SY 0422-1997 Oilfield Gathering and Transportation Pipeline Construction and Acceptance Specification
Some standard content:
Petroleum and Natural Gas Industry Standard of the People's Republic of China Specification for construction and acceptance of field gathering and transportation pipeline SY 0422-97 Edited by: Liaohe Petroleum Exploration Bureau Oilfield Construction Engineering Company No. 2 Approved by: China National Petroleum Corporation Petroleum Industry Press Beijing, 1998 China National Petroleum Corporation Document [97] CNPC Technical Supervision No. 698 Approving the issuance of the Technical Standard for Fusion Bonded Epoxy Powder External Coating of Steel Pipelines. Notice on Thirty-five Petroleum and Natural Gas Industry Standards
To all relevant units:
"Technical Standard for External Coating of Fusion-bonded Epoxy Powder for Steel Pipelines" and other thirty-five petroleum and natural gas industry standards (drafts) have been reviewed and approved and are now approved as petroleum and natural gas industry standards and are hereby promulgated
The numbers and names of the various industry standards are as follows: Serial Number
1SY/T 0315-97
SY/T 0316-97
SY/T 0317-97
SY/T 0407-97
Technical standard for external coating of fusion-bonded epoxy powder for steel pipelines
Recommended practice for on-site inspection of new pipelines
Building code for Yanlan land area
Specification for surface pretreatment of steel materials before coating (replacing
SYJ4007-86)
Specification for manufacturing, installation and acceptance of special water jacket heating furnaces for oil fieldsSY/T 0419-97
6SY/T 0420-97
7SY 042297
SY/T 0442--97
SY/T 0448--97
10SY/T 0449-97
11SY/T 0450-97
12SY 0466-97
Technical Standard for Petroleum Asphalt Anticorrosion Layer of Buried Steel Pipeline (Replaces SY) 4020-88
SYJ 8-84)
Oilfield Gathering and Transportation Pipeline Construction and Acceptance Specification (Replaces SYJ 4022-88.SYI4009
86:SY 406193)
Technical standard for internal coating of steel pipeline fusion epoxy powder (replaces SYJ4042-89)
Construction and acceptance specification for steel pressure vessels for oil and gas processing in oil and gas fields (replaces SYI4048
Construction and acceptance specification for steel atmospheric pressure vessels for oil and gas fields (replaces SYJ4049-91)
Seismic design specification for buried steel pipelines for oil (gas) (replaces SYI4050-91)
Construction and acceptance specification for natural gas gathering and transportation pipelines (replaces SY 4066-93, SY / T
4082-95
13SY/T0515-1997 Oil and gas separator specification (replaces SYJ751589)
14SY/T5020-199? Tapered cylindrical thread for drilling pumps (replaces SY 502080. SY 5021-80)
15SY/T5212-1997 Quality classification of beam pumping units (replaces SY5212-87)
16SY/T 5332—1997E
Technical specification for onshore two-dimensional seismic exploration data processing (replaces SY5332-92)
SY/T 5455--1997
SY/T 5595-1997
19SY/T 5599-1997
SY/T 5675—1997
Technical specification for onshore three-dimensional seismic exploration data acquisition (replacing SY5455-92)bzxZ.net
Oilfield chains and sprockets (replacing SY/T5595-93)
Specification for the compilation of geological maps for oil and gas exploration well completion (replacing SY5599-93)
Specification for the compilation of geological summary reports for oil and gas exploration well completion (replacing SY/T5675—
21SY/T5788.2-1997 Specification for gas logging for oil and gas exploration wells (replacing SY/T 5788.2—93)
SY/T 6187-1997
23SY/T 6285-1997
SY/T 6286-1997
SY/T 6287-1997
SY/T 6288--1997
27SY/T6289-1997
SY/T 6290—1997
29SY/T 6291-1997
30SY/T 6292—1997
31SY/T 6293-1997
32SY/T 6294-1997
190 series diesel engines for oil drilling rigs
Use and scrapping conditions
Evaluation methods for oil and gas reservoirs
Detailed description methods for carbonate reservoirs
Determination methods for oil well production index
Selection methods for drill supports and drill chains
Technical specifications for exploration using continuous electromagnetic profiling
Auxiliary data formats for onshore three-dimensional geophysical exploration
Dynamic measurement technology of global satellite positioning system for petroleum geophysical exploration Specification
Exploration and oil testing data interpretation and quality
Specification for exploration and oil testing work
Field sampling specification for oil and gas exploration well analysis samples
Reliability prediction method for oil drilling and production equipment
33SY/T6295-1997
34SY/T7507-1997 Determination of water content in natural gas by electrolytic method (instead of SY7507-87)
Determination of total sulfur in liquefied petroleum gas in oil and gas fields
35SY/T 7508-1997
Determination of total sulfur in liquefied petroleum gas by oxidation microcoulometry (instead of
SY 7508-87
The above standards shall be implemented as of June 1, 1998. China National Petroleum Corporation
December 28, 1997
Before. This specification is based on the requirements of Document No. 52 of (96) Zhongyou Jijianzi, edited by Liaohe Petroleum Exploration Bureau Oilfield Construction Engineering Company No. 2, and revised in conjunction with China National Petroleum Corporation Engineering Technology Research Institute on the "Oilfield Gathering and Transportation Pipeline Construction and Acceptance Specification" SYJ4022-88. This specification is based on the "Oilfield Gathering and Transportation Pipeline Construction and Acceptance Specification" SYJ4022-88, and integrates the relevant provisions of the "Oilfield Well Site Process Installation Engineering Construction and Acceptance Specification (Oil Production Well Site)" SYJ4009-86, "Manifold Fabrication and Installation Engineering Construction and Acceptance Specification" SYJ4023-89, "Heavy Oil Thermal Recovery Pipeline Construction and Acceptance Specification" SY4061-93, and is revised with reference to the relevant national and petroleum industry standards. From the date of implementation, this standard will replace SYJ4022-88, SYI4009-86SY4061-93.
During the revision process, we widely solicited opinions from relevant units and experts through letter review and joint review, striving to achieve advanced technology, economic rationality, and quality assurance, taking into account both the current construction level and the future development direction. This specification was discussed and revised repeatedly, and finally the Petroleum Engineering Construction Professional Standardization Committee and relevant departments reviewed and finalized it.
The main contents of the revised specification are: general principles, measurement and layout, construction zone cleaning and pipe laying, steel pipe, pipe fittings and valve inspection, steel pipe and pipe fittings processing, pipeline installation, pipeline welding and inspection, pipeline anti-separation and insulation, pipe trench excavation, pipeline trenching and backfilling, pipeline pressure testing and cleaning, project completion acceptance, etc., authorized by China National Petroleum Corporation, this specification is interpreted by Liaohe Petroleum Exploration Bureau Oilfield Construction Engineering No. 2 Company.
In order to improve the quality of the specification, each unit should pay attention to summarizing experience and accumulating data in the process of implementing this specification, and send relevant opinions and suggestions to the Technical Department of the Second Oilfield Construction Engineering Company of Liaohe Petroleum Exploration Bureau (Xinglongtai, Panjin City, Liaoning Province: Postal Code 124012) at any time.
Editor: Second Oilfield Construction Engineering Company of Liaohe Petroleum Exploration Bureau. Participating units: China National Petroleum Corporation Engineering Technology Research Institute Main drafters: He Minbang Peng Zizheng: Xiao Xingcai Yang Suyun Xue Shilu 1 General provisions
China National Hydropower
2 Measurement and layout, construction zone cleaning and pipe layout
2.1 Measurement and layout
2.2 Construction zone cleaning:
China PE+E93
2.3 Transportation and pipe layout of anti-corrosion and thermal insulation pipes
3 Inspection of steel pipes, pipe fittings and valves
3.1 General requirements
3.2 Inspection of steel pipes
3.3 Inspection of general parts
3.4 Inspection of valves
China National Hydropower ... 4 6 0P4 Steel pipe and pipe fittings processing
4.1 Steel pipe cutting
4.2 Pipe fittings production
43 Compensator processing
4.4 Pipe support and hanger production
4.5 Jacket pipe production
4.6 Manifold production
5 Pipeline installation
5.1 Pipeline assembly
5.2 Pipe fittings assembly
53 Installation of fume extractor
5.4 Installation of branch and hanger
5.5 Manifold installation
5.6 Valve installation
6 Welding and inspection of pipelines
6.1 General requirements
6.2 Drying materials
6.3 Welding
6.4 Coal seam inspection 1
Zhongpinda
? Pipeline anti-corrosion and insulation
7.1 General requirements
7,2 Pipeline anti-corrosion and insulation and patching and joint filling
+** 24
8 Pipeline trench excavation, pipeline trenching and backfilling
8,1- General requirements*
8.2 Warning trench excavation
8.3 Ordinary trench trenching and backfilling
9 Pipeline pressure testing and cleaning
9.1 General requirements
9.2 Sectional leak test for pipelines"
9.1 Pipeline strength and tightness test
9,4 Pipeline cleaning**
10 Project completion acceptance
Standard wording and terminology
Honoen 4]
Appendix Specification for Construction and Acceptance of Oilfield Gathering and Transportation Pipelines Article Explanation 431 General Provisions
1.0.1 This specification is formulated to improve the quality of oilfield gathering and transportation pipeline projects, ensure the safe operation of pipelines, and reduce project costs.
1.0.2 This specification applies to the construction and acceptance of oilfield gathering and transportation pipeline projects. Its scope of application is as follows:
1 Medium pressure is not greater than 32MPa
2 Medium temperature is -20~350℃
1.0.3 This specification does not apply to the construction and acceptance of natural gas pipeline projects with a working pressure greater than 1.6MPa .
1.0.4 The oilfield gathering and transportation pipeline project shall include the following types of pipelines: 1. Process pipelines for oil production, water injection, and steam injection wells; 2. Pipelines for transporting crude oil, petroleum gas with a working pressure not exceeding 1.6MPa, water injection, power fluid, dilution oil, active water, oily wastewater and their mixtures between wellheads, metering stations, metering transfer stations (or oil transfer stations), and joint stations; 3. Oil pipelines between joint stations and oil depots and oil transportation stations in oilfields; 4. Installation of thermal production system pipelines such as steam injection pipelines, steam pipelines, and oil production heating pipelines, and their accessories.
1.0.5 Classification and grading of oilfield gathering and transportation pipelines The method shall comply with the provisions of Table 1.0.5.
1.0.6 The construction of oilfield gathering and transportation pipelines shall comply with the requirements of the design drawings. Modification of design or substitution of materials shall be subject to the consent of the design unit. 1.0.7 The construction and acceptance of crossing projects of oilfield gathering and transportation pipelines shall comply with the "Petroleum and Natural Gas Pipeline Crossing Project Construction and Acceptance Specification" SY/T4079, and the construction and acceptance of crossing projects shall comply with the "Petroleum and Natural Gas Pipeline Crossing Project Construction and Acceptance Specification" SY4070. Other engineering construction. In addition to complying with the provisions of this specification, it shall also comply with the provisions of the relevant national mandatory standards in force. Table 1.0.5 Oilfield gathering and transportation pipelines Pipeline category and grade classification method: Carbon pipe pressure range and ordinary low alloy steel pipe pressure range (MPa) Material classification: Pipeline category: Joint station to oil depot, first station pipeline: high temperature and high pressure steam injection pipeline in heating station to metering transfer station to joint station pipeline, heating station to wellhead steam injection pipe and port to metering transfer station operation pipeline. Well engineering
Technical pipelines, heat tracing pipes
2 Measurement and layout, construction zone cleaning and pipe layout
2.1 Measurement and layout
2.1.1 Before construction of the project, the design personnel should explain the design to the construction unit and hand over the columns on site
2.1.2 The construction unit should re-measure and layout according to the design data, and set up markers for control and review. For pipelines with different specifications of pipes and different anti-corrosion insulation levels, clear markings should be made at the demarcation points during construction and layout. 2.1.3 When a single pipe is installed, the width of the construction zone shall comply with the provisions of Table 2.1.3 Table 2.1.3 Width of construction zone for single pipe
Pipe diameter D% (mm)
≤ 200
20<≤ 400
DN> 400
Maximum width of construction zone (m)
2.1.4 When multiple pipelines are laid in the same trench, the width of the construction zone shall be increased by 5 times the diameter of the pipe for each additional pipeline on the basis of the width of the single pipe. 2.1.5 When the width of the construction zone needs to be increased or a construction access road needs to be built in special areas, it should be negotiated with the local government or the competent authority in advance
2.1.6 A pipeline storage yard should be set up at intervals along the construction zone. The pipeline storage area should avoid high-voltage lines, flood gullies, etc., and have certain fire prevention and flood prevention measures.
2.2 Cleaning of the construction area
2.2.1 Before pipeline construction, the structures, stacked objects, grass and trees within the construction area should be cleaned up. And leveled to ensure the driving of construction machinery and pipeline construction. 2.2.2 The safe distance between large construction machinery and overhead power lines should comply with the provisions of Table 2.2.2.
Table 2.2.2 The safe distance between large construction machinery and overhead power lines Rated voltage of transmission line (
≥ 60
Minimum safe distance (m)
2.2.3 Effective drainage measures should be taken in low-lying areas. 2.3 Transportation and pipe layout of anti-corrosion and thermal insulation pipes
2.3.1 When loading anti-corrosion and thermal insulation pipes: the specifications, materials and thermal insulation grades of the steel pipes should be checked. When hoisting anti-corrosion and thermal insulation pipes, the hoisting tools should not damage the anti-corrosion and thermal insulation layer. When using a hook to lift the pipe mouth, a special hoisting tool should be used and the pipe end should not be damaged. 2.3.2 When transporting anti-corrosion and thermal insulation pipes, the pipes should be placed on the ground. The space between the pipes and the parts in contact with the transport equipment should be padded with soft materials. When bundling the pipes, soft materials should be padded at the stress-bearing parts of the pipes, and the bundling should be firm.
2.3.3 The anti-corrosion and thermal insulation pipes should not be pulled too high or too wide, and the pipes should be unloaded at the designated location. The anti-corrosion and thermal insulation pipes transported to the construction site should be inspected and accepted by the pipeline installation unit, and the handover procedures should be completed with the transportation management unit. Pipes with severely damaged anti-corrosion layers should be transported back to the anti-corrosion prefabrication plant.
2.3.4 Steel pipes transported to the construction site shall not be directly piled on the ground with stones, slag, hard soil layer, etc. The height of the steel pipes shall be based on not compressing and damaging the anti-corrosion and insulation layer. 2.3.5 It is strictly forbidden to load, unload and move pipes by prying, rolling, sliding and other methods that damage the anti-corrosion layer.
2.3.6 Before laying the pipeline, the circumference of the pipe end should be measured, and the circumference of the two pipe ends that form the butt joint should be reasonably selected.
2.3.7 When laying buried pipelines, they should be laid on the side of the trench where there is no soil. The distance between the pipe and the ditch edge should not be less than 0.5m. The overhead pipeline layout should be determined according to the actual situation on site. 2.3.8 When multiple pipes are laid in parallel, the net spacing between each pipe should be 0.5~1.0mg according to the pipe diameter. 2.3.9 When laying pipes, adjacent pipe openings should be 100~200mm apart: to facilitate cleaning and handling of pipe openings. 2.3.10 In areas with large slopes, steel pipes should have stabilizing measures, but the anti-corrosion layer or insulation layer should not be damaged. 3 Inspection of steel pipes, pipe fittings and valves 3.1 General requirements 3.1.1 Steel pipes, pipe fittings and valves should be ordered according to the models, specifications and technical parameters specified in the design. If changes are required, the design unit must apply for a technical visa, and the construction unit or engineering supervision must complete the signing and approval procedures in a timely manner. 3.1.2 When steel pipes, pipe fittings, and valves arrive, they should be inspected and accepted according to the supply contract and the factory quality certificate, and should be marked and properly kept. Steel pipes, pipe fittings, and valves should be inspected for appearance before use, and their surfaces should meet the following requirements: no defects such as pores, cracks, slag inclusions, folds, heavy skin, and scarring. 2 Rust or pitting should not exceed the allowable negative deviation value of the wall thickness. 3 The material identification should be consistent with the quality certification document. When there is doubt about the quality of steel pipes, pipe fittings, and valves, they should be re-inspected according to the requirements of the current national standards (specifications), and can only be used after passing the inspection. 3.21 Inspection of steel pipes
3.2.1 The steel pipes used in the project must be accepted in accordance with the current national standards: acceptance should be carried out in batches, and each batch should consist of steel pipes of the same manufacturer, specification and steel grade. 3.2.2 High-pressure steel pipes should have paint color markings representing steel types and steel grades, specifications, standard numbers and manufacturer's stamps.
3.23 During the acceptance of steel pipes, if it is found that the quality certificate does not match the steel grade stamp or steel grade mark of the received steel pipe, or there is no steel grade on the label, re-inspection should be carried out. 3.2.4 Re-inspection, non-destructive testing and defect treatment of steel pipes should be carried out in accordance with the relevant provisions of "Industrial Pipeline Construction and Acceptance Code (Metal Pipeline)" GBJ235. 3.3 Inspection of pipe fittings
3.3.1 The materials and specifications of pipeline accessories such as flanges, tees, reducers, elbows, compensators and fasteners should comply with the design requirements. Before use, the manufacturer's quality certificate should be checked to confirm that it complies with the provisions of the current national standards. After acceptance, the acceptance record should be filled in.
3.32 The roughness and flatness of the flange sealing surface should comply with the provisions of the current national standards. There should be no radial grooves and burrs, and the threaded part should be complete and free of scars. 3.3.3 Pipe ends shall comply with the following provisions:
1 The minimum wall thickness of circular and shaped ends shall not be less than 90% of the nominal wall thickness; and shall not be less than the design thickness:
·2 The allowable deviation of the outer diameter or outer diameter ovality of elliptical and dished ends is ±2mm; the allowable deviation of the curved surface height is ±4mm; the allowable deviation of the straight edge height is gmm; the four convexities of the surface shall be checked with a sample of 300mm in length, and the gap shall not be greater than 2mm;
3 Flat cover ends should be used for pipelines with a design pressure of less than 10MPa. Their thickness and structure shall comply with the provisions of the "Design Regulations for Steel Petrochemical Pressure Vessels" issued by China Petrochemical Corporation.
3.3.4 The pipe diameter, roundness, wall thickness and end face limit deviations of elbows, reducers and compensators shall comply with the provisions of Table 3.3.4.
Table 33.4 Limit deviations of main dimensions of elbows, reducers and compensators (mm) Item
25≤DG
125≤D≤200
Tube 250≤430
250≤400
Outer diameter
Surface thickness
Wall deviation
Adjustment difference
Not greater than nominal wall thickness
Maximum surface thickness
Outer diameter: Outer diameter
|tt||Deviation four car (degrees)
Wall thickness deviation
Huai is greater than the public
Sea wall thickness
pzsompa
p10MPal
Not less than the design
Huai is greater than the public
Machine bend: 4/L
Zhen wall mold
25%, and!
25/Not
Not greater than the
Pipe fall, straight
Pipe 125≤ 0
The diameter of the crystal is greater than 3
Not less than the designed thickness
Continued Table 33.4
Huai Daping Gong
The wall thickness
Note: The maximum compensator roundness, thickness deviation, surface difference and ideal design requirements are the same. 3.3.5 The mechanical properties of high-pressure bolts and nuts should be inspected and accepted in accordance with the relevant provisions of GBI235.
3.4 Valve inspection
3.4.1 Check the valve before installation All valves should be inspected for appearance, and there should be no defects such as cracks and sand holes. The valve stem and flange sealing surface should be flat and smooth. The valve stem thread should be free of burrs or marks. If there is packing, the packing should be inspected. The tightened gland bolts should have sufficient adjustment margin. After passing the test, the strength test and tightness test should be carried out one by one. The strength test of welded valves can be carried out during the system test. The valve test should be carried out in accordance with the provisions of the "Inspection and Installation Specifications for Valve Valves" SY/T4102. When the working medium is water or steam: the pressure test medium is water: when When the working medium is oil and gas, kerosene is the preferred medium for the pressure test. 3.4.2 For valves that have passed the test, the internal accumulated liquid should be drained immediately. The sealing surface should be cleaned of anti-rust oil (except for valves that need to be degreased): Close the valve and cover the sealing cover, fill in the valve test record, and mark the valve. Store according to model and specification, and prevent rain, mud and other dirt from entering the valve body.
3.4.3 Before installing the valve, the transmission device operating mechanism should be cleaned and inspected, and the rotation should be flexible and reliable without sticking. . 3.4.4 For the door with steam jacket, the jacket part shall be subjected to strength test at 1.5 times the working pressure or according to the product manual. 3.4.5 Before installation, the safety valve shall be sent to the professional department approved by the safety department for pressure setting according to the design pressure and sealed with lead. When returning the calibrated safety valve, the corresponding calibration certificate shall be requested.
4 Processing of steel pipes and pipe fittings
4.1 Cutting of steel pipes
4.1.1 Mechanical cutting is recommended for steel pipes. When mechanical cutting is used, such as toothless saws and grinding wheels, which may cause the cut to overheat, the cut surface should not be hardened: if cutting is done with oxyacetylene flame, the oxide layer should be removed. The surface quality of the cut shall meet the following requirements: 1 The cut surface shall be flat, without cracks, heavy skin, four convexities, shrinkage, slag, burrs, iron oxide, etc.;
2 The end face of the pipe mouth shall not be more than 1% of the pipe diameter, and shall not be more than 2mm4.1.2 The steel pipe shall be marked after cutting
4.1.3 Steel pipes with a wall thickness greater than or equal to 3mm shall be in accordance with the provisions of Table 4.1.3 Table 4.1.3 Groove type and assembly requirements
Name of the cut
1 Type of mouth
Type of groove
Groove and assembly type
Thickness (mm)|Groove size and assembly requirements
#=70° ± 55,
Upward welding 1mm2.5mm.
1mms 2mm
Downward welding: 1mm 2mm
1msps15mm
w=60°±5%,
upward welding:1mmxr≤ 3mm
Imms p& 2mm;
Downward welding: 1mmk2mm
1mmsps1.5mm
Bezel multi-floor
Tee interface
(branch pipe city
three sea interface
(main pipe slope
Continued Table 4.1.3
Groove and red-mounted type
Sakaguchi anti-inch and assembly requirements
Thickness [mm)
Homeps1.5mm
Imns and 3mm
K wind 1.5mm.
Processing groove. The groove processing should be machined. If the groove is cut by oxygen-acetylene flame, the oxide layer on the surface of the groove should be removed. 4.1.4 When assembling pipes and fittings of different wall thicknesses, if the outer wall alignment is required, the inner wall shall be thinned, and the thinning length shall be not less than 3 times the wall thickness difference; if the inner wall alignment is required, when the thin wall thickness is not more than 10mm and the thickness difference is more than 3mm, or when the thin wall thickness is more than 10mm and the thickness difference is more than 30% of the thin wall thickness or more than 5mm, the outer wall shall be thinned, and the thinning length shall be greater than or equal to 3 times the wall thickness difference (Figure 4.1.4), that is, L> 3 (6,-01).
Figure 4.1.4 Processing type of transition groove of unequal wall thickness (a) Outer wall alignment groove type: (b) Inner wall alignment groove type 4.2 Pipe fittings manufacturing
In 4.2.1, the bending of low-pressure pipes can be cold-bent or hot-bent, and the bending of high-pressure pipes should be cold-bent. The minimum bending radius of bent pipes shall comply with the provisions of Table 4.2.1 Table 4.2.1 Minimum bending radius of bent pipes
Pipeline type
Pressure pipeline
High-pressure pipeline
Note: Dw is the outer diameter,
pe1eMPa
Transmission method
Hot bending
Ling bending, hot
4.2.2 The production of on-site bent pipes shall comply with the following provisions: Minimum bending radius of bent pipes
1 The sand used for hot bending should be baked and sieved: It should be loaded into the pipe in batches and vibrated while loading: After vibrating, use a plugging plate with vent holes to seal both ends of the pipe; 2 Cold bending of bent pipes should be completed on a cold bending machine:
3 The straight side length at both ends of the bent pipe should not be less than 1.3 times the outer diameter of the pipe 4 The inspection of pipe fittings shall comply with the provisions of Section 3.3 of this code. 4.2.3 When making reducers, the allowable deviation of the center line of both ends from the specified value should not be greater than 1% of the outer diameter of the large end, and should not be greater than 5mm. The length deviation of the reducer should not be greater than 2.5mm
4.2.4 Elbows and reducers made of steel plate rolling and welding should not be used on pipelines with a design pressure greater than or equal to 1.6MPa, and their welds should be fully penetrated. The product certificate should have a weld non-destructive testing report, otherwise 10% of the total number of elbows or reducers in this batch should be re-tested by radiography. Its qualified level should be the same as that of the pipeline. 4.3 Compensator processing
4.3.1 The ellipticity, wall thickness reduction rate and axial deviation of the compensator elbow should comply with the provisions of the explosive elbow in Table 3.3.4. 4.3.2 The allowable deviation of the length of the cantilever wall of the compensator should be ±10mml. The plane distortion deviation should not be greater than 3mm per meter, and the total length should not be greater than 10mm. 4.4 Pipeline supports and hangers production
4.4.1 The shape of pipeline supports and hangers. The material, processing size, precision and welding shall comply with the design requirements.
4.4.2 The working surface of the support base and the support and hanger spring box shall be flat. 4.4.3 The welds of pipeline supports and hangers shall be inspected visually and shall not have defects such as leaking welding, pits, cracks, etc. Welding deformation shall be corrected. 4.4.4 Qualified supports and hangers shall be treated with rust prevention and numbered and stacked separately.
4.5 Jacketed pipe production
4.5.1 The high-pressure main pipe in the casing shall not have welds, and the medium and low-pressure main pipes in the casing shall not have welds. If there are welds, pressure testing and non-destructive testing shall be carried out according to design requirements. 4.5.2 The spacing between the outer casing and the main pipe and the setting of the straightening block shall be constructed according to design requirements.
4.5.3 After the main pipe is processed, the bare pipe should be tested for strength and tightness: the test requirements should be the same as those of the main line.
4.5.4 After the jacket pipe is manufactured, the jacket space should be tested for strength according to the design requirements.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.