GB 50251-2015 (GB 50251-2003) PDF English
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GB 50251-2003: Code for design of gas transmission pipeline engineering---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50251-2003
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Code for Design of Gas Transmission Pipeline
Engineering
Issued on: JUNE 10, 2003
Implemented on: OCTOBER 1, 2003
Jointly Issued by Ministry of Construction of the People's Republic of China
General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Code for Design of Gas Transmission Pipeline Engineering
Chief Development Department. Subcommittee on Design of National Technical Committee on Petroleum
Engineering Construction of Standardization Administration of China
Approval Department. Ministry of Construction of the People's Republic of China
Implemented on: OCTOBER 1, 2003
Beijing 2003
NOTICE
This code is written in Chinese and English. The Chinese text shall be taken as the ruling one in
the event of any inconsistency between the Chinese text and the English text.
Announcement of the Ministry of Construction of the People's
Republic of China
No. 156
Announcement of the Ministry of Construction on Publishing the National
Standard "Code for Design of Gas Transmission Pipeline Engineering"
"Code for Design of Gas Transmission Pipeline Engineering" has been approved as a national
standard with a serial number of GB 50251-2003, and this national standard will be implemented on
October 1, 2003. Therein, Article (Item) 3.2.8, 3.4.1, 3.4.3, 3.4.4, 3.4.6, 4.2.3, 4.2.4, 4.6.1, 5.1.2 (1),
6.4.4, 7.2.1 (4), 7 .2.2 (6) are compulsory provisions and must be enforced strictly.
Authorized by the Standard and Ration Institute of the Ministry of Construction, this code is
published and distributed by China Planning Publishing House.
Ministry of Construction ofthe People's Republic of China
June 10,2003
Foreword
According to the requirements of Document Jian Biao [200 1] No. 87 issued by the Ministry of
Construction (MOC)-"Notice on Printing the Development and Revision Plan of National
Engineering Construction Standards from 2000 to 2001 ", Southwest China Branch of China Petroleum
Group En~ineering Design Co. Ltd. (Sichuan Petroleum Reconnaissance Design Institute) is
responsible for the overall revision of national standard "Code for Design of Gas Transmission
Pipeline Engineering" GB 50251-94.
This revision was modified ru.Jd finalized on the base of held many conferences to discuss
collected performance on original code of all concemed, and made reference to relevant international
standards. Not only tried and true provisions in original code is reserved in this code, but also added
Article 4.5 "Pipeline Structure", A1iicle 10.3 "Desiccation", Chapter 7 "Ground Environment of
Underground Natural Gas Storage" and Chapter 11 "Energy Saving, Environmental Protection, Labor
Safety and Hygiene" in this code, in order to enrich and enhance original code.
The Ministry of Construction is in charge of the explanation of the compulsory provisions of this
code; Subcommittee on Design of National Technical Committee on Petroleum Engineering
Construction of Standardization Administration of China is in charge of the administration of this
code; Southwest China Branch of China Petroleum Group Engineering Design Co. Ltd. is in charge of
the explanation of the specific technical contents. All relevant organizations are kindly requested to
sum up and accumulate your experiences in actual practices during the process of implementing this
code. The relevant opinions and advice, whenever necessary, can be posted or passed on to
Technology Department of Southwest China Branch of China Petroleum Group Engineering Design
Co. Ltd. (No. 28, Xiao guan miao houjie, Chengdu, China, 610017).
Chief Development Organizations, Participating Development Organizations and Chief Drafting
Staffs of this Code.
Chief Development Organization. Southwest China Branch of China Petroleum Group Engineering
Design Co. Ltd. (Sichuan Petroleum Reconnaissance Design
lnstitute)
Participating Development Organizations. Tianjin Dagang Oilfield Group Co., Ltd. China
Petroleum Planning and Engineering Institute
Major Drafting Staff. Ye Xueli, Zhang Shenliyuan, Ren Qirui, Xiang Bo, Wu Kexin,
Luo Dingming, Wei Liandun, Wang Shenming, Liu Xingguo,
Tang Shenan, Meng Fanbin, Liu Kehui, Cheng ZuLiang
Table of Contents
General Provisions ... 1
2 Terms ... 2
3 Gas Transmission Technology ... 5
3.1 General Requirements ... 5
3 .2 Process Design ... 5
3.3 Process Calculation and Analysis ... 6
3.4 Safety Discharge of Gas Transmission Pipeline ... 9
4 Route ... 11
4.1 Route Selection ... 11
4.2 Division of Location Class ... 12
4.3 Pipelining ... 13
4.4 Setting of Block Valves ... 17
4.5 Route Structures ... 17
4.6 Marks ... 18
5 Structure Design of Pipelines and Pipeline Auxiliaries ... 19
5.1 Calculation of the Strength and Stability of Pipelines ... 19
5.2 Materials ... 21
5.3 PipeAuxiliaries ... 21
6 Gas Transtnission Station ... 24
6.1 Installation Principles of Gas Transmission Station ... 24
6.2 Design of Pressure Adjustment and Measurement... 24
6.3 Pigging Design ... 24
6.4 Layout of Compressor and Design Principles of Workshop ... 25
6.5 Compressor Station Technology and Auxiliary System ... 26
6.6 Lectotype and Allocation of Compressor Unit... 27
6.7 Safety Protection of Compressor Unit... 28
6.8 Instation Pipeline ... 28
7 Ground Facilities of Underground Gas Storage ... 30
7.1 General Require1nents ... 30
7.2 Ground Technology ... 30
7.3 Equipment Selection ... 31
7.4 Auxiliary System ... 31
8 Monitoring and System Scheduling ... 32
8.1 General Requirements ... 32
8.2 System Scheduling ... 32
8.3 Controlled Station ... 33
8.4 Monitoring ... 34
8.5 Co1nrnunication ... 34
9 Auxiliary F'acilities ... 35
9.1 Power Supply Distribution ... 35
9.2 Water Supply and Drainage, Fire Protection ... 37
9.3 Heating, Ventilation and Air Condition ing ... 38
10 Welding and Inspection, Pigging, Pressure Test and Drying ... 40
1 0 .l Welding and Inspection ... 40
10.2 Pigging and Pressure Test ...42
10.3 Drying ... 43
11 Energy Conservation, Environmental Protection, Labor Security and Sanitation ...45
11.1 Energy Conservation ... 45
11.2 Enviromnental Protection ... 45
11.3 Labor Secw·ity and Sanitation ... 46
Appendix A Technical Calculation of Gas Pipeline ...47
Appendix B Axial Stress Calculation and Equivalent Stress Checking of Restrained Buried Straight
Pipeline Section ... 48
Appendix C Calculation of E lbow Combined Stress under Co-action of 1J1temal Pressure and
Temperature Difference ... 49
Appendix D Design Parameters of Pipe Laying Conditions ... 51
Appendix E Calculation of the Compound Stress Caused by Expanding of Pipe Accessories ... 52
Appendix G Shaft Power Calculation of Compressor... 57
Appendix H Type of Welding Joint for Pipe Ends ... 58
Explanation of Wording in This Code ... 61
1 General Provisions
1.0.1 This code is formulated with a view to follow out relevant national technical and economic
policies in design of gas transmission pipeline engineering, unified specification, and realize state-of-
art technology, economic feasibi lity, safety and usability, guaranteed quality.
1.0.2 This code is app licable to design 0f overland gas transmission pipeline engineering.
1.0.3 Design of gas transmission pipeline engineering shall be in compliance with the following
principles.
1 Environment protection. energy conservation and land conservation; manage the interrelation
of railway, highway and river all right;
2 Adopt advanced techniques and made efforts to absorb new scientific and technological
achievements in both China and abroad;
3 Optimize design proposal, determine the economic feasibility of gas transmission technology
and optimal technological parameter.
1.0.4 Design of gas transmission pipeline engineering, not only the requ irements stipulated in this
code but also those in the current relevant ones of the nation shall be complied with.
2 Terms
2.0.1 Pipeline gas
Natural gas and coal gas transported by pipeline.
2.0.2 Gas transmission pipeline project
Natural gas and coal gas transmission pipeline project. Generally, include the following projects.
gas pipeline, gas transmission station, pipeline traversing (spanning) facil ities and auxiliary product...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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