SYJ 4006-1990 Specification for construction and acceptance of long-distance pipeline cathodic protection projects
Some standard content:
Standard of the People's Republic of China for the construction and acceptance of long-distance pipeline cathodic protection engineering SYJ 4006-90 1991 Beijing Tianhe San Petroleum Corporation of China Published by Shijiang Industry Press (Building 1, No. 19, Anhua District, Beijing) Petroleum Industry Press Printing Factory Non-printed Xinhua Bookstore Beijing Publishing House 850×1168 mm 2-page 5/B printing sheet 12,000 words Printing 1-7.000 May 1992 Beijing First Printing Quality [May 1992 Beijing First Printing ISBN: 155021·3405 Price: 0.39 yuan Copyright Exclusive Notice on the approval and release of 14 petroleum industry standards including "Design Specifications for Electric Dehydration of Crude Oil"
To all relevant units:
The Ministry of Energy has approved 10 petroleum engineering construction standards including "Design Specifications for Electric Dehydration of Crude Oil" as petroleum industry standards, which are now released. Their numbers and names are as follows: Serial No.
SYJ45-91
SYJ 46-91
SYJ 47-9
4 SYJ 4001-90
SYJ 4002-90
SYJ 4003-90
7SYI 4004-90
SYJ 40060
Design specification for electric dehydration of crude oil
Design specification for vacuum deoxidation of water injection in Fantian
Design, installation, operation and maintenance of internal cathodic protection system of crude oil processing container
Construction and acceptance of long-distance pipeline line engineering
Specification (replaces SYI4001-84)
Construction and acceptance specification for process pipeline engineering in long-distance pipeline station (replaces SYJ4002--84)
Construction and acceptance of long-distance pipeline pump group
Specification (replaces SYJ4 003-84)
Tube heat furnace construction and acceptance specifications (replacing SYJ4004-84)
Long-distance pipeline shade protection construction and acceptance specifications (replacing SYJ4006-84)
9SYJ40.46--90Seismic appraisal and reinforcement specifications for buildings and structures of petroleum enterprises in six-degree areas
Buried steel pipeline epoxy coal asphalt anti-corrosion coating JOSYJ4047-90
Construction and acceptance specifications
11 SYI 4048-90
12SYI 4049-91
13SYJ 4050-91
14SYJ 4051-91
Specifications for construction and acceptance of steel pressure vessels for oil and gas
Construction and acceptance specifications for steel atmospheric pressure vessels for oil fields
Acceptance specifications
Seismic resistance
Design specifications for buried oil (gas) pipelines
Hot-fire
Safety technical regulations for daily oil and gas gathering and transportation process pipelines
The above standards shall come into force on December 1, 1991. Appendix: Fourteen Standards Approval Materials, Ministry of Energy of the People's Republic of China
July 19, 1991
Revision Notes
This specification replaces the "Second-stage Construction and Acceptance Specification for Cathodic Protection of Long-distance Pipelines": (SYJ4006-84). The China National Petroleum Corporation Pipeline Bureau, together with the China National Petroleum Corporation Engineering Technology Research Institute, revised the "Construction and Acceptance Specification for Cathodic Protection of Long-distance Pipelines" (SYI4006-84) in accordance with the spirit of the former Ministry of Petroleum Industry (88) Youkezi No. 92. During the revision process, we widely solicited opinions from relevant units through both letter review and joint review, striving to achieve advanced technology, reasonable economy, In order to ensure safety and quality, all the provisions in the original specifications that are currently applicable will be retained; all the contents that are outdated or have major limitations will be deleted; all the inaccurate data or unclear regulations will be modified; new technologies or scientific research results that have been identified and promoted by the state will be supplemented. Finally, the Capital Construction Engineering Bureau of China National Petroleum Corporation will review and finalize them together with relevant departments. The revised specifications are divided into 3 chapters, and the main contents are: General Provisions; Anti-corrosion insulation requirements for cathodic protection pipelines and installation of insulating flanges; Acceptance and installation of power equipment, installation of junctions and auxiliary anodes; Installation of test piles; Production, installation and burial of inspection pieces; Installation and commissioning of sacrificial anodes; Handover acceptance and materials, etc. During the implementation process, it is hoped that all units will carefully summarize their experience in light of the actual project and pay attention to accumulating data. If any modification or supplement is found, please send your opinions and relevant information to the Engineering Office of China National Petroleum Corporation Pipeline Bureau in Langfang, Hebei Province and the Standards Office of China National Petroleum Corporation Engineering Technology Research Institute, No. 40, Jingjin Road, Tanggu District, Tianjin. China National Petroleum Corporation Pipeline Bureau
[August 1990
Chapter 1 General Provisions
Chapter 2 Requirements and Insulation Requirements for Cathodic Protection of Pipelines Installation of flange
Chapter 3 Acceptance and installation of power supply equipment
Chapter 4 Installation of confluence point and auxiliary anodesChapter 5 Installation of test piles
Chapter 6 Preparation and installation of inspection piecesChapter 7 Installation of sacrificial anodes
Chapter 8 Commissioning
Chapter 9 Handover acceptance and numerical engineering data
Appendix 1 Specification wording explanation
Chapter 1 General provisions
Article 1.0.1 In order to ensure the quality of cathodic protection engineering construction of long-distance pipelines, this specification is specially formulated.
Article 1.0.2 This specification applies to the construction and acceptance of cathodic protection engineering of buried steel trunk pipelines and regional steel pipe networks and containers in stations for transporting crude oil, finished products and natural gas.
Article L.0.3 The construction of cathodic protection engineering should be carried out simultaneously with the main pipeline, and should be put into operation within half a year after the trunk line is laid.
Article 1.0.4 Any part not covered by this specification shall be implemented in accordance with the provisions of the current relevant standards and specifications; if this specification conflicts with the relevant national specifications or standards during implementation, it shall be implemented in accordance with the provisions of the national standards and specifications. Chapter II, Anticorrosion Insulation Requirements for Cathodic Protection Pipelines and Installation of Insulating Flanges
Article 2.0.1 The oil and gas ducts and their installations that are protected by cathodic protection must be well insulated. The quality of the anticorrosion layer shall comply with the provisions of the current relevant standards. Article 2.0.2 The appearance of the anti-drip layer must be inspected before the pipeline is laid in the trench: and a high-voltage electric spark leak detector shall be used for point detection. After backfilling, an audio signal leak detector is required to detect leaks; it is required that no more than five leaks shall be detected in a continuous 10km inspection. Before the delivery of the project, 5% of the total length of the pipeline shall be randomly inspected, and double inspection shall be conducted if it fails; for the delivery, 15% of the total length of the pipeline shall be continuously inspected by Party A, Party B, and Party C, and rework shall be carried out if it fails.
Article 2.0.3 When steel casing is used for oil and gas pipelines: Insulation support shall be provided between casings according to design requirements for electrical insulation, and insulation shall be checked with 500V megohmmeter. Both ends of casing shall be sealed with firm non-conductive materials. Article 2.0.4 Insulation flange shall be assembled first, then short pipe shall be welded for water pressure test and electrical inspection, and then welded to the pipeline as a whole after passing the test. Water pressure test shall be carried out in accordance with the relevant provisions of the current "Construction and Acceptance Specifications for Process Pipeline Engineering in Long-distance Pipeline Stations" (SYJ4002). Before assembling and welding the insulation flange, the insulation degree shall be measured with a 500V megohmmeter. The insulation resistance value shall be greater than or equal to 2M9 for qualified. Those who fail to meet the requirements shall replace the insulation gasket, washer and casing. Chapter 3 Acceptance and Installation of Power Supply Equipment
Article 3.01 The power supply equipment and electric material device selected for rigid pole protection project shall comply with the provisions of the current relevant standards and specifications, and the electrical equipment shall have a nameplate and factory certificate at the bottom.
Article 3.0.2 When the power supply equipment with cathodic protection arrives at the construction site, the main equipment and accessories shall be checked and counted according to the packing list. The main equipment and accessories shall be complete. The technical documents, drawings and equipment manuals of the power supply equipment shall be complete. Article 3.0.3 The electric elastic equipment with cathodic protection shall be stored in a place with a temperature of 5~40℃ and a relative humidity of less than %, clean, windproof, and able to avoid rain, snow, flying sand, and dust. It shall not be stored in a place where the surrounding air contains harmful media. Article 3.0.4 When transporting electrical equipment, damage to various components and the paint layer shall be prevented.
Article 3.0.Article 5 The safety meter of the cathodic protection power supply equipment shall be in accordance with the design and equipment product manual requirements. And meet the following requirements: There should be no equipment that hinders ventilation and affects sensitive heat near the power supply equipment. 2. The power supply equipment should be placed carefully during installation. It should not be subjected to vibration. 3. The power supply voltage should match the rated voltage value of the equipment during wiring. The wiring resistance should be checked according to the wiring diagram to check the relationship between AC and DC voltages: The output power supply characteristics should be correct, and +", "-\" symbols should be marked on the wiring terminals. 5. After installation, the dust on the power supply equipment should be cleaned up. Article 3.0.6 Before installing the thyristor constant potential, the following performance indicators should be tested one by one according to the technical standards: input characteristics, drift characteristics, load characteristics, interference resistance, current flowing through the reference electrode, anti-shock residual wave performance, over-current short-circuit protection and feedback, automatic alarm and other performance indicators. If they are not met, they should not be accepted. The acceptance test wiring is shown in Figure 3.0.6. Article 3.07 The power supply equipment must be inspected before being sent back: all certificates should be complete, the connection should be good, the connection should be correct, the vertical circuit screw connections should be solid: the equipment grounding should be reliable. During installation, the "zero positive line" must be connected to the pipeline with a separate frame relay. Article 3.0.8 In addition to meeting the requirements of the equipment, the grounding of the power supply device should also comply with the relevant provisions of the current "Technical Regulations for Grounding Design of Power Equipment" (SDJ8) and "Technical Regulations for Overvoltage Protection Design of Power Equipment" (SDI7). Article 3.0.9 The burial depth of the copper-saturated copper sulfate reference electrode used in the constant potential instrument, the preparation of the saturated copper vegetable acid solution and the concentration of the copper sulfate used should all meet the design requirements.
Constant power supply
Parameter test
Position parameter
Digital power supply
P-8P2-type
Figure 3.0.6 Thyristor constant potential acceptance test wiring diagram 4
Chapter 4 Installation of busbar and auxiliary anode Article 4.0.1 Busbar and auxiliary anode must be strictly connected and fixed in accordance with the design requirements, and no loose connection or desoldering is allowed. After connection, anti-corrosion insulation treatment must be carried out with anti-corrosion materials compatible with the pipeline anti-corrosion layer.
Article 4.0.2 The installation of steel auxiliary anode devices shall comply with the following provisions: 1. The location, layout and quantity of the auxiliary anode shall meet the design requirements: 2. The auxiliary anode should be reasonably located in an area with low soil resistivity, but in special cases, chemical reagents or salt can be added for treatment. The grounding resistance of the auxiliary anode after burial should not be greater than 102;
3. The surface of the auxiliary anode should be cleaned and it is strictly forbidden to paint, tar and asphalt;||4. The buried end of the auxiliary anode should not be less than 1.0m1 from the ground;
5. The welding of the auxiliary anode device must comply with the relevant welding regulations in the current "Construction and Acceptance Specifications for Process Pipeline Engineering in Long-distance Pipeline Stations" (SYI4002): Article 4.0.3 The installation of high-silicon cast iron and graphite auxiliary anode devices shall comply with the following regulations:
, the location, anode layout and quantity of the high-silicon cast iron and graphite auxiliary anode bed shall comply with the full design regulations.
, the high-silicon cast iron and graphite auxiliary anode connection cable (lead The cable) and the power cable are connected by welding. Welding is reliable: All welding places should be sealed with non-oxidizing grease and insulated. The structure is "three-finger cloth". After being solidified, it should be checked with a high-rejection spark leak detector (using 2.4kV voltage). There should be no pinholes. 3. The cable layout should comply with the requirements of D164 of the Cable Installation Atlas 4. A certain margin should be left for the cable length to adapt to the sinking of the backfill soil 5. The anode must be filled with coke slag: its diameter should be 15mm, the coke thickness of the upper and lower parts of the anode should not be less than 200mm, the thickness of the surrounding coke slag should not be less than 100mm, the coke particles and the surrounding backfill should be in good condition, and should be rammed-5 -
Solid. No human or animal matter should be mixed in the coke.
Sixth, the original part of the coke backfill must be filled with special stones or coarse sand with a particle size of about 5~10mm, with a thickness of 50mm, and the surface backfill soil seat is 201mm higher than the original natural ground
Seventh, the positive overhead wire or cable lead between the bus cable and the lead protection should be fastened with bolts, and the wire end should be equipped with an adjustable terminal. The wiring should be carried out on the cement pole of the overhead line or in the junction box of the cement pile of the cable lead. 8. Before burying the sun-catching shuttle, it must be inspected according to product performance indicators, the joints must be sealed, and the surface must be checked for gaps. Unqualified ones shall not be used for construction. Chapter 5 Installation of test piles
Article 5.0.1 The installation of test piles and their leads shall comply with the following regulations: 1. The test piles must be constructed according to design requirements. 2. As leads for corrosion control or corrosion testing, attention should be paid to their installation status, and welding leads on the pipe section with concentrated stress on the pipeline should be avoided. 3. When welding the leads to the pipeline, the pipe should be The local waterproof layer of the section must be cleaned and the coal joint must be firm. After welding, the joint must be treated with anti-corrosion insulation again with materials compatible with the original waterproof film layer.
Fourth, the connection of the lead should be carried out after the pipeline is laid in the trench and before the earthwork is backfilled. Five, after the test pile lead is welded, soft soil should be backfilled, and the lead should be prevented from being broken or damaged.
Sixth, the connector should not leak, and the exposed test lead, pipe body and pipe fittings should be added with an edge protection layer: its insulation material should be consistent with the original wire insulation layer and pipe body. The same coating Article 5.0.2 The pipeline confluence connection cable, equalizing cable and pipeline current test cable should be connected in the test pile junction box Article 5.0.3 The test pile should be no less than 0.4m above the ground, the number of test piles should be determined, and the number, marking and buried position should comply with the "Buried Steel Pipeline Forced Current Protection Design Specification" (SYJ36-89) Article 5.0.4 The test pile position should avoid the average, and the old buried relative position should not exceed the design spacing of 10m. The actual position should be truly reflected in the completion data Chapter 6 Inspection piece production and installation and burial Article 6.0.1 The material of the inspection piece must be the same as the material of the protected body. The inspection piece production size, weight and processing should comply with the "Buried Steel Inspection Piece Magic Corrosion Rate Test Method" (SYJ29-87) Article 6.0.2 The number and buried position of the inspection piece should comply with the design requirements. If no regulations are made, each group of inspection pieces should be 12 pieces, of which six pieces are connected to the protected body, and the other six pieces are in a natural erosion state. Article 6.0.3 Inspection pieces should be buried according to design requirements under the supervision of the management unit. The processing and processing documents of inspection pieces should be submitted to the superior department for management. Article 6.0.4 The buried depth of the inspection piece should be the same as the bottom of the pipeline, and it should be 0.3m away from the outer wall of the pipeline. Its connection and anti-corrosion insulation requirements are the same as those of the test wire. 8 -
Chapter 7 Installation of sacrificial anodes
Article 7.0.1 The type, quantity, distribution and connection method of alcoholic anodes should meet the design requirements.
Article 7.0.2 When the sacrificial anode connection cable and the anode steel core are connected by welding, the cable insulation sheath should retain at least 501mml and the core should be tied with nylon rope or other ropes to prevent the cable from breaking during transportation. The welding place and the anode surface must be polished and cleaned with alcohol: after cleaning, epoxy resin or paint with the same effect and glass cloth should be used for corrosion protection and insulation, and the thickness should not be less than 3mm. There should not be any exposed metal. Sacrificial anode joints are shown in Figure 7.0.2.
The most resin and sparsely filled with high-cell sugar layer
Anode connection cable
Environmental tree
Cable and Xie Xinshi connection
Anode slow god
Environmental suppression layer
Medical 7.0.2 Schematic diagram of the sacrificial anode joint
Article 7.0.3 The sacrificial anode with welding wire should be polished before wrapping, and its surface must be cleaned before burying: There should be no oxide film and other dirt on the surface.
Article 7.0.4 The chemical filling material of the plug-in anode shall meet the following requirements. Unless otherwise specified, the plug-in anode in the soil must be wrapped with chemical packing materials. The preparation of the filling material shall be in accordance with the relevant provisions of the "Technical Standard for the Application of Magnesium Alloy Sacrificial Anodes (Trial)" (SYI19-86) and the "Technical Standard for the Application of Magnesium Alloy Sacrificial Anodes (SYI20--86)".
2. The weighing and mixed packaging of the filling material should be carried out indoors and must meet the following requirements:
1. The filling material should be packaged with dry adjustment and vibration: to ensure that the old plate is in the middle of the filling material:
2. The filling material packaging bag shall not be made of artificial fiber fabrics: 3. The wrapped anode must be strong so that it will not move during transportation
4. The bentonite part of the filling material shall not be replaced by clay: 3. The filling material in the anode hole should be filled on site. However, the anode must be located in the middle of the filling material. Mud and other debris must not be mixed into the filling material. The filling material must be compacted with the surrounding soil.
Article 7.0.5 The anode can be constructed by drilling or large excavation. It can be buried vertically or horizontally. Vertical is usually preferred. Article 7.0.Article 6 The buried depth, position and spacing of sacrificial anodes shall meet the design requirements. When there is no design requirement, the buried depth of sacrificial anodes shall be below the freezing line and shall not be less than 1.0m. The buried position shall be 3~5m away from the outer wall of the pipe and the buried spacing shall be 2~3m. Article 7.0.7 The connection between the pipeline and the cable must be welded firmly. And it shall comply with the relevant provisions of Article 5.0.1 of this standard.
Article 7.0.8 The laying of cables shall comply with the requirements of D164 of the Cable Design Atlas: The cables shall be marked and a certain margin shall be left when laying to adapt to the settlement of the fill.
Article 7.0.9 If the loop current of the sacrificial anode connection cable needs to be adjusted, an adjusting resistor can be connected in series between the pipeline and the sacrificial anode terminal. Article 7.0.10 The actual position of the cathode installed according to the construction procedure shall be reflected in the completion data, and each process must be signed by the construction order: and finally approved by Party A.
Chapter 8 Debugging
Article 8.0.1 After the construction of the forced current and polarized anode cathodic protection devices, the debugging work should be done. When debugging the forced current cathode protection, the given voltage of the power supply equipment should be continuously adjustable from small to large.
Article 8.0.2 When using forced current cathodic protection, the cathodic protection position of the pipeline should comply with the relevant provisions of the "Design Specifications for Forced Current Cathodic Protection of Buried Hazardous Pipelines" (SYJ3689).
Article 8.03 The debugging protection potential shall be based on the protection potential after polarization stabilization. The polarization time should not be less than three days. Article 8.0.4 When the reverse potential method is used for protection and debugging, the main machine should be put into operation first (negative electrode connected to the pipeline, positive electrode connected to the anode), and then the auxiliary machine (positive electrode connected to the pipeline, negative electrode connected to the anode); when stopping operation, the auxiliary machine must be turned off first and then the main machine. Request:
Chapter 9 Handover and Acceptance and Completion Data
Article 9.0.1 The cathodic protection device must meet the following requirements during the acceptance of the completion of the project: 1. The project to be accepted must meet the design requirements; 2. The technical documents required are complete and complete; 3. The appearance inspection shall be carried out in accordance with the provisions of this specification, and the project quality shall meet the requirements of this specification; 4. Test and inspection shall be carried out in accordance with the provisions of this specification: and records shall be made. Article 9.0.2 The following technical documents shall be submitted for the completed cathodic protection device during the handover and acceptance: ||t t||1. Actual construction drawings;
2. Documents proving design changes:
3. Instructions provided by the manufacturer, test records, product certificates, installation drawings and other technical documents:
4. Installation technical records:
5. Commissioning test records, protection potential parameters; 6. Hidden project records (cable design, confluence point, anode device, inspection film, etc.)
Article 9.0.3 The design provided by the designer shall be handed over to Party A together with the table at the time of completion acceptance. After the completion of the project, each construction unit must provide the above technical data as the basis for handover, and summarize and establish technical files to be submitted to the superior competent department, production management department and construction enterprises for self-preservation as the original data necessary for guiding normal cathodic protection.
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Appendix 1 Explanation of terms used in the specification
(I) When implementing the provisions of this specification, the terms used to describe the degree of strictness are as follows, so as to distinguish them in implementation. 1. 1. To express that it is very strict and it is necessary to do something, the positive word is "must"; the negative word is "strictly prohibited"; 2. To express that it is strict and should be done in normal circumstances, the positive word is "should not"; the negative word is "must not" or "may not"; 3. To express that there is a slight choice and it should be done first when conditions permit, the positive word is "should" or "may"; the negative word is "should not".
(II) The wording for clauses that specify that the decision should be made in accordance with the provisions of other relevant standards or specifications is “shall be implemented in accordance with…” or “shall meet the requirements (or “regulations”); the wording for clauses that do not necessarily have to be implemented in accordance with the specified standards or specifications is “may be implemented as a reference”-13
List of the editorial unit, participating units and main drafters of this specification Editorial unit: Engineering Department of Pipeline Bureau of China National Petroleum Corporation Participating unit: Engineering Technology Research Institute of China National Petroleum Corporation Main drafters: Zheng Shuguang, An Chunfu, He Wei-14
People's Republic of China Liuwu
Petroleum and Natural Gas Industry Standards
Long-distance Pipeline Sheath Protection Project
Construction and Acceptance Model
SYJ 4006—90
Article description
Petroleum Industry Law Liquid Society Oil Edition
(Building No. 1, Anhuali District 2, Andingmenwai, Beijing) Beijing Yanyi Jiahua Printing Factory Plate clerk
Published by Xinhua Bookstore Beijing Distribution Office
850X168 mm 32-page 3/8 printing sheet 8,000 words Printing 13,01 April 1993 Beijing 1st edition April 193 Beijing 1st printing Book number: 155021·3669 Price: 0.59 yuan Copyright reserved and no reproduction is allowed
Petroleum and natural gas industry standard of the People's Republic of China Long-distance pipeline cathodic protection project
Construction and acceptance specification
SYJ 4006—90
Article description
1991·BeijingThe three design towels provide the equipment, which will be handed over to Party A together with the completion acceptance. After the completion of the project, each construction unit must provide the above technical data as the basis for handover, and compile and establish a technical file to be handed over to the superior competent department, production management department and construction enterprise for self-preservation as the original data necessary for normal cathodic protection and construction technical files.
- 12—
Appendix 1 Specification Wording Explanation
(I) When implementing the provisions of this specification, the wording of the strictness required is explained as follows, so as to distinguish between them in implementation. 1. The words that are very strict and must be done are positive words such as "must";
The negative words are "strictly prohibited"
2. The words that are strict and should be done under normal circumstances are positive words such as "";
The negative words are "should not or must not"
3. Indicates that there is a slight choice and that the first thing to do when conditions permit is to use words such as "should\ or "may" for positive words and "should not" for negative words.
(II) The wording used in the article to specify that the decision should be made in accordance with the provisions of other relevant standards or specifications is "should be implemented in accordance with..." or "should meet the requirements (or "provisions")", and the wording used for not necessarily implementing the specified standards or specifications is "may be implemented as a reference"-13
List of the editorial unit, participating units and main drafters of this specification Editor: Engineering Department of Pipeline Bureau of China National Petroleum and Natural Gas Corporation Participating units: Engineering Technology Research Institute of China National Petroleum and Natural Gas Corporation Main drafters: Zheng Shuguang, An Chunfu, He Wei-14
People's Republic of China Liuwu
Petroleum and Natural Gas Industry Standards
Long-distance Pipeline Sheath Protection Project
Construction and Acceptance Model
SYJ 4006—90
Article description
Petroleum Industry Law Liquid Society Oil Edition
(Building No. 1, Anhuali District 2, Andingmenwai, Beijing) Beijing Yanyi Jiahua Printing Factory Plate clerk
Published by Xinhua Bookstore Beijing Distribution Office
850X168 mm 32-page 3/8 printing sheet 8,000 words Printing 13,01 April 1993 Beijing 1st edition April 193 Beijing 1st printing Book number: 155021·3669 Price: 0.59 yuan Copyright reserved and no reproduction is allowed
Petroleum and natural gas industry standard of the People's Republic of China Long-distance pipeline cathodic protection project
Construction and acceptance specification
SYJ 4006—90
Article description
1991·BeijingThe three design towels provide the equipment, which will be handed over to Party A together with the completion acceptance. After the completion of the project, each construction unit must provide the above technical data as the basis for handover, and compile and establish a technical file to be handed over to the superior competent department, production management department and construction enterprise for self-preservation as the original data necessary for normal cathodic protection and construction technical files. bZxz.net
- 12—
Appendix 1 Specification Wording Explanation
(I) When implementing the provisions of this specification, the wording of the strictness required is explained as follows, so as to distinguish between them in implementation. 1. The words that are very strict and must be done are positive words such as "must";
The negative words are "strictly prohibited"
2. The words that are strict and should be done under normal circumstances are positive words such as "";
The negative words are "should not or must not"
3. Indicates that there is a slight choice and that the first thing to do when conditions permit is to use words such as "should\ or "may" for positive words and "should not" for negative words.
(II) The wording used in the article to specify that the decision should be made in accordance with the provisions of other relevant standards or specifications is "should be implemented in accordance with..." or "should meet the requirements (or "provisions")", and the wording used for not necessarily implementing the specified standards or specifications is "may be implemented as a reference"-13
List of the editorial unit, participating units and main drafters of this specification Editor: Engineering Department of Pipeline Bureau of China National Petroleum and Natural Gas Corporation Participating units: Engineering Technology Research Institute of China National Petroleum and Natural Gas Corporation Main drafters: Zheng Shuguang, An Chunfu, He Wei-14
People's Republic of China Liuwu
Petroleum and Natural Gas Industry Standards
Long-distance Pipeline Sheath Protection Project
Construction and Acceptance Model
SYJ 4006—90
Article description
Petroleum Industry Law Liquid Society Oil Edition
(Building No. 1, Anhuali District 2, Andingmenwai, Beijing) Beijing Yanyi Jiahua Printing Factory Plate clerk
Published by Xinhua Bookstore Beijing Distribution Office
850X168 mm 32-page 3/8 printing sheet 8,000 words Printing 13,01 April 1993 Beijing 1st edition April 193 Beijing 1st printing Book number: 155021·3669 Price: 0.59 yuan Copyright reserved and no reproduction is allowed
Petroleum and natural gas industry standard of the People's Republic of China Long-distance pipeline cathodic protection project
Construction and acceptance specification
SYJ 4006—90
Article description
1991·Beijing
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