sy 0402-2000 std constr. & accep. of oil & nat gas station proc. pl prjct. (eng)

7/29/2019 SY 0402-2000 Std Constr. & Accep. of Oil & Nat Gas Station Proc. PL Prjct. (ENG).

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Standard for Construction and Acceptance of Oil and Natural Gas Station Procedure Pipeline ProjectChina Petroleum Standardization Committee CPSC

SY 0402-2000 of 50

Industrial Standard of Oil and Natural Gas of the People's Republic of China

Standard for Construction and Acceptance of Oil and Natural Gas

Station Procedure Pipeline Project

SY 0402-2000

Major Editor Unit: No. 1 Engineering Company of China Petroleum Pipeline

Engineer Corporation

Department of Approval: State Petroleum and Chemical Industrial Bureau

Petroleum Industry Press

2000 Beijing




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Table of Contents

1 General Regulations ..............................................................................................................4

2. Inspection of Pipeline Components .....................................................................................5

2.1 General rules.............................................................................................................5

2.2 Pipe Materials...........................................................................................................5

2.3 Pipe Fittings and Fasteners........................................................................................5

2.4. Valves........................................................................................................................9

3. Lay-off of pipe and process of pipe fittings .......................................................................11

3.1. Lay-off of pipe........................................................................................................11

3.2 Process of pipe fittings............................................................................................13

4. Pipelines Installation ............................................................................................................21

4.1 General regulations.................................................................................................21

3.3 Valves Installation...................................................................................................265. Welding ..................................................................................................................................26


5.2 Welding...................................................................................................................27

5.3 Welding heat treatment............................................................................................28

5.4 Inspection and Acceptance to Welding Lines..........................................................29

6. Excavation and Backfill for Pipe Trench............................................................................31

7. Purge and Pressure Test of Pipeline System...................................................................32

7.1. Requirements before purge and pressure test..........................................................32

7.2 Purge.......................................................................................................................33

7.3. Pressure test.............................................................................................................33

8 Anti-corrosion and heat preservation ................................................................................34


8.4 Painting...................................................................................................................34

8.5 Heat preservation....................................................................................................35

9. Handover,inspection and acceptance ...............................................................................36

Description of standard wordings and terms ............................................................................37

Attachments ..................................................................................................................................38

Description of Revision................................................................................................................38

1 General ..................................................................................................................................392 Inspection of pipeline components ....................................................................................40

2.1 2.1General regulation..............................................................................................40

7.3. Pipe materials..........................................................................................................40

2.3. Pipe fittings and fasteners.......................................................................................40

4.4 Valves......................................................................................................................41

3. Lay-off of pipes and process of pipe fittings .....................................................................41

1.1 Lay-off of pipes.......................................................................................................41

2.2 pipe fitting process..................................................................................................42

4. Pipeline installation ..............................................................................................................42

4.1. General regulations.................................................................................................42

2.2 Pipeline installation.................................................................................................43




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3.3 Installation of valves...............................................................................................43

5 Welding ..................................................................................................................................44


2.2 Welding...................................................................................................................44

5.3. Welding heat treatment............................................................................................45

5.4. Inspection and acceptance of welding lines............................................................45

6 Excavation and Backfill for Pipe Trench............................................................................45

7 Purge and Pressure Test of Pipeline System...................................................................46

7.1. Requirements before purge and pressure test..........................................................46

7.2. Purging....................................................................................................................47

3.3 Pressure test.............................................................................................................47

8 Anti-corrosion and heat preservation ................................................................................47

8.1 General regulations ...............................................................................................................47

8.2. Painting...................................................................................................................488.3. Heat preservation....................................................................................................48

9 Handover, inspection and acceptance of work................................................................48




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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.




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2. Inspection of Pipeline Components

2.1 General rules

3.1.1 All components should be inspected according to the design requirements on

specification, material and product type.

3.1.2 The components should be provided with product quality certificates, factory test

qualification certificates and instruction books. If any doubt rises, another

inspection should be taken according to supply contracts and product standards.

Their performance indexes should be consistent with relevant regulations of

current state or industry criteria.3.1.3 Appearance check should be completed before using any component. The

appearance quality should abide by relevant regulations on design and

manufacture.

2.2 Pipe Materials

2.2.1 Pipe materials of special requirements should be purchased according to their

design requirements and inspected according to such requirements.

2.3 Pipe Fittings and Fasteners

2.3.1 Dimension deviations in such pipe fittings as elbows, reductors, tees, flanges,

gaskets, blind flanges, compensators, as well as fasteners should be in accordance

with relevant regulations of current state or industrial criteria.

2.3.2 To check the quality certificate before using the fittings and fasteners and confirm

that the following items abide by relevant regulations of state or industrial technology

criteria.

1. Chemical compositions.2. Mechanical performance after heat treatment.

3. Meatallogy analysis reports for alloy pipe fittings.

4. Nondestructive inspection reports for fittings and fasteners.

2.3.3 Technical requirements for high pressure fittings and fasteners should be in

accordance with relevant regulations of PN16.0-32.0MPa Technical requirements for

Forging Angle High Pressure Valves, Fittings and Fasteners, JB 450.

2.3.4 Quality of the flanges should meet the following requirements.

1. Seal surface of flange should be smooth and flat and free of burr, nick, radial groove,

sand hole and air hole as well.

2. No gouge at rear groove of buttweld flange.

3. No broken screw thread of threaded flange.




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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.




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6. Appearance quality of welding line of stiffener should meet design requirements.

7. Inspection of drawing tee should be done according to design requirements, such as

wall thickness, thickness reduction value.

2.3.9 Inspection and quality of elbow should meet the following requirements:

1. There should be no crazing, delamination, fold, over-burn and other defects.

2. Thickness reduction value of elbow wall thickness is less than 10% of the wall

thickness.Actual thickness checked out should be no less than that of design.

3. Elbow chamfer angle is 35°±5°, root face is 1.0-2.0mm.

4. End face variation, elbow angle variation and roundness, curvature semidiameters

variation of the elbow should meet the following requirements in Table 2.3.9

Table 2.3.9 Permiss ible variation for elbowing angle of elbows (mm)

Nominal diameter Inspection

item 25-65 80-100 125-200 ≥250Variation of

end face

≤1.0 ≤1.0 ≤1.5 ≤1.5

Variation of

curvature

semidiameters

±2 ±3 ±4 ±5

Variation of

elbow angle

±1° ±1° ±1° ±1°

Roundness

variation

≤1% of nominal diameter

2.3.10 Inspection and quality of elbow should meet the following requirements.

1. Both inside and outside surfaces should be smooth and free of crazing, scar, fold,

raising spot and other defects.

2. Variation of elbow dimension should meet the regulations in Table 2.3.10.

Table 2.3.10 Permissible variation of elbow and reducer (mm)

Nominal diameter Inspection

item 25-70 80-100 125-200 250-400 500 600 700

variation

of

external

diameter

±1.0 ±1.6 ±2.0 ±2.5 ±3.0 __ __




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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.




SY 0402-2000 of 50

1. Roundness of elbowed pipe of TT-type and Ω-type compensator should be no more

than 8% of external diameter. Wall thickness reduction value should be no more than

15% of nominal wall thickness and actual wall thickness should be no less than the

design wall thickness.

2. Permissible length variation of cantilever of TT-type compensator is ±10mm. Plane

warping per meter should be no more than 3mm and no more than 10mm for the total

length.

2.4. Valves

2.4.1 Valves should be supplied with qualification certificates. Installation instruction

books should come with eletrical valves, pneumatic valves, hydraulic valves, valves

driven by air and fluid, pneumatic-hydraulic valves, electrical-hydraulic valves,

electromagnetic-hydraulic valves and so on.

2.4.2 Valve appearance inspection should be done prior to inspection of valve. The

appearance quality should meet the following requirements:

1. Body, cap and external surface of a valve have no air hole, sand hole, crazing or other

defects.

2. Internal surface of valve body should be smooth and clean. Wedge, ball surface as

well as other matching faces should have no scratch, recession and other defects.

3. Gasket and packing should meet medium requirements and be installed correctly.

4. Bolt, joint flange as well as external and internal threads should meet the technical

requirements.5. Stem, hand wheel and handle have no burr or nick; and conveying device operates

easily; indication is correct and have full load.

6. Other valves (of electrical, pneumatic types and so on) and all kinds of parts are in

good state without loosing phenomena.

7. The brand label is in good state and marks are right and complete.

2.4.3 Test to valve density and sealing effect should meet the following requirements.

1. Accuracy grade of pressure gauge of testing pressure should be no less than Grade

1.5; and the gauge should be tested and calibrated to be qualified.

2. The range of valve inspection: randomly picking 10% of each batch of valves which

are of nominal diameters no more than 50mm and nominal pressure no more than

1.6MPa and at least 1 of a batch should be tested; if there is any unqualified valves,

randomly pick 20% or more; if there is still any unqualified valves, inspect the valve

one by one. All the valves of nominal diameters more than 50mm and nominal

pressures more than 1.6Mpa should be fully inspected.

3. Density and seal of valve should be tested with clean water. Pressure for density test

is 1.5 times as much as its working pressure, keeping a stable pressure for no less

than 5min. No seepage, deformation or damage is found in the hull, gasket as well as

packing. If the readout value on the pressure gauge doesn’t fall down then the valve is

qualified. Pressure for seal test is working pressure, keeping stable pressure for 15min. Zero inside seepage and falling readout means qualified.




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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.




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3. Lay-off of pipe and process of pipe fittings

3.1. Lay-off of pipe

3.1.1 Mechanical cutting is suitable for pipes to be used under high pressure.

Oxygen-acetylene cutting is suitable for pipes to be used under low-mid pressure.

After cutting, remove oxidized layer of the pipe, wipe off arc corrugation at the cut and

process the chamfer according to requirements.

3.1.2 Cut quality of pipe should meet the following requirements:

1. Cut surface should be smooth and free of crazing, lap, burr, raising, dent, shrinking hole,

slag, oxid or scrap.2. Oblique deviation (Figure 3.1.2) of cut end face should be no more than 1% of

external diameter of the pipe and no more than 3mm.

Figure 3.1.2 Oblique deviation of cut end face

3.1.3 Pipes become elbowed for transit and piling up should be made straight before

use. The linearity is no more than 1.5mm for each meter, less than 5m for total

length.

3.1.4 Chamfer type of pipe end and dimension of grouping should meet the

requirements in Table 3.1.4




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Table 3.1.4 Chamfer type of pipe end and dimension of grouping

Chamfer

dimension

Root face

p

Name Chamfer

type

Wall

thickness(mm)

angle

(mm)

Grouping

space b

(mm)

Weld

upward

1-2.0

Weld

upward

1-2.5

Weld

downward

Weld

downward

＜9 70°±5°

1-1.5 1-2.0

Weld

upward

1-2.0

Weld

upward

1-2.5

Weld

downward

Weld

downward

Pipe

matching

and joining

≥9 60°±5°

1-1.5 1-2.0

Weld

upward

1-2.0

Weld

upward

1-2.5

Weld

downward

Weld

downward

＜9 70°±5°

1-1.5 1-2.0

Weld

upward

1-2.0

Weld

upward

1-2.5

Weld

downward

Weld

downward

Joining

without

consideration

of wall

thickness

≥9 60°±5°

1-1.5 1-2.0

Weld

upward1-2.0

Weld

downward

＜9 70°±5°

1-1.5

Weld

upward

1-2.0

Weld

upward

1-2.5

Weld

downward

Weld

downward

Different pipe

wallsmatching

≥9 60°±5°

1-1.5 1-2.0




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Horse-ride

one-way

joining

branch pipe

≥6 50°±5° 1.0-1.5 1.5-2.5

bell and

socket

one-way

joining

branch pipe

≥6 50°±5° 1.0-1.5 1.5-2.5

3.2 Process of pipe fittings

3.2.1 When connecting two pipes, thickness differential rate should meet the requirements

in Table 3.2.1.

Table 3.2.1 Thickness d ifferential rate of pipe (mm)

Pipe thickness Thickness differential rate of

inside wall

Thickness differential rate of outside

wall

＞10 1 2.0-2.5

5-10 10% of wall thickness 1.5-2.0

＜5 0.5 0.5-1.5

3.2.2 Fabrication of elbow should follow the requirements bellow:

1. For fabrication of elbow, it’s suitable to adopt the pipe whose wall thickness is positive

tolerance. When adopting pipe of negative tolerance in thickness, the relationship

between elbowing semidiameter and wall thickness of the front pipe should meet the

requirements in Table 3.2.2.

Table 3.2.2 Relationship between elbowing semidiameter and wall thickness of the

pipe in front o f the elbow Elbowing semidiameter R wall thickness of the pipe in front of the

elbow

R≥6Dn 1.06Tm

6Dn＞R≥5Dn 1.08Tm






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Note:

1. DN indicates nominal diameter (mm).

2. Tm indicates design thickness of wall (mm).

2. The elbowing semidiameter of high pressure pipe is suitable to be more thant 5 times

as much as external diameter of the pipe. Elbowing semidiameters of other pipes are

stable to be more than 3.5 times as much as the external diameter of the pipe.

3. When adopting seam pipe for elbow fabrication, weld line should avoid tension

(pressure) zone.

4. The pipe should be either coldly or hotly elbowed according to the characteristic of its

material property.

5. When adopting hi-alloyed pipe for elbow fabrication, it is stable to be conducted in

mechanical ways. When fabricating elbow with sand fill, the method of hammer strike

shouldn’t be applied.

3.2.3 Heat treatment for the pipe being elbowed either coldly or hotly should meet the

following requirements:

1. Except for the situation that the temperature for elbow fabrication is constantly

kept above 900. After fabricated elbow with carbon steel of the thickness over

19mm, heat treatment should be done according to the requirements in Table

3.2.3.

2. When adopting low-alloyed and mid-alloyed steel listed in Table 3.2.3 for hot

elbowing, the steel with nominal diameter no less than 100mm or wall thickness

no less than 13mm should, according to design requirement, be processed in the

methods of complete de-tempering, increase of temperature and tempering or

tempering.

3. When adopting low-alloyed and mid-alloyed steel listed in Table 3.2.3 for cold

elbowing, the steel with nominal diameter no less than 100mm or wall thickness

no less than 13mm should be elbowed coldly according to the requirements in

Table 3.2.3.

4. When adopting austenitic stainless steel pipe for elbow fabrication, heat

treatment can be ignored. When heat treatment is required in design document, it

should be done according to the design document.

Table 3.2.3 Heat treatment cond itions for frequently used pipes

Pipe type nominal

compositi

on

Steel

grade

Heat

treatment

temperat

ure

Heating

speed

Constant

temperatu

re time

Cooling

speed




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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.




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Figure 3.2.4 Elbow angle and center variation of pipe end

5. For the elbow with design pressure less than 10Mpa, on any section, the largest

external diameter minus the smallest external diameter should equal to the result

which should be no more than 8% of external diameter of the front pipe .

6. For other elbows, the difference of wall thicknesses of the pipe before and after the

fabrication should no more than 15% of the external diameter of the pipe before the

fabrication, and should be no less than design wall thickness of the pipe; center

variation of the piper end should be no more than 3mm/m; when length of strainght

pipe exceeds 3m, the variation value should be no more than 10mm.

3.2.5 Permissible flatness variation value “⊿“ of TT-type elbow should meet the

requirements in both Table 3.2.5 and Figure 3.2.5Table 3.2.5 Permiss ible f latness variation value of TT-type elbow (mm)

length 500 500-1000 ＞1000-1500 ＞1500

Flatness(平面度) ≤3 ≤4 ≤6 ≤10




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Figure 3.2.5 Flatness of TT-type elbow

3.2.6 Elbow fabricated with high-pressure steel pipe needs nondestructive detection of

its surface. If the elbow requires heat treatment, then the detection should be done

after the treatment. When there are defects, the elbow should be grinded. Wall

thickness of the grinded elbow should be no less than 90% of the nominal wall

thickness of the pipe and no less than design wall thickness.

3.2.7 Pipe reeling process, pipe reeling, jacket pipe as well as their quality should meet

the requirements in Rules of Construction and Acceptance for Industrial Metal

Pipeline Work GB 50235.

3.2.8 Fabrication and quality of manifold should meet the following requirements:

1. For manifold fabrication, it is stable to use integral seamless pipe. If join pipes in the

method of buttweld, longitudinal seam or spiral weld line should be set apart over

100mm. For the spiral weld seam pipe, compensatory weld should be done at spiralweld line of the pipe end and the length should be no less than 20mm.

2. Drawing lines on the parent pipe for manifold should meet the following requirements.

1) Fix the pipe and draw central line.

2) Draw tapping center and tapping line according to design requirement.

3. If manifold adopts horse-ride joining method, tapping diameter of the pipe should be

2mm less than the internal diameter of the branch pipe.

Chamfer of branch pipe and angle joint should meet the requirements in Table 3.2.8-1 and

Figure 3.2.8

Table 3.2.8-1 Chamfer of branch pipe and angle join t dimension




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Joint angle

Item 90°-105° 105°-150°

angle formed by

saddle and branch

pipe 45° 45°-90°




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Continued

Joint angle

Item 90°-105° 105°-150°

Oblique ā 45°-60° 60°

Root space

b(mm) 1.5-2.5 1.5-2.5

Root face p(mm) 0-1.5 0-1.5

Figure 3.2 8 Chamfer angle of branch pipe

4. When connecting the manifold in the bell and socket method, the parent pipe should

be tapped and the chamfer should be processed. Chamfer angle is 45°-60°, the

permissible variation is ±2.5°, the space between the hole and the external diameter

of branch pipe is 0.5-2mm. The bell and socket depth of branch pipe should be less

than inside wall thickness of the parent pipe.

5. When matching pair of manifolds, firstly get branch pipes matched with flanges. When

matching parent pipe with branch pipe, firstly get the branch pipes matched with both

ends of the parent pipe and make sure they are paralleled with each other and vertical

to the parent pipe. Then take the two branch pipes as the standard of such grouping

and continue the grouping of other pipes in between them.6. When matching pair of manifolds, if nominal diameter of branch pipe is no more than

200mm, set 4 welding points; if nominal diameter is over 200mm, set 6 welding points,

which are distributed uniformly.

7. Permissible variation of manifold grouping should meet the acquirements in Table

3.2.8-2.




SY 0402-2000 of 50

Table 3.2.8-2 Permissible variation of grouping of pipes

No. Item

Permissible

variation（mm)

1 Total length of parent pipe ±5

2 Branch pipe spacing ±3

3

Relative central line deviation of branch pipe and parent

pipe ±1.5

4 Length of extending pipe to flange of branch pipe ±1.5

≤300 ≤1

5

Linearity and

verticality of flange Branch pipe diameter 300 ≤2

≤100 ≤L/100,Max1.5

6 Linearity of parent pipe

Nominal diameter of

parent pipe ＞100 ≤2L/100,Max1.5

Note: L indicates total length of parent pipe (m)

8. Before welding the pair matches , inside of the manifold should be cleaned, grouping

weld should meet the requirements of the design drawing.

9. Quality of manifold weld should comply with the regulations in Chapter 5 of this

criterion.




SY 0402-2000 of 50

4. Pipelines Installation

4.1 General regulations

4.1.1 Before installing the pipelines, construction drawings of the process pipelines

must pass relevant specialized joint review on the aspects of civil engineering, electric,

instrument, water supply and drainage,etc., especially that the buried pipelines, buried

cables, water supply and drainage pipelines, underground devices and the positions

of pre-evacuated holes shall be checked.

4.1.2 The civil engineering relative to pipelines installation shall pass the inspection

and acceptance and achieve the installation conditions.

4.1.3 The pipe materials, pipe fittings, valves and other prefabricated pieces used for

process pipelines shall pass the inspection according to this cretarion.

4.1.4 The equipments, pipe racks and pipe piers connected to the pipelines shall be

aligned, and the slope aspect and degree of pipe racks and pipe piers shall comply

with the design requirements after the completion of installation and fixing.

4.1.5 The interior of pipes, pipe fittings and valves, etc. shall be clean and have not

any pollution or sundries. The mouth of pipes and the inlets and outlets of the valves shall

be sealed timely if there are some interruptions during installation work.

4.1.6 After passing the inspection of group welding of buried pipelines, pressure test,

anti-corrosion treatment and backfilling should be done timely. Before backfilling, the

procedures for inspection and acceptance of hidden projects should be completed.

4.1.7 Holes are unsuitable to be opened at the welding lines or edges of pipelines,

however, if that is inevitable, the openings within the range of 1.5 times of the opening

diameter shall be compensated, and the welding lines covered by compensation plates

shall be ground smooth. The quality inspection of welding lines shall comply with the

regulations in 5.4.

4.2 Pipelines ins tallation

4.2.1 Prefabricated pipelines shall be installed according to the system number andsequence number of each pipeline.

4.2.2 Joints shall not be forcefully matched when connecting pipelines, pipe fittings,

valves and equipments, etc.

4.2.3 Before installing, matching conditions of valves, flanges and pipelines shall be

checked as follows:

1. When welding buttweld flanges and pipes in pairs, their internal diameters shall be

checked if they are coincident. If they are not coincident, an internal groove shall be

made according to the requirements.

2. The matching condition of flat-welded flanges and pipes shall be checked.

3. The matching condition of flanges and valve flanges and lengths of fittings shall be




SY 0402-2000 of 50

checked to prevent non-matching condition.

4.2.4. Check if the internal diameters of tees and elbows are coincident with the

diameters of connected pipes. An internal groove shall be made if they are not

coincident.4.2.5. The diameter of reductors shall be coincident with the pipe segment to be

connected to them and the thickness differential rate of the matching shall not be

lager than 1.5 mm.

4.2.6. The pipelines shall be group welded by using matching device when installing. In

the case of using external matching device, the matching device can be dismounted

only after finishing root pass welding 50% of the perimeter of required pipelines and

the welding is uniformly distributed; in the case of using internal matching device, the

matching device can be dismounted only after finishing root pass welding completely.

4.2.7. The roundness of pipe port shall be regulated when in the case that theroundness exceeds standard. A reshaper can be adopted for regulating the

roundness, rather than using the method of hammer striking.

4.2.8. The flatness of the pipelines shall be checked when connecting, and the flatness

shall be measured at a distance of 200 mm from the joint center, the permissible

variation shall be 1 mm in the case that the nominal diameter of pipes is smaller than

100 mm; and the permissible variation shall be 2 mm in the case that the nominal

diameter of pipes is larger than or equal to 100 mm. However, the permissible

variation of the whole pipe shall be 10 mm.

4.2.9. When buttweld the pipes helically, the helical welding lines shall be staggered by

100 mm or more.

4.2.10. Protection pipes shall be added in the case of the pipe passing through buildings.

The central line of protection pipes and pipelines shall be coincident and there shall

be no welding line of buttweldat concealed place in a building.

4.2.11. Permissible variations of installed pipelines shall be in accordance with the

regulations in 4.2.11.




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Table 4.2.11 Permissible variations of installed pipelines

ItemPermissible

variation (mm)

Overhead ± 10

Trench± 7

Coordinate(座标)

Underground

± 20

Overhead ± 10

Trench ± 7Elevation

Underground± 20

DN≤100 mm≤

2L/1000

Max.

40Flatness

DN> 100mm≤

3L/1000

Max.

70

Vertical degree≤

3H/1000

Max.

25

Row upDistance on the same

plane± 10

Crosswise

Distance between

external wall of pipes

or thermal insulating

layers

± 7

4.2.12. Fixed weld junctions of the pipelines which connect to machines shall be far

away from the machines. As to the machines which are not permitted to bear

additional external force, the connections between pipes and machines shall comply

with the following regulations:

1. Parallelization and concentricity of flanges shall be checked when the pipeline is

under a free condition, and the permissible variation shall comply with the regulations

in Table 4.2.12.

Table 4.2.12. Parallelization, concentricity, permissib le variation of flanges

and displacement of equipment

Rotate

speed of

pump

(r/min)

Parallelization

(mm)

Concentricity

(mm)

Displacement

of equipment

(mm）




SY 0402-2000 of 50

3000-6000 ≤0.10 ≤0.50 ≤0.50

> 6000 ≤0.05 ≤0.20 ≤0.02

2. When tightening bolts, displacement of equipment shall be observed by using a dial

indicator on the main coupling of equipment. The readings should be complying with

the regulations in 4.2.12.

4.2.13 Pipeline compensator shall be pre-stretched (pre-compressed) before installing

according to design regulation before installing, with the permissible variation of ±

10mm.

4.2.14 The types and specifications of rack, bracket, suspended frame and pipe clamps

shall be selected according to design, the installing position shall comply with the

design requirements with correct installing method. Make sure the sliding rack can

slide along the axial direction without any horizontal variation; fixed racks shall be

installed firmly.

4.2.15 The sealed surface of flange shall be vertical with the center of pipe (Fig. 4.2.15).

The permissible variation (e) of external diameter of flange shall be ±1 mm in the case

that the nominal diameter is smaller than or equal to 300 mm; and the permissible

variation (e) of external diameter of flange shall be ±2 mm in the case that the nominal

diameter is larger than 300 mm.

Fig. 4.2.15 Variation of prefabricated pipe segment

4.2.16 The blot hole of flange shall be mid-span installed. In the case that there are

flanges on both ends of pipeline, the flange on one end shall be aligned with leveling

ruler after being welded to pipeline, the flange on the other end shall be aligned in the

same way. The flatness of the hole shall be smaller than 1 mm.The distance between

pipe end and the sealed surface of flat welded flange shall be 2-3 mm larger than the

thickness of pipe wall.

4.2.17 The flange shall maintain parallel when connecting, with the variation no larger

than 1.5/1000 of the external diameter of the flange and no larger than 2 mm. The pad

shall be placed at the center of sealed surface of flange, without any inclination or

diving into the pipe. As to the flange with stair groove or rough sealed surface, the pad

shall be placed in the groove.

4.2.18 Each pair of flanges shall be connected with the bolts of same specifications, and

the installing direction shall be uniform. Bolts shall be tightened according to

symmetrical sequence. All bolts shall be tightened firmly, and the force shall be evenand all the bolts should be treated.




SY 0402-2000 of 50

4.2.19 After tightening the bolts of flanges, the two sealed surfaces shall be parallel and

shall be symmetrically checked with ruler, the permissible variation of clearance shall

be smaller than 0.5 mm.

4.2.20 The flange shall be connected at the same axis with pipeline, the permissible

variation of the bolt holes center shall not exceed 5% of the hole diameter, and the

bolts shall maintain to be able to pass through freely. After tightening the bolts of

flanges, 2-3 teeth shall be exposed outside of the nuts, the screws shall be regulated if

they do not comply with the regulations.




SY 0402-2000 of 50

4.2.22 When twisting the screw flange into the short end of screw, the chamfer of screw

shall expose outside, and the metal pad shall be embedded into the sealed base.

4.3 Valves Installation

4.3.1 Before installing valves, the packing materials of valves shall be checked, and the

regulation remaining amount shall be reserved for gland bolt.

4.3.2 Before installing valves, the model shall be checked according to the design

document, and the installation direction shall be determined according to the flow

direction of medium, and the conformity certificate of product and test records

shall be rechecked.

4.3.3 When connecting the valve and pipeline with the type of flange or screw, the valve

shall be closed.

4.3.4 When connecting the valve and pipeline with the type of welding, the valve can not

be closed, and the quality of welding lines shall be ensured.

4.3.5 When installing valve, the installing direction of valve shall be determined

according to the flow direction of medium, and the valve shall avoid massive

installation. When installing the double-ram valves on level pipe segment, the

hand wheel shall be upwards. Generally, the hand wheel or handle shall not be

installed in a downward direction, and shall be installed at the position convenient

to operate and repair according to the features of vales and the flow direction of

medium.

4.3.6 When installing safety valve, the following regulations shall be followed:

1. Check the verticality, and regulate it timely in the case of inclination.

2. The final regulation of safety valve is suitable to be performed on the system. The

startup pressure and seat returning pressure shall comply with relevant

regulations in design documents and this document.

5. Welding


5.1.1 When welding pipes at station field, this chapter and the current industrial

standard Welding, Inspection and Acceptance of Welding Work for Pipes,

namely SY/T 4103 and relevant regulations should govern such work.

5.1.2 In pipe welding production, for any type of steel which is used for the first time,

the welding materials and methods should be be accessed. Welding technique

test and assessment should be comply with the regulations in Chapter 5 of

Welding, Inspection and Acceptance Rules for Steel Pipeline SY/T 4103.5.1.3 When using assessment results of insulation companies’ existing welding




SY 0402-2000 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

measure, you mustn’t conduct any welding work:

1. running day or snowing day;

2. atmosphere relative humidity exceeds 90%;

3. wind speed exceeds 2.2m/s gas shielded welding; wind speed exceeds 8m/s manual

electric welding with flux coated welding rod; wind speed exceeds 11m/s

self-protection welding with flux-cored wire;

4. when the environment temperature is lower than temperatures stated in welding

regulations and procedures;5. lowest allowed environment temperature for regular pipe materials: -20for mild




SY 0402-2000 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.




SY 0402-2000 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




SY 0402-2000 of 50

certificate or higher levels of certificates.

5.4.4. Grading for inspection and acceptance and ratio of nondestructive inspection

should be subject to design requirements. The following regulations should apply if

there’s no such regulation in the design requirements.

1. Number of tests of nondestructive inspection and passing grades of buttweld weld

lines of pipelines should be in accordance with the regulation in 5.4.4 of this cretarion.

2. 100% ray photography check should be done to welding lines of pressure-tested

connected joints and welding lines of pipelines that go through roads of the station

field.

3. For welding to the spots where ultrasonic or ray destructive inspection can’t be done,

penetration or magnetic particle test should be done according to Rules of

Construction and Acceptance for Industrial Metal Pipeline Work GB 50235. If no

defect is found, the test is passed.

Table 5.4.4 Number of tests and passing grades ( 合格等级 ) for welding line

nondestructive inspection

Ultrasonic destructive test Ray destructive test

Design pressure

(Mpa)

Spot check

rate (%)

passing

grade

Spot check

rate (%) passing grade

p 16 - - 100 II

4.0 p≤16 100 II 10 II

1.6 p≤4.0 100 II 5 III

p≤1.6 50 III - -

5.4.5 Spot check, test and inspection to welding lines should be random and

representative; or designated by the supervisor. Percentages of number of re-tests or

spot checks for each welder or flow process team should be roughly equivalent.

5.4.6 For removal of defects and rework of welding items that don’t meet the quality

requirements, the regulation of Chapter 10 of Welding, Inspection and Acceptance of

Welding Work for Pipes SY/T 4103-1995 should apply.




SY 0402-2000 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




SY 0402-2000 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




SY 0402-2000 of 50

value of the thermometer used for the pressure test shall not be smaller than 1ºC.

7.1.5 When making plan for purge and pressure test, effective safety measurements

shall be adopted and the plan shall be implemented after being reviewed and approved by

the client and supervisor.

7.1.6 Before purging, the orifice plate of throttle device in the system must be taken out,

the regulating valves and throttling valves must be dismounted and the connection

component shall be replaced by nipples and elbows.

7.1.7 High-point exhaust valve and low-point drainage valve shall be installed for

hydraulic test.

7.1.8 When testing pressure, pipelines with different pressure grades shall not be

tested together.

7.1.9 At least two pressure gauges shall be installed for each pressure test system;

they shall be placed at the high point and low point of a pressure testing segment

separately.

7.2 Purge

1.2.1 Velocity of flow of pipeline purge gas should be larger than 20m/s.

7.2.1 Dirt purged from pipelines shall not go into equipments and the dirt purged from

equipments shall not go into the pipelines.

1. The system shall be purged before and after testing pressure. When the blowing gas

is free of any dirt such as rust, dust, stones or waters, the purge shall be qualified.

The system shall be sealed timely after passing inspection.

7.3. Pressure test

7.3.1 When temperature of the environment is lower than 5ºC, anti-freezing measures

shall be taken.

7.3.2 Test pressure of the pipeline system shall be according to the following

regulations if there design regulations are not given:

1. Strength test pressure shall be 1.5 times of the design pressure and shall not be

lower than 0.4 MPa.

2. Leak test pressure shall be according to the design pressure.

7.3.3 In the case that near-neutral clean water is used for hydraulic test, the pressure

shall be increased slowly and the pressure shall be stabilized for 10 minutes after

reaching the strength test pressure. If it has no leak or pressure dropping, the

pressure shall be decreased to the design pressure, the leak test shall be made,




SY 0402-2000 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


8.1.1 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




SY 0402-2000 of 50

requirements; there shall be no greases, welding slag, gritty dust, water or other

pollutions.

8.2.2 Quality of painted primer shall be inspected. It shall be repaired in the case of

some damage. Prohibited to apply surface coat before primer is dry.

8.2.3 In the case of painting more than one time, time intervals shall be determined

according to characteristics of paint and mustn't exceed 14 days.

8.2.4 Under one of the following conditions, brush paint operation must not be started

unless effective measures are taken.

1 It is rainy, snowy or foggy.

2 Temperature of environment is lower than 5ºC or higher than 40ºC.

3 There is too much dust.

3. Temperature of surface to be painted is higher than 65ºC.4. Relative humidity of environment is larger than 85%.

5. Surface of pipe is moisture condensation.

8.2.5 The coating shall be repaired when the paint quality is in the following conditions:

1. There are winkles on the coating or the coating is not adhered firmly before it is

dried.

2. After completion of the painting, dropped paints, cracks, air bubbles, incorrect or

inconsistent colors or other bad conditions appear.3. The coating is broken during construction.

4. Some area of the surface to be painted is left unpainted.

8.3 Heat preservation

8.3.1 Heat preservation can only be done after surface quality inspection and

anti-corrosion test of the surface of pipe are passed.

8.3.2 In the case that pipe-shell prefabricated blocks are adopted for heat preservation,

the joints of prefabricated blocks shall be staggered and the joints of horizontal

pipes shall be located at the facial surface.

8.3.3 In the case of heat preservation of the pipelines around valve and flange, the

length of bolt and a 20 mm-long gap shall be reserved outside the flange.

8.3.4 The heat preservation of the pipelines at pipe carrier spot shall not obstruct the

expansion displacement of the pipelines and shall not damage the heat

preservation layers.

8.3.5 The quality of the heat preservation layers shall comply with the following

requirements:

1. Iron wires shall be used to bind firmly, the filling shall be compacted without any




SY 0402-2000 of 50

serious roughness, and the thickness of the heat preservation layers shall be in

accordance with the design requirements.

2. Glass cloth shall be used to for firm wrapping of the pipelines, and the glass cloth

texture shall not expose in the case of external anti-corrosion.

3. Thicknesses of asbestos-cement preservation layers shall be even and the

surfaces shall be smooth.

4. In the case that a metal sheet is adopted as a preservation layer, the bond

edgings shall be firm and the package shall be compact.

5. Permissible variations of expansion seam and surface of preservation layer shall

comply with the regulations in Table 8.3.5.

Table 8.3.5 Permissible variations of expansionsand surface of preservation layer

No. Item Permiss ible variation

Coating 10 mm

Mold of reel materials 5 mm

1 Flatness of surface

Formed products 5%

Winding products 8%

2 Thickness

Filling products 10%

3 Width of expansion seam 5%

9. Handover,inspection and acceptance

1.0.1 When a in-station process pipeline project is completed, the construction unit (or




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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”;




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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




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execute the items of the rules, this description of revision is provided according to the

order of chapters, sections and items of this document for reference of the users who use

this document.

In the usage of this document, if you found that any part of this description of revision

should be improved, please let us know by sending your comment to No. 1 Engineering

Company of China Petroleum Pipeline Engineer Corporation.

(Address: Shuangtaizi District, Panmian City, Liaoning ProvincePostcode: 124103).

No. 1 Engineering Company of China Petroleum Pipeline Engineer Corporation

December 1999

Table of Contents

1 General

1.0.1 The foundation of this modification is to satisfy the needs of industrial construction

for petroleum natural gas.

1.0.2 Understand that the sphere of application of this cretarion is for the construction

and acceptance of crafts metal pipeline project within collection and transportationstations by onshore petroleum natural gas industries.




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1.0.3 1.0.3 Description for inapplicable scope of this cretarion is given. For it is identified

that this cretarion is to be used within internal systems in term of process pipeline

project, the inapplicable scope of the former rule is to delete the distance

transportation pipeline, oil and gas transportation network and affusion pipeline

outside of the station.

1.0.4 Relationship between this cretarion and codes and laws of relevant departments

of PRC on the aspects of industry health, safety and environmental protection.

1.0.5 Constructor companies shall have corresponding qualification and should be

experienced contractors.

1.0.6 Currently, such construction shouldaccord with relevant regulations of existing

national peremptory standards. Description of the relationship with relative rules

should be given.

2 Inspection of pipeline components

2.1 2.1General regulation

2.1.1 Required that all the products provided should have the quality in accordance with

the designed documents in design documents.

2.1.2 There are two requirements for item: 1) It is stated that a manufacturer should

provide quality certification; 2) contents of such quality certification should be in

accordance with corresponding regulations of product manufacture standards.

3.1.3. Required the 100% of appearance inspection to pipeline components should be

done .

7.3. Pipe materials

2.3.1 For pipe materials to be used in extreme environment conditions (苛刻环境) (such

as medium (介质) of oil and gas with sulfur (硫) and hydrogen sulfide (硫化氢)),

ordering and acceptance work should be done according to special requirements

of such pipe materials that are proposed by the work design.

2.3. Pipe fi ttings and fasteners

2.3.2 Items need to be checked as proposed by this item. Its significance is that the

items shall be checked according to product standards; check whether the data

within the items is complete or not and whether it can meet the requirements of

such.

2.3.3 Regulates the items which need to be checked for flangeanges.




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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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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




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coordinated construction among all kinds of work.

5.3.9 No pipeline installation should be done until the foundation has met requirements

of relevant regulations in term of density.

4.1.3. - 4.1.5 Necessary preparings should be done before installation and requirements

need to be met.

6.1.6 Undergo regular procedures for inspection and acceptance.

7.1.7 Avoid overlapping of areas affected by welding heat; prevent stress concentration;

supplementary measures shall be applied when such acts are impossible.

2.2 Pipeline installation

4.2.1 The general requirement is to prevent pipeline from being connected wrongly.

4.2.2 Avoid generation of additional stress and reduction of interior stress in during

assembly process. Its purpose is to guarantee operating performance of

pipelines.

4.2.3-4.2.5 Matching of pipes shall be smooth enough for good transmission of load and

to guarantee quality of welding.

4.2.6 Ensure intensity of joints of pipes to prevent cracks from appearing at their roots.

4.2.7 Hampering is easy to generate additional stress concentration.

4.2.8 Propose requirements to dimension differential for pipe matching.

4.2.10. The propose of this item is just for the convenience of maintenance.

4.2.12 Prevent appearance of fatigue ruption fatigue ruption) of weld junctions. Guarantee

normal production. Prevent devices from being damaged by transferring additional stressand heat.

4.2.15 prevents appearance of additional stress and bad sealing effect.

4.2.17 When a pipe end and a flange are being welded, the flange surface should not be

affected.

4.2.18 Ensure no leakage after being sealed.

4.2.19 Ensure even bearing of stress and prevent impact given from bolts that are not well

secured.

P42

4.2.21 Ensure that bolt connections have met intensity requirements; prevent bolts from

getting loosen.

3.3 Installation of valves

4.3.1 Check packing materials of valves

4.3.2 Ensure correct installation of valves.

4.3.3 Prevent damage of valves.

4.3.4 Prevent arc from burning valve core and damaging the valve; ensure welding

quality.

4.3.5 Massive installation will generate additional stress; hand wheel or handle should

not be installed in a downward direction.




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4.3.6 Ensure that safe valves work normally.

5 Welding


1.1.1 There are many standards that regulate corresponding contents about welding

technology assessment, welding operation rules, procedures, tests for welders,

etc. Welding, Inspection and Acceptance Rule for Pipeline SY/T 4103 states

detailed regulations for above contents; and it can be applied for the welding of

technical metal pipeline inside the station fields. Therefore, it is quoted in thisrevision.

2.1.2 In order to guarantee welding quality and pass test and assessment in term of

welding techniques, feasibility of welding techniques shall be identified.

3.1.3 Experienced contractors generally have gained much experience. Welding

experience in the past needs to be confirmed before it is used for new welding

work. Accepted welding techniques should avoid being tested repeatedly.

4.1.4 Technical parameters of regulated welding.

5.1.5 Welders shall acquire corresponding qualification certificates. Issuers of such

certificates can be a government authority or an client or an client representative.

2.2 Welding

5.2.1 Propose requirements to welding materials.

5.2.2 According to the applications of current semi-auto welding technologies

self-protection welding with flux-cored wire applied for construction of petroleum

projects; regulations for allowed application scope of such technologies should be

added.

5.2.3 Without being regulated, the minimum temperatures of some metal materials

allowed to be welded have been listed in Item 5.

5.2.4 Remove the hazards which may generate welding defects.

5.2.5 Guarantee welding quality and convenience for carrying out welding work.

5.2.6 Channel elbows which are used for process pipeline inside the station shall be

ordered according to demands. It’s strictly prohibited to have bevel connection or

hilo grouping.

5.2.7 To add this item is for prevention of arc burning to base metal.

5.2.9-5.2.11 Welding regulations of general knowledge




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5.3. Welding heat treatment

5.3.1 For welding heat treatment, heat treatment technology should be identified

simultaneously in the test of welding techniques.5.3.2 When welding different kinds of steel materials, we should first meet the

requirements for the steel materials which are of poorer solderability.

5.3.3 Quoted from the regulations of the Construction and acceptance Crule for

Projects of Pipeline Routes for Oil and Gas Transportation SY0401, which is to

guarantee pre-heating effect.

5.3.4 Be in accordance with the requirements of welding techniques.

5.3.5 Conduct welding operation according to these regulations.

5.3.6 It is regulated by SY/T 4067-93 that pre-heating width shall be 3 times of welding

pass width; take consideration for actual situation of weld junctions of process

pipelines and be clear about the pre-heating width.

5.3.7 The requirements which should be met after heat treatment.

5.4. Inspection and acceptance of welding lines

5.4.1 Requirements for appearance quality inspection.

5.4.2 Nondestructive inspection for weld junction applied national standards before;

today, petroleum industries have already set up the corresponding standards for

nondestructive inspection - Photography of Welding Line Ray and Quality Grading for

Pipelines for Petroleum Natural Gas SY4056 and Ultrasonic Destructive Test of

Welding Line and Quality Grading for Pipelines for Petroleum Natural Gas SY4056,

which are quoted in this cretarion.

5.4.3 Requirements to nondestructive inspection test operation and qualification of

inspectors.

5.4.4 Nondestructive inspection test and inspection shall be subject to design. When

there‘s no requirements in the design, requirements for nondestructive inspection

have been proposed in this cretarion.

5.4.5 In consideration of actual situation of process pipeline installation at the station

field, spot check on all welding junctions shall be carried out; such spot check shouldbe random and representative.

5.4.6 Welding, Inspection and Acceptance Rule for Pipeline SY/T 4103 has given

regulations to rework of unqualified weld junctions, which is quoted directly.

6 Excavation and Backfill for Pipe Trench

6.0.1 Ensure that there is enough space for operation when conducting group weldingwork under the pipeline trenches; guarantee welding quality.




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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




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separately for systems of different pressure grades.

7.1.9 In order to ensure veracity of pressure test result, the front end and rare end of a

pipe or pipe within the system shall be respectively equipped with one pressure

gauge.

7.2. Purging

7.2.1 Velocity of flow of pipeline purge gas should be larger than 20m/s to

guarantee that there is not any impurity and water inside the system.

7.2.2 To prevent dirt from going to any direction inside the system, purging should

be conducted in different stages if necessary.

7.2.3 Pay attention to purge effect; successfully purged sections of the system

should be sealed in time under the permission of the supervisor.

8. Pressure test

8.2.6 When temperature of the environment is lower than 5, anti-freezing measures

should be taken.

8.2.7 Requirements are proposed for testing pressures.

8.2.8 The method of hydraulic test is proposed; pressure stabilizing time should be

guaranteed.

8.2.9 The method of pneumatic test is proposed; pressure stabilizing time depends on

the time needed for the leak detection work using vesicants. Leak detection areas

should include weld passes, active junctions and other places where there is a

possibility of air leakage.

8.2.10 For the safety of construction, repairing work with moving pressure is prohibited;

when leakage exists, repairing must not be done until decompression is

completed; and redo pressure test until test result has met its required standard.

8.2.11 Ensure the safety of pressure test; prevent accidents of ice blockage and

explosion from happening.

8.2.12 In order to guarantee that it’s clean and dry and there’s no sundries in the system,

it’s required to do purging after successful pressure test.

8 Anti -corrosion and heat preservation


8.1.1 Anti-corrosion work can only be conducted after passing leak test and appearance

inspection, which is to ensure that no leak hazards exist.




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8.1.2 Ensure that materials used for anti-corrosion and heat preservation treatment

shall be qualified products.

8.1.3 Anti-corrosion operations should be conducted according to regulations on

relevant anti-corrosion standards.

8.1.4 When doing leak detection, leak detection voltage should be guaranteed.

8.2. Paint ing

8.2.1 Before conducting anti-corrosion work, removal of rust and dirt elimination should

be done according to relevant regulations so that the anti-corrosion effect can be

guaranteed.

8.2.2 Prohibited to remove rust and apply surface caot before primer is dry.

8.2.3. Ensure total dryness and prevent damage of varnishes.

8.2.4 Under the circumstance that anti-corrosion quality can not be guaranteed, brush

paint operation shouldn’t be started unless effective measures are taken.

8.2.5 After installation of equipments, the areas which are unsuitable or easy for

painting should be pre-painted in order to guarantee anti-corrosion quality.

8.3. Heat preservation

8.3.1 Heat preservation should only be done after surface quality inspection and

anti-corrosion test are passed.

8.3.2 For convenience of construction and guarantee of heat preservation effect, this

item is proposed.

8.3.3 Take-down of parts that affect heat preservation effect and security of valves and

flanges should be prevented.

8.3.4 Safety distance between heat preservation layer of pipe carrier spot and bracket

should be kept in order to prevent damage to the heat preservation layer.

8.3.5 Requirements for the heat preservation layer are proposed; especially, thickness

of the heat preservation layer should be pay attention; prevent it from being

socked with rainwater.

9 Handover, inspection and acceptance of work

9.0.1 The methods of for work completion and its inspection and acceptance are

proposed.




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9.0.2 This item of regulation on work inspection and acceptance is established

according to the guideline of the documents originally issued: Doc. No. 541,

Temporary Regulation for Completion, Inspection and Acceptance of

Infrastructure Construction Work issued by No. 73 Construction Company of

State Construction Committee; and Doc. 984, Implementation Details for

Completion, Inspection and Acceptance of Ground Construction Work by

Administration of Petroleum Industries Department issued by No. 83 Petroleum

Construction Company of the Petroleum Industries Department.

Quoted standards

Installation of process pipeline project in station fields should comply with its design

specification and the regulations of this cretarion and the regulations of the following

national standards and industrial standards.

Seamless pipes for Low-pressure and Mid-pressure Boilers GB3087-1982

Welded Pipe for Low-pressure and Mid-pressure Fluid Transportation

GB/T3092-1993

Seamless pipes for High-pressure Boilers GB 5310-1995

Seamless pipes for Fluid Transportation GB/T8163-1987

Flange Types for Steel-fabricated Pipes GB/T9112-1988

Universal Valves, Flanges and Steel-fabricated Gate Valves for Buttweld

Connections GB/T12234-1989

Universal Valves, Flanges and Steel-fabricated Ball Valves for Buttweld

Connections GB/T12237-1989

General Requirements for Safety Valves GB/T12241-1989

Safety Valves for Direct Load Test With Spring GB/T12243-1989

Buttweld Pipe Fittings Made of Pipes GB/T13401-1992

Flanges for Large-diameter Carbon Pipes GB/T13402-1992

Rules of Construction and Acceptance for Industrial Metal Pipeline Work GB

50235-97

Rules of Construction and Acceptance for Field Equipments, Industry Pipeline

Welding Work GB50236




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Test Methods of Leak detection for Pipeline Anti-corrosion Layer

SY/T0063-1999

Rule for Surface Pre-treatment of Steel Materials to Be Painted SY/T0407-97

Steel-fabricated Buttweld Pipe Fittings SY/T0510-1998

Technical Regulations for Design of Insulation Flanges SY/T0516-1997

Photography of Welding Line Ray and Quality Grading for Pipelines for

Petroleum Natural Gas SY4056-93

Ultrasonic Destructive Test of Welding Line and Quality Grading for Pipelinesfor Petroleum Natural Gas SY4065-93

Welding, Inspection and Acceptance of Welding Work for Pipes SY/T5

Syphons of Pipes SY/T5257-91

sy 0402-2000 std constr. & accep. of oil & nat gas station proc. pl prjct. (eng)

Documents