVIATIONS, IF ANY, SHALL BE MADE ONLY WITH RESPECT TO THE FOLLOWING SPECIFICATIONS
AND SHALL CLEARLY HIGHLIGHT THE SAME BY INDICATING APPROPRIATE CLAUSE REFERRED IN
THIS DCOUMENT. NO OTHER CONSIDERATIONS/ELABORATIONS SHALL BE ENTERTAINED.
1.0 BRIEF SCOPE OF SUPPLY & WORK
1.1 This document covers the requirements for unfired Shell and Tube type Heat Exchanger’s design,
supply of materials, including internals parts, nozzles, etc. preparation & obtaining approval of
design calculations, development of fabrication drawings, fabrication, inspection, testing, cleaning,
painting, workmanship, guarantee, packing and forwarding, along with spares and documentation,
as applicable, duly complete in all respects and ready to install and use.
1.2 Intent of this document is to supplement, amend or limit the reference codes &standards
mentioned herein.
1.3 Exceptions or variations shown in the job specifications take precedence over requirements shown
herein.
1.4 No variations from the job specifications and this specification are permitted unless specified by
the Supplier and approved in writing by HPCL.
1.5 In case of any conflict between the various specifications and codes, the matter shall be referred to
HPCL for clarifications and the clarifications provided by HPCL shall be final and binding on the
Supplier.
1.6 Preparations for shipment & transportation of the Equipment to HPCL, Mumbai Refinery, are
inclusive. Supplier to provide necessary manpower and suitable lifting devices like Winch, Hoist,
Sling, etc. as required for unloading of the equipment at Refinery. Only Crane/Fork-lift arrangement
will be provided by HPCL at unloading site, as per Equipment load requirement. Such service shall
be free of any charge. However, Supplier shall inform HPCL about the requirement in advance, at
least 5 days prior to scheduled receipt of the Equipment at site location.
2.0 REFERENCES – DESIGN CODES
The following codes in their latest edition, including addenda, as applicable at the time of bidding shall
form the basis for design, fabrication, inspection, testing and acceptance of Equipment. Wherever code is
applicable for the enclosed Exchanger data sheet,the same shall be considered from the following list.
2.1 TEMA standard, Class ‘R’ or as specified in drawing/data sheet
2.2 Relevant ASTM specifications
2.3 ASME Boiler and Pressure Vessel Code, Section-VIII, Division 1/2; Section-II, Part A/B/C/D; Section-
V; and Section-IX
2.4 AWS-ASME specifications for Welding Electrodes
2.5 ANSI B-16.5, Steel Pipe Flanges and Flanged Fittings and B-16.11, Forged Steel Fittings, Socket weld
and threaded (latest editions)
2.6 National, State and local laws and codes such as Indian Boiler Regulations (IBR), etc.
2.7 Expansion Joint Manufacturers Association (EJMA) standards
3.0 DESIGN
3.1 General Requirements
3.1.1 Materials are specified in the job specifications in general terms. Required materials shall conform
or be equal to the ASME specifications given in TEMA. Cast Iron shall be not be used.
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3.1.2 Designer of Exchanger unit shall be responsible for furnishing Equipment that is free of over-
stressing for any loading within the specified maximum loading.
3.1.3 For Heat Exchangers falling under the purview of Indian Boiler Regulations (IBR), in addition to the
requirements specified in the specification, the Exchanger shall be designed, fabricated, inspected
and tested in accordance with the requirements of IBR. Approval of CIB of the State in which the
equipment is being manufactured as well as the State where the equipment is being installed (i.e.
Maharashtra State) shall be the responsibility of the Equipment Supplier at no extra cost.
3.1.4 Supplier shall check, as part of his responsibility, any design information issued by HPCL. Any
comment and/or reservations shall be stated at the bidding stage itself. Modifications and/or
variations which may prove necessary during the fabrication phase for ensuring full reliability and
efficiency of the Equipment and/or adjusting the design to suit the job/Equipment specification,
design codes, local regulations or to suit technical and fabrication facilities of the Supplier, shall be
responsibility and liability of the Supplier and shall in all cases be submitted in writing for
consideration & approval by HPCL.
3.1.5 Supplier shall obtain necessary approvals and have the required testing carried out by legally
qualified Organization such as CIB and also by the Inspection authorities, if any, specified by
HPCL.Unless expressly stated otherwise in the job specification or in the Purchase Order, Shell and
Tube Heat Exchangers shall be designed and made in accordance with the references (latest
editions) as specified above.
3.1.6 During design of Fixed Tube Sheet Heat Exchangers, considerations must be given to the stresses
induced at operating, alternate operating, start-up, shutdown and other upset conditions. Where
necessary, expansion joints shall be provided.
3.1.7 In general, Tube to Tube Sheet joints shall be expanded. All Tube Sheet holes and grooving in them
shall conform to TEMA and the following supplements. Grooves shall be squared, edged and
concentric. When heat treatment of Tube Sheet is required, final Tube hole sizing shall be attained
by reaming after heat treatment. Refer specification by reaming after heat treatment. Refer
Specification no. 6-15-04 for ‘Expanded Tube to Tube Sheet joints’.
3.1.8 Tube to Tube Sheet joints shall be welded for following cases:
a) Design temperature is <0oC or >350
oC.
b) Design pressure exceeding 50 kg/cm2g for all type of Exchangers.
c) When there is cladding on the Tube side face of the Tube Sheet, Channel side, Floating Head
side.
d) Where high reliability of the joints is required because of lethal substance, product quality,
hazards of inter-mixing, etc.
3.1.9 Where stated, Tube Bundles may be designed for the differential pressure given in job
specifications. Supplier shall provide visible Warning Plate adjacent to or part of Name Plate,
outlining test pressure regulations, when differential design is used.
3.1.10 Tube Sheets, for economic or other justifiable reason, may be clad or faced type.
3.1.11 Use extended, bolted type Tube Sheet for U-Tubes and stab in Bundles.
3.1.12 In case of Fixed Tube Sheet Exchangers, only thick Flexible Expansion Joint designed as per TEMA
shall be used. These shall be suitable for 500 start-up/shut down cycles and 5000 operating cycles.
At other places, light gauge Bellow type Expansion Joints as per EJMA may be used. These shall be
designed for 2000 start-up/shut down cycles and 7500 operating cycles.
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The following shall also be complied with:
i) All CS Bellows/Joints (if hot formed) shall be normalized if not formed in normalizing range.
Cold formed bellows/joints shall be solution annealed.Supplier shall submit procedure for
approval.
ii) All welds shall be 100% radiographed.
iii) For SS Bellows/Joints, only low carbon stabilized grade of Steel shall be used.
iv) Supplier shall submit design calculations with details and fabrication procedure for approval.
v) All Expansion Joints/Bellows shall be provided with internal sleeve and shall have suitable
vending/draining provision.
vi) Material of Expansion Joint, Sleeve, transition piece, etc. shall be the same as that of the
Shell.
3.1.13 All Low Alloy Steel materials (C-Mo, Cr-Mo Steel groups, P3 onwards) shall meet the hardness
limitations as per Para 2.4.1 (b) on base metal, weld metal and heat affected zone.
3.1.14 Minimum Design Metal Temperature (MDMT) shall be taken as lower of 0oC or the design
temperature unless lower MDMT is specified elsewhere. The requirement shall be comply with all
the code/specification requirement for MDMT such as impact tested, heat treatment, radiography,
etc.
3.2 Vents, Drains and Other Connections
3.2.1 When Tube side fluid is Steam, a 40NB (flanged) operatingvent connection shall be provided in the
Channel Cover or Bonnet Head at high point of second pass.
3.2.2 When Shell side fluid is Steam, 40NB (flanged) Shell side operating vent connections shall be
provided as follows:
a) Horizontal units: One vent, located below centerline at the end opposite to the inlet.
b) Vertical units: Two vents required; one below horizontal centerline at the end of steam
travel and one near the top.
3.2.3 For total condensing service, provide a flanged 40 NB vent nozzle on top of Shell at end opposite to
Shell inlet. For stacked units, provide a vent nozzle in each Shell. Rating, Flange facing, etc. shall be
equal to that provided for main Shell side nozzles.
3.2.4 Provide multi-purpose (MP) connections for Pressure Gauge/Temperature Indicator/in-line
hydrotest/chemical cleaning, etc. These connections shall be 40 NB flanged with BF for nozzle size
100 NB and above. For 80 NB nozzles, the MP connection shall be 1˝, 6000# class,Socket welded
with Plug. For 50 NB nozzles, the MP connection shall be ¾˝, 6000# class,Socket welded with Plug.
Provide one connection each on one inlet and one outlet nozzle on each side of Heat Exchanger. In
addition, provide vent/drain connection 40NB, Flanges with BF on each side of the Exchanger if
Exchanger cannot be vented/drained through MP connections.
3.2.5 All flanges shall be of weld neck type.
3.2.6 Integral reinforced nozzles are required if any of the following conditions is applicable:
a) Design pressure exceeds 50 kg/cm2g
b) Design temperature is <0oC or >350
oC
c) Plate thickness exceeds 50mm or there is a limitation on 1st
and the last Baffle spacing
3.2.7 All connection shall be flanged, unless specified otherwise. Minimum nozzle size shall be 40 NB.
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3.2.8 Nozzles shall be designed for external loading from connected piping. For Equipment where piping
analysis is not in Supplier’s scope, loading on nozzles shall be considered in design as 100 kg-m per
inch-dia of nozzle (moment) and 100 kg per inch-dia of nozzle (force) in each of the three
directions.
3.2.9 For other special applications such as Kettle Re-boilers, Kettle Steam Generators, Slurry handling,
HF Acid service, Hydrogen service, etc., applicable special constructional features shall be indicated
in the bid.
3.2.10 For HXS with design temperature below 0oC, all requirements of code applicable for equipment
below (–29oC) such as impact testing, heat treatment, full radiography, etc. shall be complied with.
3.2.11 All nozzles 50 mm and below shall be provided with two numbers Gussets @ 90o apart.
4.0 MATERIALS
4.1 Tubing
4.1.1 All Tubes shall be seamless and cold drawn.
4.1.2 Tube gauge/thickness specified is the required minimum wall thickness unless otherwise specified.
Generally, Tube thickness shall be as under:
CS/LAS 20 OD x 2 (min)
25 OD x 2.5 (min)
SS/HAS/ADMIRALITY 20 OD x 1.6 (min)
25 OD x 2 (min)
4.1.3 For U-Tubes, the wall thickness specified is applied to the tubing before bending. All U-Tubes shall
be formed from a continuous length of tubing, free of girth welds.
4.1.4 The minimum mean radius of U-bends shall be 2 times the OD of the Tube. Flattening at the bends
shall not exceed 10%nominal OD of straight portion Tube. Proposal may be based on the use of
heavier wall tubing for short radius U-bends when design pressure demands thicker Tube walls.
4.1.5 Tubing shall be in the fully heat treated conditions as received from the mill. Heat treatment shall
be annealed for CS & SS Tubes. Copper alloy Tubes shall be supplied in the annealed tempered
condition.
4.1.6 CS U-Tubes shall be stress relieved for the U-bend radii upto 5 times the tube diameter.
4.1.7 SS U-Tubes shall be solution annealed.
4.1.8 Product analysis of Tubes shall be carried out and reported.
4.1.9 All Tubes shall be hydrotested. In additional to hydrostatic test, each Tube of Copper and Copper
Alloy shall be Eddy Current tested as per Practice E-243 “Recommended Practice for Electro-
magnetic (Eddy Current) testing of Seamless Copper and Copper Alloy Tubes”. Eddy Current testing
shall be done in the final annealed condition.
4.2 Bolting and Flange closures
4.2.1 Supplier of the Exchanger unit shall guarantee tightness compatibility of their closure designs. This
especially pertains to closures where designer amalgamated components having different thermal
expansion properties.Stud Bolts with hexagonal Nuts shall generally conform to ASTM A193 Gr.B7
and ASTM A194 Gr.2H respectively, unless specifically mentioned in the drawings/specifications or
where the operating conditions prevent use of such materials. Stud Bolts shallbe fully
threaded.Bolt length specified is theeffective thread length. Rounded or chamfered endjoints shall
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not be included when measuring length of Bolts. The test temperature for impact testing of all
Gr.L7 Bolts and Gr.4 Nuts per ASTM A320 shall be –120oF. Nuts conforming to ASTM A194 Gr.2,
Gr.2H and Gr.4 in sizes greater than ½˝shall not be machined from bar stock. Nuts conforming to
ASTM A194 Gr.4 insizes smaller than ½˝shall not be machined from cold finished bar stock. Bolts
conforming to ASTM A320 Gr.B8 shall be strain hardened.
4.2.2 For Floating Head Flanges, low hardness bolting such as SA193 Gr.B7M, SA 320 Gr.L7M, etc. shall
be used.
4.3 Gaskets
4.3.1 CAF Gaskets: CAF grade shall be selected by the Supplier, if suitable for the process fluid. Gasket
contact face shall be machined and provided with spiral orconcentric groove finish.
4.3.2 Metal jacketed Gaskets: Gaskets shall be double jacketed enclosed by two seams with Asbestos
orsuitable filling, shall have minimum total thickness of 3 mm beforecompression, with jacket
thickness of 0.4 mm (min).Jacket material shall be same as HE material except for Carbon Steel
vessel, where Jacket shall be of SS304material. Gasket contact face shall be provided with
smooth finish.
4.3.3 Spiral wound Gaskets:Metallic spirals with Asbestos or Graphite/PTFE filled Gaskets shall have
minimum total thickness of 4 mm. Each Gasket shall be provided with internal compression and
external guidering, when not available integral in flange.
4.3.4 Gaskets shall conform to the following standards:
Gasket type Standards
Compressed Asbestos 1/16˝ thick flat ring shape, dimensions as per ANSI B16.21
Double jacketed API 601 for Corrugated Jackets
Spiral wound API 601
Ring joint ANSI B16.20 (oval shape)
4.3.5 Compressed Asbestos Gaskets shall have an anti-stickrelease agent or be graphited on both sides
and havea minimum tensile strength of 200 psi across thegrain.
4.3.6 The grade of Asbestos and binders for impregnates used shall be suitable for service fluid
temperature.
4.3.7 The metal windings of Spiral wound Gaskets shall beof 18-Cr 8-Ni unless other special material
arerequired by the processfluid. For operatingtemperatures below –50oF, the centering ring shall
also be 18-Cr 8-Ni.
4.3.8 For Ring Gaskets, hardness of the Ring shall be lower than that of the Flange. Where it may
notbepossible to obtain this feature, as in the case ofvarious Alloys, selection of appropriate
material shall be resolved with HPCL.
4.3.9 Manufacturer shall furnish Gaskets forintermediate Flanges between multiple Shells, direct
connected Exchangers.
4.3.10 Copper Gaskets are not permitted when fluids contain H2S or Amines.
4.3.11 Hardness of the metal for solid or clad Gasket is not to exceed the following values:
i) Iron, Copper, Brass or other soft metals: maximum 80 Brinell
ii) SS, Monel or other hard Alloys: Brinell number as low as possible and to be minimum 15
Brinell lower than for the material of the Flange Gasket facing.
4.3.12 All Gaskets shall be made in one continuous piece all around including the pass ribs and therefore
must be cut from one sheet.
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4.4 Plates
4.4.1 Carbon content of CS Boiler quality Plates shall not exceed 0.25%.
4.4.2 CSPlates to specification SA516 shall be in the normalized condition.
4.4.3 Plates having thickness 16to 50mm (both inclusive) shall be examined ultrasonically as per
ASTMA435.
4.4.4 For Plate thicknesses above 50mm, ultrasonic examination shall be carried out as per ASTMA578
and shall have acceptance standard of Level-B. Ultrasonic examination shall be done after the
specified heat treatment of Plates.
4.4.5 CS Boiler quality Plates/LASPlates above 50mm thickness shall meet the following additional
requirements:
i) Vacuum treatment as per the supplementary requirement S1 of SA 20.
ii) Charpy V-notch test as per the supplementary requirements S5 of SA20 test temperature:
Minus 26oC or lower as specified in SA 20/individual materials.
iii) Acceptance criteria: As per Table-A2.15 of SA 20.
Orientation of Test Bar: Transverse to the direction of rolling.
For material SA515 Gr.60, values for SA516 Gr.60 shall be taken.
iv) Bend test as per the supplementary requirement S14 of specification SA 20.
4.4.6 All SS Plates shall be hot rolled,annealed and pickled and shall have no.1 finish on both sides with
reference to SA480.
4.4.7 Plates representative of each heat shall be inter-granular corrosion tested as per ASTM A262
Practice E for all 300 series SS materials.
4.5 Forgings
4.5.1 Flanges shall be forged weld neck type.
4.5.2 All pressure forging for CS and LAS shall be in normalized and tempered condition.
4.5.3 Carbon content of CS Forging shall not exceed 0.25%.
4.5.4 CS Forgings above 75mm – all TubeSheet Forgings and all Forgings of other materials shall be 100%
ultrasonically tested as per ASTM A388. Acceptance standards shall be asper AM 203.2of ASME
Section-VIII Division II.
4.6 Pipes
4.6.1 All Pipes shall be seamless. Pipe sizes above 1½˝ NB shall be hot finished.
4.6.2 Dimensions & tolerances shall be in accordance with ASME B36.10 or 36.19, as applicable.
4.6.3 Carbon content of CS Pipes shall not exceed 0.25%.
4.6.4 All LAS Pipes shall be procured in normalized &tempered condition.
4.7 Cladding
4.7.1 Use of clad materials for economical and other reasons may be considered.
a) Cladding shall be integrally and continuously bonded to the base metal.
b) Cladding shall not be counted for the strength it adds to TubeSheet/other pressure parts.
c) When other parts in contact with the same fluid are specified as ‘Killed Steel’, base metal of the
clad or faced Tube Sheet/other pressure parts shall also be Killed Steel.
d) Bond between cladding and base metal shall be checked for a minimum strength 14kgf/mm2 in
shear by conducting Shear Test.
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e) Clad Plates shall be ultrasonically examined from the clad surface in accordance with the
requirements of ASTM A578. Scanning shall be 100% of the Plate surface. Acceptance standards
shall be Level-B.
f) Clad Plates to meet the supplementary requirements S-7 of ASTM A578.
4.7.2 Materials for low temperature service:
a) All LTCS/CS Charpy material shall be fine grain practice. CS CharpyPlates shall be in normalized
condition.
b) All LTCS/LASmaterials shall be impact tested as per material specification. The impact li
temperature shall be lower of the minimum design. Metal temperature or test temperature
shall be as per ASME Section-II. The impact energy values shall be per ASME Section-III Division
I/Section-II, whichever is higher unless specified otherwise.
c) LTCS Forgings for all Flanges shall be to SA350 Gr.LF2.
4.8 SS Materials
4.8.1 SS grade materials involving welding/forming during fabrication shall be of low Carbon or stabilized
grades.
4.8.2 Materials for non-pressure parts:
a) CS materials for non-pressure parts welded to pressure parts shall be of Boiler quality.
b) CS materials for non-pressure parts not welded to pressure parts shall be SA283/tested quality
or equivalent.
c) IS226 can be used upto 20mm thickness and IS2062 above 20mm thickness.
5.0 DESIGN & DRAWING APPROVAL
5.1 Drawing review/approval: Complete design of the Equipment and all fabrication drawings are to
be reviewed and approved by HPCL. After approval of HPCL, Suppliershall obtain TPI approval for
the same before proceeding for procurement of raw materials and stage-wise fabrication.
Fabricator should stand guarantee for design of the Exchanger. All as-built drawings shall be duly
certified by the TPI.
5.2 Vendor should re-check thickness of the Equipment provided in the drawing, as per code. If the
provided thickness is not sufficient as per code,Vendor shall provide the code thickness as per
calculations. Otherwise thickness provided in the drawing shall be opted for fabrication.
5.3 The supplier shall submit mechanical and thermal design calculations and fabrication drawings for
HPCL approval. The fabrication drawings shall be made to scale and show the following:
a) Overall size of the Equipment and assembly
b) Sizes, orientation and location of nozzles and saddles
c) The sketch showing Tube layout, indicating pass positions, cross Baffle cut, orientation, location
and number of by-pass sealing strips
d) Bundle layout, giving location of first and last Baffles and the Baffle spacing
e) Impingement Plate size and location
f) Bundle weight, empty weight and operating weights of the Exchanger
g) Details of parts, with part no., material specifications, quantity, size, weight, etc. including
spares
h) Testing plan, indicating the tests to be conducted on welds/materials and assemblies such as
NDT tests/Hydrotest/Pneumatic test and Destructive tests, etc.
i) Weld lines orientation and location with weld profiles and sizes
j) Edge preparation and method employed
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k) Brand name of Electrodes with equivalent AWS specifications
l) Welding procedures to be employed
m) Name plate location and details
n) Tolerances
o) Code certification and stamping requirements as indicated in the Purchase Order
p) Any other information or instructions to ensure compliance of shop procedures with code
requirements and those specifications along with the addenda
q) Purchaser’s Order number and Fabricator’s Shop Order number, Client’s name, Plant location,
Item tag no. etc.
5.4 HPCL’s review & approval of drawings shall not relieve the Supplier of his responsibilities to comply
with the applicable codes, standards & statutory regulations.
5.5 For Heat Exchangers under the purview of Indian Boiler Regulations, the Workshop drawings, after
preliminary approval of HPCL, shall be submitted to Chief Inspector of Boilers (CIB) of the State
where the Fabricator’s Shop is located. It shall be responsibility of the Supplier to incorporate
modification/additions, if required by CIB, and obtain final CIB approval. HPCL shall be kept
informed of all such changes/modifications desired by CIB. In case the Supplier’s Workshop is in a
location other than that of the State of proposed site, Fabricator shall submit the Shop drawings
simultaneously to the CIBs of the respective States. All costs involved before commissioning of the
Equipment shall be borne by the Supplier.
5.6 In case of Equipment requiring inspection by an independent authority like Lloyds, the Supplier
shall obtain necessary approval after getting the preliminary approval from HPCL at no extra cost.
5.7 The Supplier shall not proceed with fabrication of the Equipment unless the design and drawings
are approved by HPCL/Inspection Authority.
5.8 DEVIATIONS: In general, no deviations from HPCL standards and specifications shall be permitted.
This does not preclude possible innovations or improvements on the part of the Supplier based on
available facilities. Such deviations must be clearly pointed out as a separate paragraph entitled
‘DEVIATIONS’ in the Supplier’s bid, so as to avoid any confusion and ambiguity and to facilitate
analysis of quotation within the minimum possible time. It shall be taken for granted that except
for the deviations pointed out under the ‘DEVIATIONS’ paragraph, all other technical requirements
are adhered to by the Supplier. No deviations shall be incorporated, unless it has been approved in
writing by HPCL. It is in Supplier’s interest to get the written approval of HPCL for all deviations
before accepting the Purchase Order. No deviations shall be entertained or approved after the
Order has been accepted by the Supplier. Delay in supply of the Equipment on account of such
deviations being not entertained or approved by HPCL shall be contractor’s liability.
5.9 In case there are no deviations required by the Supplier, quotation under the ‘DEVIATIONS’
paragraph shall read as “EQUIPMENT SHALL BE SUPPLIED AS PER HPCL’S SPECIFICATIONS,
CODES,etc. IN ALL RESPECTS”. It shall be presumed that the Supplier has clearly understood the job
requirements and shall fully comply with them.
6.0 MATERIAL SUPPLY
6.1 All materials & accessories required for fabrication of the Heat Exchangers shall be supplied by the
Supplier unless otherwise stated. All materials procured from outside India shall be inspected by
reputed TPI agency cost of which shall be borne by the Supplier. Mill test certificates alone are not
final.
6.2 Name Plate: Stainless Steel Name Plate shall be provided by the Supplier on each Heat Exchanger
Shell.
6.3 Testing Devices: Test Rings andTest Flanges shall be designed and supplied by the Supplier.
Drawings for these also shall need prior approval of HPCL. The number of Test Ring/Flange
assemblies shall be equal to the number of Shells stacked.
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Test Ring shall be provided for all Floating Head Exchangers with bonnet on Channel side and for
Channel with flat covers having test pressure on Tubeside greater than the Shell side. Design all
testing accessories for testing the Bundle outside the Shell for Exchangers with design pressure on
Tubeside greater than the Shell side.
All necessary arrangements such as supports, Blind Flanges, Test Gaskets, Bolts& Nuts and other
accessories shall be provided by the Supplier for testing of the Heat Exchangers.
6.4 Accessories: Supplier shall include in his quotation supply of Tie Bolts, leveling shims or
intermediate supports for stacked units, Gaskets, Nuts & Bolts relating to interconnecting nozzles
(Tube and Shell sides). All these components shall be dispatched separately with due care having
been taken regarding identification of these for ease of installation. Supplier should also include for
minor modification/additions like Ladder, Insulation Cleats, etc. which may be required at a later
stage.
6.5 Earthing Lugs: Earthing Lugs shall be provided on each Heat Exchanger which shall be located in
such a way that the same do not foul with the Exchanger foundation bolts during installation.
6.6 Torque Devices: All Torque values for tightening the Bolts shall be mentioned in fabrication
drawings of the Heat Exchangers.
6.7 Davits: If required as per design, Davits shall be provided.
6.8 It is deemed that Supplier shall supply the Equipment strictly as per the requirements of the codes,
specifications, etc. As such it is presumed that unless indicated under the ‘DEVIATIONS’ paragraph
of the quotation, dimensions and materials for various components in a Heat Exchanger are as per
HPCL’s requirement. This does not preclude use of equivalent or better materials. However, these
deviations should be clearly indicated in the quotation. If an equivalent material sought by the
Supplier is to a specificationother than IS or ASTM/ASME, it might be necessary for the Supplier to
submit the specifications of the equivalent material (translated in English language if the original is
not in English).
7.0 SPARES TO BE SUPPLIED
7.1 Supplier shall supply 20% extra Studs and Nuts, but not less than 4 Studs with 8 Nuts for each pair
of mating Flanges, interconnecting nozzles, nozzles with Blind Flanges, etc.
7.2 Supplier shall also supply 4 sets of spare Gaskets other than those used or testing and/or during
transportation.
7.3 Any other spares, tools and tackles required for 2 years operation/maintenance shall be supplied.
Supplier shall submit the details of such spares in the offer.
8.0 FABRICATION
8.1 Plate Cutting
8.1.1 Carbon and Low Alloy Steels: Carbon Steel and Low Alloy Steel Plates are to be cut to size by
flame cutting and/or machining. When Plate thickness does not exceed 25mm, cold shearing
may be used provided that the sheared edge is cut back by machining or chipping for a
distance of ¼th
of thickness of the Plate but in no case less than 3 mm. All Plate edges after
cutting shall be examined for laminations to ensure that the sheared edges are free from
cracks. Dye penetration and Ultrasonic check of edges forming main weld seams is
recommended especially for higher thickness Plates when these Plates are used for low
temperature or in Hydrogen service. For Low Alloy Steel Plates, edges of the Plates shall be
preheated before flame cutting.
8.1.2 Austenitic Steels: Austenitic SSPlates should be cut by plasma cutting. However, for
thicknesses upto 15mm, cold shearing may also be adopted. In all cases, the cut edges shall
be ground back by 2 to 3 mm and checked for laminations and cracks. It is recommended
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that cut edges forming main weld seams of pressure containing parts be checked
ultrasonically or by Dye-penetration examination.
8.2 Handling of Materials
To maintain quality &finish of the materials, avoid any rusting and minimize additional cleaning
etc., following preventive measures should be taken:
a) Material should be kept in original cases or wrappers until fabrication actually begins. Cases or
wrappers may be opened for initial inspection, but after inspection these should again be
carefully packed. These should be stored indoors on clean racks, shelves or platforms and
should be suitably covered and kept free of shop dirt, pickling or plating fumes, particles or
scale from steel fabrication, lubricating oil, etc.
b) FabricatedEquipment should be cleaned of all residues before being employed for a new
operation on SS. Paper or other protective covering should be placed on all surfaces.
8.3 Rolling and Dishing of Plates
8.3.1 Rolling: Rolling of Plates shall be in longitudinal direction of the Plates. The direction shall be
clearly marked on the Plates.Re-rolling after welding is not normally recommended.
However, if for large diameter Shells, re-rolling of welded Shell course is required, this shall
be done in presence of the authorized Inspector. All welds on the section to be re-rolled
must be ground flush. After re-rolling, all the welds on the re-rolled section must be checked
by Dye penetration test. Such welds shall then be subjected to radiography as required by
drawings/codes.
8.3.2 Dishing:All dished heads shall be single piece construction and ellipsoidal in shape.
Torispherical dished heads with knuckle radius greater of 3T or 15% and crown radius 80% of
OD are also acceptable. Straight face shall be minimum 38mm or 3T, whichever is more (T
being the nominal thickness of Plate from which forming is done). Straight face in any case
need not exceed 50mm, unless specifically indicated otherwise. Dished heads shall be
subjected to dye penetration test on knuckle portions (both inside and outside) and weld
edges after heat treatment. All CS and LAS heads shall be normalized if not formed in
normalizing range. All SS dish heads shall be solution annealed after forming.
8.4 Welding
8.4.1 General: All welding procedures shall be submitted to HPCL for approval giving all relevant
details. Welding qualification records shall indicate hardness values of weld metal, HAZ and
parent metal and also results of impact tests when design temperature is 0oC or lower or
when specifically indicated for materials being welded. No welding shall be undertaken until
the welding procedure and welder’s qualifications have been approved by HPCL and/or by
the authorized inspection agency. All welding procedures and welders shall be qualified for
the particular type of welding and material in accordance with the ASME Boiler and Pressure
Vessel Code, Section-IX. Supplier shall be responsible for the quality of the welds performed.
8.4.2 Welded joints and procedures:Pressure holding butt joints shall be full penetration double
side welded butt joints. Root pass of single side welded butt joints shall be done with TIG
welding and with Argon Gas purge. This procedure shall also be followed for TubeSheet to
Shell welds in fixed TubeSheet Heat Exchanger. Backing Strips for single side welded butt
joints is not permitted. All other pressure holding welds and welds of Lugs, etc. with pressure
parts shall be full penetration and DP/MP tested.All internal welds on the Shell shall be
ground flush from inside. All other welds may be left in the descaled condition only.
However, for LTCS materials, even these shall also be ground flush or dressed smooth.
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8.4.3 Staggering of weld seams: Longitudinal seams shall be staggered with a minimum
circumferential distance between the centers of welds of 5 times the thickness of thicker
Plate. Weld seams shall be so located as to avoid connections and external attachments.
8.4.4 External attachments:External attachments like lugs, supports, etc. of Carbon Steel shall not
be welded directly to high Alloy or Austenitic SS Heat Exchanger components. These
attachments should be of the same material as the Heat Exchanger component. If this is not
so, intermediate Pad Plates of the same material type as the Heat Exchanger component
may be used. These Pads shall be at least 100mm wider and longer than the attachment and
shall be at least 5 mm thick. Welding of CS to Austenitic SS shall be done with 25%-Cr12%-Ni
Electrodes (AWSE309).
8.4.5 Tube-Tube Sheet welding: Tubeto Tube Sheet welding, if specified in the Heat Exchanger
drawing, shall be carried out as per the procedure approved by HPCL. No distortion
whatsoever shall be permitted on the Gasket seating surfaces due to Tube to Tube Sheet
welding. If distorted, the same shall be machined suitably.
8.4.6 Partition Plate welding: CS and 300 series SS, except for low temperature service, all
Partition Plates shall be welded to Channels, etc. by minimum 6mm continuous fillet welds
on both sides. For all other materials and low temperature services, all Partition Plate to
Channel welds shall be full penetration. Partition Plates thicker than 10mm shall be tapered
to 10mm at partition groove, except when mentioned otherwise on drawings. One no. 6 mm
dia.weephole shall be provided at the center of each horizontal Pass Partition Plate and a
5mm radius notch on top/bottom point of each vertical pass partition plate for all multi-pass
Exchangers for effective venting and draining.
8.4.7 Welding consumables: All welding shall be done with Electrodes, Fillers and Fluxes of
reputed make, with reproducibility of results. Brand names shall be specifically approved by
HPCL. For CS pressure parts, the Electrodes shall be of low Hydrogen type.
8.4.8 Cladding shall be cut back at all seams to permit back welding of the basemetal. Weld metal
shall be ground flush and fully covered with the applicable weld deposit. The weld deposit
shall be at least as thick as the lining.
8.4.9 Cladding shall be 100% ultrasonically examined for lack of bond after forming and, if
necessary, repaired by weld overlay of the same or similar analysis. Nozzles may also be clad
by explosion bonding with the same examination as for clad heads, or tubular liners may be
used which shall be welded to the alloy facing at the flange end and to the inside flush with
the Exchanger vessel.
8.4.10All weld overlay, whether manual or automatic procedure, shall be liquid Dye penetrant
examined in accordance with the methods described in ASTME165. When the overlay
involves two passes (layers) and the procedure uses an intermediate heat treatment with
cooling to room temperature prior to applying the second layer, each layer shall be
examined. Where overlay is to be machinedsuch as in nozzles and flange facing, machined
surface shall be examined. If 100% of overlay is examined prior to the final post weld heat
treatment, the overlay shall be spot examined (no less than 10% of the surface) after heat
treatment. Spot examinations shall be conducted after shop hydrostatic testing.
8.5 Tube Sheet and Baffledrilling
Tube holes in Tube Sheets shall be drilled so as to allow not less than 0.8mm in diameter of metal
for reaming. These shall then be reamed to final size. Before the final reaming operation is done,
Supplier should check the actual OD of the Tubes for the respective Heat Exchanger. This is of
major importance in case of Austenitic SSTubes. Tube hole grooving in Tube Sheets shall be carried
out. Tube holes in Baffles and Tube Sheets shall be de-burred and cleaned before assembly. The
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interior surface of the Tube holes in Tube Sheets shall have a smooth finish and be free from spiral
scratches and scores.
8.6 Cleaning of Tube Holes
After reaming operation, suitable precautions shall be taken to ensure that interior surfaces of the
Tube holes are maintained free of rust, until Tubes are inserted. Before insertion of Tubes, Tube
holes and Tube ends must be free from oil, grease, dirt and protective coatings (on Tubes as
received from mill) and other foreign matter. For this purpose,Tube ends must be thoroughly
cleaned for a distance of at least one Tube sheet thickness plus 30mm. Cleaning solution should be
chlorides free (especially for Stainless Steels) and should not lead to fire hazards. This solution may
be sprayed by an air-pressured Spray Gun.
8.7 Nozzle Flanges, Nozzles and Reinforcement Pads
8.7.1 Flanges: Unless otherwise indicated, dimensions, drilling, facing and tolerances for nozzle
Flanges (and Blind covers, if required) up to 24˝ NB shall be as per ANSI B16.5 for the
respective class. Flanges above 24˝ NB shall be as per API 605, unless indicated otherwise.
Bolt holes on these nozzle Flanges shall straddle on principal vertical and horizontal
centerlines of the Equipment. If the component to which nozzles are attached is
subsequently stress relieved, it shall be Supplier’s responsibility to maintain true Gasket
faces by machining or otherwise. If distortion expected is considerable, final machining
operation should be done after stress relieving. Sufficient matching allowance for this
purpose should be available. Nozzle Flange facings, Gaskets and bolting details for nozzles
with the piping specification and class shall be indicated on the drawing.
8.7.2 Nozzle Pipes:Nozzle Pipes shall be attached to the Heat Exchanger components by full
penetration welds. Attachment welds using only inner and outer fillet welds are not
permitted. Unless otherwise shown on the drawings, necks of all nozzles shall be flush with
the inside of the Heat Exchanger component. Inside corners of nozzle Pipes of Shell/Channel
ID shall be rounded off to 3mm radius. All nozzles 2˝NB and below shall have two nos.
Stiffeners, 30 mm wide x 6 mm thickness, placed at right angles. Pipes shall be to ANSI
B36.30 or 36.19, as applicable.
8.7.3 Reinforcement Pads and testing: Reinforcing pads, whenever required as per codes, shall be
of the same material or equivalent as the Heat Exchanger component to which it is welded.
All Reinforcement Pads shall be provided with two nos. 1/8˝ (3mm) NPT tapped holes located
180o apart for Air-Soap solution test. This test shall also be required to be carried out for slip-
on Flanges. Pressure of 1.25 kg/cm2g is suggested for these tests. Higher test pressure are
not recommended because of accompanying risks and also because the Soap bubbles have a
chance to blow off. Tell-tale holes in the Reinforcement Pads shall be plugged with heavy
Grease, unless otherwise indicated.
8.8 Bolts, Studs etc. & Tapped Holes
All inch bolting and threading shall conform to ANSI B1.1, except for size 1˝ and above where it
shall be 8 threads per inch. Metric bolting/threading shall conform to ISO261 (coarse), tolerance
medium, except for size M24 and above, where it shall have 3mm pitch. Studs shall extend beyond
the Nuts by about 10mm and shall be threaded full length. Threads on external bolting, plugs, etc.
shall be lubricated with Graphite Grease for working temperatures upto 200oC and with
Molybdenum di-sulphide for higher temperature. All Nut seating faces shall be machined or spot
faces. Tapped holes drilled on the Channel side face of clad Tube Sheets for removable Bundles
shall be fitted with Plugs of a material similar to Channel side material. Eye Bolts for these shall be
provided loose and unless otherwise indicated, shall be of CS forged. Flanged joints shall be
provided with Jack Screws and necessary Lugs as per HPCL Standard. For extended Tube Sheets,
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tapped holes shall be provided for girth bolting. Studs for these shall have square ends. Nut height
shall be equal to Bolt diameter.
8.9 Assembly and Handling
8.9.1 Suitable method of alignment like Dowels, etc. shall be provided to prevent mis-assembly of
Channel, Channel Covers, Stationary Tube Sheet, etc.
8.9.2 Heat Exchangers, which are stacked in service, shall be assembled in the Workshop for a trial
fit. Special care shall be exercised in truing up connecting nozzle Flanges. Complete assembly
shall be given a hydraulic test as a single unit except when the test pressures for individual
Heat Exchangers are different.
8.9.3 In case of removable Bundles:
a) Stationery Tube Sheets shall be drilled and tapped at vertical (0o) position for attaching
Eye Bolts or a Lifting Lug of adequate thickness that shall be welded with minimum 25
mm diameter hole.
b) Drilling and tapping, as above, may be carried out on Floating Tube Sheet.
c) Last Support Plate shall be drilled (25 mm diameter) for lifting. Local stiffening may be
necessary to adequately support the Bundle.
d) Tube Bundle pulling force shall be taken as 100% of the Tube Bundle weight.
8.9.4 Adequate lifting and handling Lugs, etc. shall be provided by the Fabricator to ease handling,
lifting, erection, etc. of the complete Equipment.
8.9.5 Pulling Eye Bolts shall be provided for all removable Bundles.
8.9.6 Davits shall be provided for removal of Channel, Channel Cover, Shell Cover and Floating
Head assembly, if necessary as per design.
8.10 Descaling, Pickling, etc.
Descaling, pickling and passivation shall be done for all Stainless Steel surfaces or parts which are
subjected to high temperature (500oC and above) during forming (like U-bending of Tubes or
dishing) or welding. The Supplier shall supply details of the procedure for approval.
8.11 Fabrication Tolerances &Finish
8.11.1 Dimensional tolerances shall be within the limits indicated in standards. Where tolerances
are not specified, these shall be in accordance with the requirements of TEMA (latest
edition).
8.11.2 All edges and corners shall be de-burred (or radiused, if shown).
8.11.3 Finish of all machined components shall be minimum 12 microns (500 RMS), unless
otherwise indicated. Parts subjected to Ultrasonic examination shall have minimum finish of
6 microns.
8.11.4 Tube Sheet faces shall be flat within ± 1.5mm (camber).
8.12 For non-ferrous Heat Exchangers, paragraphs NF 7 and NF 14 of Appendix NF in part UNF of
Section-VIII Div.1 of ASME code are mandatory. This applies to non-ferrous cladding or applied
lining also.
9.0 RADIOGRAPHY AND OTHER NDT REQUIREMENTS
9.1 General
9.1.1 The minimum extent of radiography shall be spot.
9.1.2 Supplier shall allow for full radiography in case of Heat Exchangers which fall under the
following categories:
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a) Exchangers under IBR
b) Where the relevant design code/specification does not permit a lower class of
construction.
9.1.3 All pressure retaining welds which are not required to be radiographic shall be subjected to
either Magnetic particle or Dye penetration check or both at the discretion of the Inspector
after root pass welding, final welding and back chipping.
9.1.4 Radiographic and other requirement for Low Alloy Steel welds shall be in the heat treated
and final condition.
9.1.5 If radiography is being substituted by UST for the final closing seam as permitted by code,
Magnetic particle inspection shall be carried out in addition to UST.
9.2 Spot Radiography
When spot radiography is asked for, it shall mean that at least 10% of the total welded length must
be radiographed.Length of each radiograph shall be atleast 250mm. Further, all ‘-‘ joints must be
radiographed and at least one shot must be taken on each longitudinal and circumferential seam.
HPCL authorized Inspector shall mark the areas to be radiographed. This requirement shall
supplement the ones specified in ASME Section-VIII Division 1.
9.3 Acceptance Standards or Radiography
Acceptance standards for radiography shall be as per ASME Section-VIII Division 1.
10.0 HEAT TREATMENT
10.1 Post Weld Heat Treatment (PWHT) shall be done when required by relevant fabrication
specification, codes, service conditions, etc. No welding or heating is permitted after PWHT
operation.In addition to code requirements, CS and LAS shall have PWHT (including Tube to
TubeSheet joint, if welded), if –
a) Under lethal service
b) Low temperature below 0oC (Tube to TubeSheet joint excluded for temperatures warmer
than specified)
c) Sour service (wet H2S)
d) Hydrogen service
e) Amine or Caustic services, etc.
f) Under IBR
g) Other services where stipulation of hardness of welds are applicable
h) Other services where stipulation of impact tests of welds are applicable
10.2 All machining operations shall be carried out after Heat Treatment. It shall be the responsibility of
the Supplier to leave sufficient allowance for this purpose.
10.3 Supplier shall submit the procedure for PWHT alongwith the fabrication drawings for HPCL’s
approval.
10.4 Contact expansion in case of welded Tube to Tube Sheet joint shall be done after PWHT.
11.0 INSPECTION & TESTING
11.1 General
Inspection shall be carried out by HPCL representative or HPCL approved TPIA appointed by the
Supplier as per the PO terms, hereinafter referred to as the authorized Inspector.The materials,
fabrication and testing of Exchangers shall be open to inspection by the authorized Inspector in
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addition to any inspection required by the specified code or by local authorities having jurisdiction
over the installation.Inspection shall be carried out both during fabrication and before delivery and
also for sub-ordered materials, in any. In addition to final inspection and certification by Inspector;
during the course of manufacture, authorized Inspector’s written approval shall be obtained by the
Supplier at all stages of fabrication including:
a) Raw material identification
b) Edge preparation for welding, including visual check for laminations
c) Alignment of longitudinal and circumferential seams
d) Rolling tolerances on individual section
e) Alignment of sections and components
f) Root pass clearance before welding and cleaning
g) Thinning of dished ends and toriconical pieces after forming
h) Checking of tube sheet after drilling, including visual check for laminations
i) TubeSheet to Shell set up for fixed TubeSheet Exchangers, prior to welding operation
The presence of authorized Inspector shall not modify or reduce the obligation of the Supplier to
carry out his own tests and control. Should any material and/or Equipment be found not in
compliance with the requirements specified, the authorized Inspector or his delegate shall be
entitled to irrevocably reject them, even if such non-compliance has not been evidenced in the
course of inspection and/or tests.The authorized Inspector will, at the time of initial visit, set up
with Supplier actual details of inspection stages to be witnessed or carried out; the schedule of
further visits and subsequent inspection notices can be arranged between the Inspector and the
Supplier. Supplier shall notify the authorized Inspector sufficiently in advance on any fabricating
operations to permit him to arrive at the Vendor’s Shop in time to witness.
Prior to final inspection all slag, weld spatter, loose scale, dirt, grit, paint, grease, oil and other
foreign matters shall be removed in order to facilitate inspection. All Reinforcing Pads and Slip-on
type Flange welds shall be pressure tested with Air-Soap solution before and after heat treatment
(if any) and before final hydrostatic test.A dimensional checking of Equipment shall be carried out
taking into account the tolerances shown on HPCL standards, design specifications or applicable
codes. The more stringent values shall govern. Dimensional checks are to be taken of the internal
measurements of equipment together with external ones and these are to be recorded on a copy
of the drawings as being the “As-built” dimensions.
11.2 Hydrostatic and Other Tests
11.2.1 These tests shall be witnessed by the authorized Inspector. When hydrostatic tests are
performed, the indicating Gauge shall be connected to the uppermost part of the
Equipment. Testing water shall be Salt free. For SSEquipment and Exchangers with SS
Bellows, use De-Mineralized Water or Condensate. Final hydrostatic tests shall be carried out
using service Gaskets and the Equipment shall be dispatched in as tested condition.
Minimum metal temperature during hydrostatic tests shall be 20oC. Test pressures shall be
maintained for at least one hour.Shell and Tube sides shall be tested separately, unless
otherwise mentioned on the drawings. For TubeSheet designed for differentialpressure,
special care shall be taken during testing. Equipment drawings shall clearly indicate by a
note, if Tube Sheets have been designed for differential pressure.
11.2.2 All vertical Exchangers shall be tested in vertical position. Alternatively, test pressure may be
modified with prior HPCL approval.
11.2.3 Stacked Exchangers, with nozzles interconnected, shall by hydrotested in the stacked
condition.
11.2.4 Supplier can appoint any of the following HPCL approved TPIAgencies for the job:
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a) Lloyds; b) Bureau Varitas; c) CEIL; d) DNV; e) TUV; f)Velosi; g)Bax Counsel
11.2.5 Irrespective of Third Party Inspection, HPCL will have the right to visit Vendor's premises to
ascertain quality and progress of jobs. All TPI charges shall be clearly mentioned in the offer
and payable as per the PO terms. All materials to be approved by TPI and sample to be
provided free of cost for additional testing by HPCL if required.
12.0 STAMPING AND NAME PLATES
12.1 Name Plate: Each Exchanger shall be fitted with a Name Plate as per standard.
12.2 Item/Tagnumber Stamping: The following Exchanger parts shall bear HPCLExchanger item/tag