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7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Description of Revision................................................................................................................38
1 General ..................................................................................................................................392 Inspection of pipeline components ....................................................................................40
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 4 of 50
1 General Regulations
2. This criterion is especially made for improving the construction standard for oil andnatual gas and ensuring the quality of fabrication and installation and hence achieving
the goal that the construction is technically advanced, economically fitted, safe and
reliable.
3. The criterion applies to new and modified (expanded) in-station process pipeline
construction relating to oil and natual gas receiving and transportation.
4. The criterion doesn’t apply to dehydration equipments at oil and gas fields, pipelines in
refinery and natural gas purification plant, process pipelines in gas station, internal
pipelines in pumps, heating furnace and flowmeters as well as other equipments alike
and in-station high temperature heat-conducted pipelines.
5. Industrial health, safety and environment protection requirements involved in process
pipeline constructions should also abide by legitimate regulations by state or regional
governments on industrial health, safety, environment protection and so on.
6. Contractor for process pipelines in gas stations must have rich experience in
constructions of petroleum project and have gained relevant certificates for practice as
construction companies and established quality assurance system, so that the
construction quality can be reliable.
7. Construction and acceptance of the process pipeline should be in accordance with the
criterion as well as current state peremptory codes and regulations.
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 6 of 50
4. Permissible variation of central circle diameter in flange bolt is ±0.3mm; permissible
variation of flange thickness ±1.0mm; permissible variation of center-to-center
distance between two neighboring blot holes ± 0.3mm; permissible variation of
center-to-center distance between any two bolt holes ± 1.0mm.
2.3.5 Fittings and fasteners for use in acid environment should be processed
according to design requirements and can only be used after being qualified.
2.3.6 Flange joints, as bolt, nut and spiral gasket, should meet installation
requirements and be free of gouges, burrs, edge rolls and broken thread, which could
effect the installation.
2.3.7 Bolts and nuts for use in high pressure pipelines should meet relevant
regulations of current state criterion; before using them, randomly pick two from each
batch and take hardness test; inspect more if non-qualified products are found; if
there still reports of non-qualified products, then inspect them one by one;
non-qualified ones shouldn’t be used. When diameter is no less than M30 andworking environment temperature no less than 500, hardness test should be done
one by one; nuts with unqualified hardness shouldn’t be used; if some bolts fail in
hardness test, pick two bolts which are respectively the highest or the lowest, and
then inspect their mechanical performance, if one is unqualified, then take more bolts
with the neighboring rigidity to inspect; if unqualified ones are still reported, then the
whole batch shouldn’t be used.
2.3.8 Inspection and quality of tee should meet the following requirements.
1. Main pipe should be tapped according to actual internal diameter of branch pipe. The
hole wall should be smooth. Permissible hole diameter variation is ±0.5mm.
2. Surroundings of hole in the main pipe and groove in the branch pipe should be clean
and free of any dirt, grease and rust spot.
3. End bevel of tee end face is 35°±5°, root face is 1.0-2.0mm.
4. Permissible variation of vertical degree between main pipe and branch pipe should be
less than 1% of branch pipe height and less than 3mm as well.
5. Permissible variation of each end face vertical degree should be no more than 1% of
external diameter and no more than 3mm.
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 8 of 50
Continued
Nominal diameter Inspection item
25-70 80-100 125-200 250-400 500 600 700
Outside circle perimeter ±4.0 ±5.0
Wall thickness
reduction value
Mid-pressure≤12.5% of wall thickness, hi-pressure≤10% of wall
thickness
Length
variation(semidiameters
for elbow)
≤2.0 ≤3.0
End face obliquedegree
≤1.0 ≤1.5
Roundness ≤1% of nominal diameter
3. Elbow diameter should be consistent with internal diameter of jointed pipe.
2.3.11 Inspection and quality of reductor should meet the following requirements:
1. Wall thickness of reductor should be longer than the wall thickness of the pipe
adjoining with the larger diameter end.
2. Roundness of reductor should be no more than 1% of external diameter of itsadjoining end, and no more than 3mm. Center lines of the two ends should be
overlapping. The eccentric value should be no more than 5mm.
3. Permissible dimension variation of reductor should meet the regulations in Table
2.3.10.
4. Eccentric reductor should be inspected according to design requirements.
2.3.12. Inspections and quality of supports and hangers should meet the following
requirements:
1. On the surface, there should be no burr, rust, crazing, lack of weld, air hole as well as
other defects.
2. On surfaces of springs for use in supports and hangers, there should be no crazing,
fold, delimination, rust and so on. Variation of number of working turns is less than
half a turn.
3. Under free condition, each space distance between every two neighboring turns of
the spring should be the same; and the permissible space distance variation should
be no more than 10% of mean space distance.
4. Supporting faces on both ends of the spring should be vertical to the spring axial line
and the permissible variation should be no more than 2% of free height.
2.313. Inspection of pipeline compensators should be taken according to instruction
books and design requirements. The dimension variations should meet the followingrequirements.
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 10 of 50
4. In pressure test of valve density, the valve should be semi-open. Get the water flowed
into the middle capsule to test the pressure integrally. In pressure test of seal, test the
valve opening at the condition of unsymmetrical pressure. Manual valves should be
opened at the condition of unsymmetrical pressure and check the handwheel flexibility
and seepage conditions of the stuffer box; for electric valves etc., as required, the
stopper switch should be commissioned, then after operation with test pressure,
opening of the valve should be tested at the condition of unsymmetrical pressure.
Both sides need to receive such a test. Open pressure should be larger than working
pressure. Unqualified valves mustn’t be used.
5. Density and seal tests for check valve and stopper can be done according to flow
direction. For check valve, seal test should be done in reflux direction, while density
test in influx direction. For stopper valve, both hardness and seal tests should be done
by influx direction.
6. When the valve is qualified for pressure test, remove its inside stagnant water (including the middle capsule), paint a protection layer to the seal face, shut it down,
close the main inlet and then fill in Valve Pressure Test Record.
2.4.4 Pressure commission should be done prior to safe installation of the valve. Its
open pressure is 1.05-1.15 times as much as its working pressure. Its re-seating
pressure should be 0.90-1.05 times as much as its working pressure; it should be
commissioned for at least 3 times. When the valve is commissioned to be qualified,
get it lead-sealed and fill in the test record.
2.4.5 Hydraulic ball valve actuator should be inspected according to instruction book.
Pressure oil level stays at the 2/3 point in height of the oil indicator and all parts the
valve work actively.
2.4.6 Inspect electric valve actuator and seal and lubricant parts of the motor and
make sure the actuator and electric parts are in good and flexible state and
commission the stopper switch well.
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 15 of 50
Carbon
steel
C 10,15,20,
25
60-650
16MnC-Mn
16MnR
600-650
09MnV 600-700C-Mn-V
15MnV 600-650
C-Mo 16Mo 600-650
12CrMo 700-750
15CrMo 700-760
12CrMo 700-760
5CrlMo 700-760
C-Cr-Mo
9CrlMo 700-760
C-Cr-Mo-
V
12CrlMo
V
700-760
2.25Ni 600-650
Low-and-
mid alloy
steel
C-Ni
3.5Ni 600-630
When
heating
temperature
raising by
400,
heating
speed
should be
no more
than
205×25/T(
/h)
Constant
temperatu
re time
should be
1 hour for
every
25mm
wall
thickness
and less
than 15
min.
During the
constanttemperatu
re time,
the gap
between
the
highest
and the
lowest
temperatu
res should
be less
than 65.
Cooling
speed
following
constant
temperature
actions
should be
less than
260×25/T(
/h) and
no more
than
260/h.
Naturalcooling is
available
under
400.
Note: T indicates thickness (mm).
3.2.4 Quality of the elbow should meet the following requirements:
1. No crazing (by vision test or according to requirements of design document).
2. No burnt, delamination or other defects.
3. No wrinkle.
4. On any section of the elbow with design pressure no less than 10MPa, the larger external diameter minus the smaller external diameter should equal to a result which
should be no more than 5% of the external diameter of the front pipe; The wall
thickness of the front pipe minus the wall thickness of the elbow should equal to a
result with should be no more than 10% of the wall thickness of the front pipe. The
pipe end center variation value⊿ should be no more than 1.5mm/m, when strainght
pipe length L exceeding 3m, the variation value should be no more than 5mm.
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 27 of 50
techniques, such results need to be further confirmed. When any element of
such results is not in accordance with actual situation, it should be re-assessed
according to the welding requirements and procedures of this cretarion to identify
whether the results should be used for reassessment of the welding techniques.
5.1.4 Edit work procedures for the welding techniques according to qualified
assessment reports of the welding techniques.
5.1.5 Personnel who participate the welding work should follow the welding procedure
and must be holders of welder certificates and should be qualified welders. The
welders should carry out the welding work according to various welding types
and procedures. Tests to the wders should be done according to the regulation in
Chapter 6 of Welding, Inspection and Acceptance Rules for Pipeline SY/T
4103-1995.
5.2 Welding
5.1 Materials to be used before welding should meet the following requirements:
1. Welding rods have no damage, change of color, grease or dirt; welding wires have no
rust, corrosion or pollution; welding fluxes have not gone bad; purity level and
dryness level of protection gas satisfy the requirements of regulations and
procedures of welding techniques.
2. Dry welding rods according to their product instruction before using them. When there
isn’t such requirement, low-oxygen welding rods should be tried at 350-400 andplaced for cooling within 1-2 hours (constant temperature time). World sites should be
equipped with constant temperature driers (cylinder) and their temperature should be
controlled within 100-150 . Take out of the welding rods anytime when you need to
use them. Welding rods that are not used up should be recollected and reused after
being dried, but number of re-drying should not exceed two. Fibrin welding rods don’t
need to be dried when being well packed and not affected with damp. If they are
affected with damp, they need to be dried at 80-100 and their drying time is 0.5-1
hour.
3. During welding process, if chemical coating of welding rods comes off, becomes red
or seriously encounters arc bias, the welding rods should be immediumtely replaced.
5.2 Under the following disadvantageous situations, if there's no effective protection
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 28 of 50
steel, -15 for low-alloy and -5 for low-alloy dead-hard steel.
5.3 Types of abutting joints of pipes should meet the regulation at Item 3.1.4 of this
cretarion.
5.4 When doing buttweldfor pipe groups, manual or machine cleaning to chamfers and
their inside and outside surfaces should be done. Remove any oil, paint, rust, burr and
other dirty things within 100mm range of area to pipeline edges.
5.5 Types of pipeline welding line of buttweld should meet the following requirements:
1. Distance between two neighboring welding lines mustn't be less than 1.5 times of
nominal diameter of the pipeline and mustn't be less than 150mm.
2. Distance between welding lines of buttweldof pipelines and supporting suspended
frame mustn't be less than 50mm; the distance for those welding work requires heat
treatment mustn't be less than 300mm.
3. Distance welding lines of buttweldof pipelines and starting points of siphon mustn't be
smaller than 10mm and the distance should not be larger than its external diameter.4. Straight welding line of spool lognitudinal pipe should locate at a place where is easy
to be maintained and not on bottom of the pipe.
5.6 It’s better to order the channel elbow used for industrial pipes according to actual
needs; must use buttweldof straight opening.
5.7 Prohibited to have arc strike on pipe wall outside of the chamfer while doing welding;
ground wire of arc-welding machine should have reliable connection methods to
prevent and avoid generation of electric arc between ground wire and pipe wall.
5.8 For prefabricated anti-corrosion pipe sections, before welding, effective protection
measure should be taken for anti-corrosion coating of the pipes.
5.9 When welding the pipeline, root pass should be well melted and have good formation
of shape at the back; it’s better to proceed root pass and thermal weld consecutively;
time interval among other layers should not be too long; current day’s weld junction
should be completed on the current day.
5.10 Every time after you complete welding a welding job, carefully remove welding
slag and carry on with another step of work after removal of contain defects.
5.11 Upon completion of welding each weld junction, use a pen or sticker to mark
down welder’s name or work group code and workflow number at a point which is
100kmm below the weld junction.
5.3 Welding heat treatment
5.3.1 Pre-welding and post-welding heat treatment of welded joints should be identified
in welding process assessment according to design requirements and rigidness of
weldment structure.
5.3.2 When welding different kinds of steel materials,preheating temperature should be
identified according to the requirements to steel materials of poorer solderability.
5.3.3 Preheating should be done evenly at both sides of weld junction and area around
the weld junction; partial overheat should be prevented; preheating width shouldbe 100mm to both sides of the weld junction.
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 29 of 50
5.3.4 For welding requires preheating, during the welding, interlayer temperature should
not exceed its preheating temperature.
5.3.5 Post-heating and heat treatment should be done according to the process
regulation identified through welding process assessment.
5.3.6 Heating range of heat treatment should be an area described as: both sides of
weld junction is respectively 3 times larger than welding line width; and not smaller
than 25mm; and is within a range which is 100mm in diameter to the heating area.
The temperature within the heating range is kept still.
5.3.7 Weld junctions treated with heat treatment should be meeting the design
requirements; otherwise, a new round of heat treatment should be done to the
welding lines. A welding line can’t be treated with heat treatment for more than
twice.
5.4 Inspection and Acceptance to Welding Lines
5.4.1 100% appearance check should be performed to pipeline connection welding
lines. Appearance check should meet the following regulations:
1. Clean welding line, welding slag and spills around them and remove any dirt. Arc
burning to base metal should not appear.
2. Allowed thickness differential rate of welding line should not be 10% and not longer
than 1.6mm.
3. Welding line width should be a figure which is 1-2mm more to the figures for both
sides of the upper opening of the chamfer.4. Residual height of welding line surface should be 0-1.6mm and partially not larger
than 3mm and the length not larger than 50mm.
5. Welding lines should be tidy and even and have no cracks, inadequate welding, air
hole, slag inclusion, burn-through and other defects.
6. Partial appearance of undercut is allowed for cover welding pass. Undercut depth
shouldn't be longer than 12.5% of wall thickness of pipe and shouldn't be longer than
0.8mm. While welding any 300mm continuous length, accumulated undercut length
shouldn't be longer than 50mm.
5.4.2. After passing appearance check of a welding line, its nondestructive inspection
should be done. Ray destructive detection should be done according to Photography
of Welding Line Ray and Quality Grading for Pipelines for Petroleum Natural Gas
SY4056 and ultrasonic destructive detection should be done according to Ultrasonic
Destructive Test of Welding Line and Quality Grading for Pipelines for Petroleum
Natural Gas SY4065.
5.4.3. Nondestructive inspection of welding line should be done by professional
personnel who have passed contain tests and become holders of qualification
certificates issued by Qualification and Test Committee formed by nondestructive
inspection testers for boiler pressure vessels. Test Rules for Inspectors Doing
Nondestructive Inspection is used as an outline to the test. Test result andqualification assessment should be done by personnel who have acquired a Level II
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 31 of 50
6. Excavation and Backfill for Pipe Trench
6.0.1 For excavation of Pipe Trench, an extra height of 100mm should be added to
elevation of pipe bottom.
6.0.2 Before laying pipelines into Pipe Trench, re-test should be done to the Pipe
Trench and the pipelines should only be laid into the trenches.
6.0.3 Permissible variations of sizes of Pipe Trench should be meet the following
regulations:
1. Variation of central lines of Pipe Trench: +/-100mm.
2. Permissible variation of evaluation of pipe bottom: +/-100mm.
3. Permissible variation of central lines of Pipe Trench: +/-100mm.
6.0.4 Before laying pipelines into Pipe Trench, workers should remove all clasped
objects and blocks of pan soil and rocks, clean inside of the Pipe Trench and eliminate
stagnant water. If some Pipe Trench are damaged (over-excavation, being socked with rainwater) or encounter rock tunnel bottom, an extra depth of 200mm should be
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 32 of 50
excavated and paved with sand or soft soil.
6.0.5 The pipelines should, under the current day's of having zero outside force, be
closely placed in the center of the trenches and the suspended sections should be
filled with fine soil or sand.
6.0.6 Before backfilling the Pipe Trench, the following works should be completed:
1. Welding line nondestructive inspection to the pipelines is passed.
2. Leak detection test to the external anti-corrosion insulation layer is passed.
3. Intensity test and leakproofness test to the pipelines are passed.
4. Carry out inspection and acceptance to hidden construction works.
6.0.7 Backfilling of the Pipe Trench should comply with the following regulations:
5. Within a circle area whose diameter to the pipelines is 200mm, fine soil should be
used as the backfilling soil.
6. Compact the backfilling soil layer by layer; thickness of each layer should be
200-300mm.
7. Purge and Pressure Test of Pipeline System
7.1. Requirements before purge and pressure test
7.1.1 After completion of installation, the pipeline system must be purged andpressure tested before starting production, sundries inside the pipelines shall be removed,
quality of pipelines and welding lines shall be checked.
7.1.2 Installed pipelines, equipments, pipe fittings and valves, etc. shall be inspected
and checked; shall be in accordance with the requirements of construction drawings.
7.1.3 Soil shall not be backfilled to the buried pipelines before pressure testing, the
above-ground pipelines shall not be painted or heat preserved.
7.1.4 Pressure gauges used for pressure tests must pass inspection and shall be lead
sealed. The precision grade of the inspection shall not be lower than 1.5 and themeasurement distance shall be 1.5 times of the maximum test pressure. The division
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 34 of 50
and the pressure shall be stabilized for 30 minutes, and shall pass the inspection.
7.3.4 When detecting leak by using pneumatic test and vesicants, the inspection shall
be performed by sections. The pressure shall be increased slowly and the
pressure of the system shall be increased to 0.5 times of the strength testpressure to stabilize the pressure and hunt leak; in the case of zero abnormal
conditions nor leak, the pressure shall be gradually increased by 10% of the
strength test pressure, the pressure shall be step-by-step increased and the leak
detection shall be inspected for qualification at each step and the pressure shall
be increased to the strength test pressure; after the hunted leak has passed the
inspection, the pressure shall be deceased to the design pressure for leak test
and then it shall pass inspection in the case that no leak was hunted. Each
pressure stabilizing time shall be determined according to the adopted vesicants
and the requirements of the leak detection work.
7.3.5 If there are leaks in the pressure test, the pipelines mustn’t be repaired with
moving pressure. After repairing, the pressure shall be tested until it is qualified.
7.3.6 In the case that natural gas is adopted as test medium, the test shall be
performed under dry condition and the air inside the pipelines shall be replaced
by natural gas.
7.3.7 After pressure test being qualified, the pipelines shall be purging with the
pressure of 0.6-0.8 MPa to make the interior of the pipelines dry and free of any
sundries.
8 Anti -corrosion and heat preservation
8.1 General regulations
8.1.1 After passing the intensity test, leak test and appearance inspection, the pipelines
shall be anti-corrosion protected according to the design requirements.
8.1.2 The adopted anti-corrosion and heat preservation materials shall come with their
product conformity certificates.
8.1.3 The anti-corrosion joint coatings and repair of coating defects of buried pipelines
shall be in accordance with the regulations of anti-corrosion in present standard.
8.1.4 The leak detection method shall comply with the regulations in Test Methods of
Leak detection for Pipeline Anti-corrosion Layer SY/T0063.
8.2 Painting
8.2.1 Before painting, rust on surface of metal shall be removed according to the design
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 37 of 50
clients) shall organize meetings with constructors and design units and
supervision units to be together for completing overall review, inspection and
acceptance of the in-station process pipelines according to this cretarion and its
design requirements.
2.0.2 After handover of the in-station process pipeline project, edition of handover
documents should be done according to its contracts or design requirements. If
there are not any requirements, constructors shall provide the following technical
documents:
3.0.3 1 Description of project.
2 Project assessment tables of main objects being inspected and handed over.
3 Notices of modification to construction drawings.
4 Technical assessment and verification (contact) lists.
5 Records of operations for anti-corrosion insulation work.
6 Records of works for checking, inspecting and accepting hidden projects.7 Qualification certificates of raw materials for equipments, valves, pipe fittings, welding
materials and so on.
8 Records of pressure tests for valves.
9 Reports of tests for non-destructive inspection.
10 Records of tests for intensity and waterproofness.
11 Records of pipeline purging work.
12 As-built drawings.
Description of standard terminology and definitions
When performing the items of this cretarion, for the wordings, which are strictly required to
be used in the contents, are described below so that they can be treated differently in the
performance:
1 Wordings of strict restriction in usage, which mean that something has to be done incertain way:
Positive word: “have to”;
Negative word: “prohibit”.
2 Wordings of strict restriction in usage, which mean that something has to be done in
certain way under normal situation:
Positive word: “should”;
Negative word: “shouldn’t” or “mustn’t”.
3 Wordings of some options in usage, which mean that something has to be done first
when condition allows:
Positive word: “suitable”;
Negative word: “unsuitable”;
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 38 of 50
For wordings of some options in usage, which mean that something can be done under
contain condition, use “can”.
At tachments
Rule of Construct ion and acceptance for Petroleum Natural Gas
In-station Process Pipeline Project
Descriptions of Items
Description of Revision
On the foundation of the revised standards of Construction and Acceptance Rules of
In-station Process Pipeline Project for Distance Transportation Pipelines SYJ 4002-90,
according to the requirements of Doc. No. 33 of China Petroleum Technical Supervision
Bureau issued by China National Petroleum Corporation, according to recent years’
demand of development of the construction for in-station oil and gas process pipelines,
these rules are established and edited to satisfy the demand of national infrastructure
construction for petroleum natural gas projects and meet the requirements of international
standards.
According to the needs of infrastructure construction projects for petroleum natural gas
and the actual situations in practice of the standards, and for the consideration of having
the uniformity of these performance standards, the contents of the rules in the three
criterions, Rules of In-station Process Pipeline Project for Distance TransportationPipelines SYJ 4002-90, Construction and Acceptance Rules of In-station Process Pipeline
Projects for Receiving and Transporting Station of Natural Gas SY/T4067-93 and
Construction and Acceptance Rules for Fabrication of Manifest and Installation Work
SYJ4023-89, has been combined and revised and the revised criterion is named
Construction and Acceptance Rules for In-station Process Pipeline for Oil and Natural
Gas.
In the process of the revision of the rules, all relevant units have been consulted for
suggestions; the purpose is making the construction be technically advanced,
economically fitted, safe and reliable. In order to be able to properly understand and
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 41 of 50
2.3.4 For the pipe fittings and fasteners used in acid environment, normally, surface
treatment shall be done according to the design requirements.
2.3.7 Requirements for inspections and tests on high-pressure bolts and nuts.
2.3.8 Inspection items and dimensions for tees for inspection and size requirement to
allowable deviation
2.3.9 Inspection and quality requirements of channel elbows; the emphasis is the
requirements of size of termination surface of the elbows.
2.3.10 Inspection and quality requirements of siphons.
2.3.11 Inspection and quality requirements of reductors.
2.3.12 Inspection and quality requirements of supporting suspended frame.
2.3.13 Inspection requirements of compensator; one of the item here refers to the qlt
requirements for the quality of the elbows or syphons used for forming the
compensator.
4.4 Valves
2.4.2 All valves should be inspected for their appearance according to this item of
regulation.
2.4.3 For valves produced according to relative national standards, the tests and
inspections should be conducted according to this item of regulation. For valves
manufactured according to relative standards like API, they can be directly installed
without conducting the test on intensity and leakproofness when they arrive at worksites without any other damage for their inspections and tests are already done in the
manufacturers’ according to relevant regulations.
2.4.4 Commission regulation to safety valves.
3. Lay-off of pipes and process of pipe fittings
1.1 Lay-off of pipes
1.1.1. In order to guarantee the intensity of pipes used in high-pressure condition, we’ve
typically proposed that the method of mechanical cutting should be applied. For
the pipes of large diameters, if there's any difficulty with the method of mechanical
cutting, other methods of cutting can be adopted for the purpose of guarantee of
the quality.
2.1.2. The purpose that we propose in this item is to guarantee the matching quality and
to avoid plagiostome grouping.
1.1.1. This item is typically proposed to guarantee the quality of assembly and toguarantee that the pipes are placed exactly horizontally and vertically.
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Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 42 of 50
1.1.1. When pipes and fittings of different thicknesses are matching into pairs, it’s
required that the inside wall should be even and tidy. When the internal diameters
are different, they should be processed as required. When thickness differential of
outside walls are pretty large, the surface of joining points should be processed to
be smooth and round.
2.2 pipe fitt ing process
4.3.7 Grouping of pipesshould be in accordance with requirements of relevant rules.
When the thickness differential rate is large, they should be modified and grinded
to be smooth enough to joint each other. The modified and grinded wall
thicknesses should meet the design requirements.
4.3.8 This item is quoted from the American standard of ANSI/ASME B31.1. When the
correct operation is there, syphon fabrication according to the minimum
thicknesses specified in the table of the standard can meet the design
requirements.
4.3.9 This item is quoted from the American standard of ANSI/ASME B31.1 and B31.3.
Because that, currently, there are not regulations for such standards in our country
for identifying corresponding widths of samples according to nominalpipe diameter
in term of allowed extension rate for all kinds of materials. Therefore, this item
shall be applied according to such American standards.
4.3.10 This item is modified from the American standard of ANSI/ASME B31. Out of roundness is not regarded as a parameter with quality requirement.
4.3.11 This item is proposed according to relevant contents of GB50235.
4.3.12 After syphon fabrication with high-pressure pipes, surface damage detection test
should be done. If it needs heat treatment, the test should be conducted after heat
treatment.
4.3.13 We currently seldom use fabrication for pipe reeling process, pipe reeling, jacket
pipe in construction of oil projects. No requirements are proposed in this cretarion.
National standards shall be applied directly.
4.3.14 For fabrication of manifold, seamless pipes should be used. When jointing the
manifold into pairs, their sequences should be paid attention.
4. Pipeline installation
4.1. General regulations
5.3.8 There are many cross-operations for installation of station field process pipeline;therefore, we should have careful inspection before any installation to guarantee
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).
Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC
SY 0402-2000Page 46 of 50
6.0.2 In order to guarantee the quality of pipeline laying work, quality inspection should
be conducted for formed Pipe Trench; dimensions of Pipe Trench should be
correct; tunnel bottoms should be even; slopes should be of the same standard;
there should be no stagnant water and collapse on tunnel bottoms.
6.0.3 Requirements are proposed for full dimensions of Pipe Trench;in order to avoid
pipelines from becoming suspended and having blockage in suspended sections,
the widths of tunnel bottoms should be made sure that they are of the required
standard.
6.0.4 Eliminate stagnant water in Pipe Trench to ensure that pipelines are closely sat on
tunnel bottoms.
6.0.5 Outside force to pipelines should not exceed yield limit of pipelines themselves; in
order to prevent pipelines from being damaged with received stress, the
suspended sections should be filled with soil.
6.0.6 Proposed the work which should be completed before backfill of Pipe Trench;backfill of Pipe Trench shall not be conducted until non-destructive test and leak
detection of anti-corrosion coating are completed.
6.0.7 In order to prevent damage to the anti-corrosion coating of pipes , avoid
generation of additional stress on the suspended sections and recover
physiognomy, this item is proposed.
7 Purge and Pressure Test of Pipeline System
7.1. Requirements before purge and pressure test
7.1. 1 Purge is to guarantee the inside of the system is clean; in order to have safe
production, inspection on part of welding lines shall be conducted if necessary.
7.1.2 In order to ensure that the installation is correct, this item is proposed.
7.1.3 In order to ensure veracity of quality inspection and to have convenience of
reformation and modification to problems that may possibly happen, this item is
proposed.7.1.4 To guarantee precision and veracity of pressure test, measurement distance shall
not be too larger.
7.1.5 In order to ensure safety of pressure test and reliability of test result, a scheme for
purge and pressure test shall become effective after it is reviewed and approved
by the client and supervisor.
7.1.6 Ensure a clean inside of the system; prevent equipments from being damaged as
well as possible.
7.1.7 Guarantee that pressure test result is correct and water doesn’t exist in pipeline
system.
7.1.8 In order to ensure that the system can work normally, pressure tests shall be taken
7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).