1.0.1 This code was formulated with the view to implementing the national relevant regulations, principles and policies, unifying technical requirements, realizing advanced technology, economic rationality, safety and usability and guaranteeing quality in gas transmission pipeline engineering design.
1.0.2 This code is applicable to the design of onshore constructed, extended and renovated gas transmission pipeline engineering.
1.0.3 Gas transmission pipeline engineering shall be designed according to the following requirements:
1 Environmental protection, energy conservation, land conservation, and the relationship with railway, highway, transmission line, river, urban and rural planning well treated;
2 Active application of new technology, process, equipment and materials;
3 Optimization of design scheme, and determination of economic and reasonable gas transmission process and the optimal parameters;
4 Reasonable application of the original facilities and conditions in the expansion project;
5 Overall design for staged project and establishment of phased implementation plan.
1.0.4 The design of gas transmission pipeline engineering shall not only meet the requirements stipulated in this code, but shall also comply with those stipulated in the current relevant standards of the nation.
2 Terminologies
2.0.1 Pipeline gas
Natural gas, coalbed gas and coal-based natural gas transmitted via pipeline
2.0.2 Gas transmission pipeline project
Natural gas, coalbed gas and coal-based natural gas pipeline transmission engineering. It generally includes gas transmission pipeline, gas transmission station, pipeline passing (crossing) and auxiliary production facilities, etc.
2.0.3 Gas transmission station
A generic term for varied process stations in gas transmission pipeline engineering. It generally includes gas transmission initial station, gas transmission terminal station, compressor station, gas receiving station, gas distributing station and pigging station, etc.
2.0.4 Gas transmission initial station
The origin station of gas transmission pipeline. It generally has such functions as separation, voltage regulation, metering and pigging.
2.0.5 Gas transmission terminal station
Terminal station of gas transmission pipeline. It generally has such functions as separation, voltage regulation, metering, pigging and distribution.
2.0.6 Gas receiving station
A station set along the gas transmission pipeline for receiving gas from gas transmission branch lines, generally with such functions as separation, voltage regulation, metering and pigging.
2.0.7 Gas distributing station
A station set along the gas transmission pipeline for distributing gas to users, generally with such functions as separation, voltage regulation, metering and pigging.
2.0.8 Compressor station
A station set along the gas transmission pipeline that uses a compressor to pressurize pipeline gas.
1 General Provisions
2 Terminologies
3 Gas Transmission Process
3.1 General Requirements
3.2 Process Design
3.3 Process Calculation and Analysis
3.4 Safety Relief of Gas Transmission Pipeline
4 Pipeline Route
4.1 Route Selection
4.2 Location Classification and Determination of Design Factors
4.3 Pipeline Laying
4.4 Parallel Pipeline Laying
4.5 Setting of Block Valve Station
4.6 Corrosion Protection and Insulation of Pipeline
4.7 Hydraulic Protection of Pipeline
4.8 Pipeline Marking
5 Structural Design of Pipelines and Auxiliaries
5.1 Calculation of Pipeline Strength and Stability
5.2 Materials
5.3 Pipe Auxiliaries
6 Gas Transmission Station
6.1 Setting of Gas Transmission Station
6.2 Station Process
6.3 Arrangement and Plant Design of Compressor Unit
6.4 Compressor Station Process and Auxiliary System
6.5 Selection and Configuration of Compressor Unit
6.6 Safety Protection of Compressor Unit
6.7 Piping in Station
6.8 Corrosion Protection and Insulation of Pipeline and Equipment in the Station
7 Ground Facilities of Underground Gas Storage
7.1 General Requirements
7.2 Ground Process
7.3 Selection of Equipment
8 Instrumentation and Automatic Control
8.1 General Requirements
8.2 Dispatch Control Center
8.3 Station Control System and Remote Terminal Unit
8.4 Monitor and Control of Gas Transmission Pipeline
9 Communication
10 Auxiliary Production Facilities
10.1 Power Supply and Distribution
10.2 Water Supply and Drainage and Fire Protection
10.3 Heating, Ventilation, and Air Conditioning (HVAC)
10.4 Heating
11 Welding and Inspection, Pigging and Pressure Testing, Drying and Replacement
11.1 Welding and Inspection
11.2 Pigging, Caliper Measuring and Pressure Test
11.3 Drying and Replacement
Appendix A Calculation of Gas Pipeline Process
Appendix B Axial Stress Calculation and Equivalent Stress Check of Constrained Buried Straight Pipeline Section
Appendix C Calculation of Combined Stress of Elbows under Combined Action of Internal Pressure and Temperature
Appendix D Design Parameters of Pipeline Laying Condition
Appendix E Calculation of Comprehensive Stress Resulted From Pipe Fitting Expansion
Appendix F Structure and Calculation of Tee and Opening Reinforcement
Appendix G Calculation of Compressor Shaft Power
Appendix H Pipe End Welding Joint Type
Appendix J Recommended Practice of Classification of Explosive Dangerous Zone in Gas Transportation Station and Valve Vault
Appendix K Recommended Practice of Buried Pipeline Hydraulic Pressure Strength Test
Explanation of Wording in This Code
List of Quoted Standards
1.0.1 This code was formulated with the view to implementing the national relevant regulations, principles and policies, unifying technical requirements, realizing advanced technology, economic rationality, safety and usability and guaranteeing quality in gas transmission pipeline engineering design.
1.0.2 This code is applicable to the design of onshore constructed, extended and renovated gas transmission pipeline engineering.
1.0.3 Gas transmission pipeline engineering shall be designed according to the following requirements:
1 Environmental protection, energy conservation, land conservation, and the relationship with railway, highway, transmission line, river, urban and rural planning well treated;
2 Active application of new technology, process, equipment and materials;
3 Optimization of design scheme, and determination of economic and reasonable gas transmission process and the optimal parameters;
4 Reasonable application of the original facilities and conditions in the expansion project;
5 Overall design for staged project and establishment of phased implementation plan.
1.0.4 The design of gas transmission pipeline engineering shall not only meet the requirements stipulated in this code, but shall also comply with those stipulated in the current relevant standards of the nation.
2 Terminologies
2.0.1 Pipeline gas
Natural gas, coalbed gas and coal-based natural gas transmitted via pipeline
2.0.2 Gas transmission pipeline project
Natural gas, coalbed gas and coal-based natural gas pipeline transmission engineering. It generally includes gas transmission pipeline, gas transmission station, pipeline passing (crossing) and auxiliary production facilities, etc.
2.0.3 Gas transmission station
A generic term for varied process stations in gas transmission pipeline engineering. It generally includes gas transmission initial station, gas transmission terminal station, compressor station, gas receiving station, gas distributing station and pigging station, etc.
2.0.4 Gas transmission initial station
The origin station of gas transmission pipeline. It generally has such functions as separation, voltage regulation, metering and pigging.
2.0.5 Gas transmission terminal station
Terminal station of gas transmission pipeline. It generally has such functions as separation, voltage regulation, metering, pigging and distribution.
2.0.6 Gas receiving station
A station set along the gas transmission pipeline for receiving gas from gas transmission branch lines, generally with such functions as separation, voltage regulation, metering and pigging.
2.0.7 Gas distributing station
A station set along the gas transmission pipeline for distributing gas to users, generally with such functions as separation, voltage regulation, metering and pigging.
2.0.8 Compressor station
A station set along the gas transmission pipeline that uses a compressor to pressurize pipeline gas.
Contents of GB 50251-2015
1 General Provisions
2 Terminologies
3 Gas Transmission Process
3.1 General Requirements
3.2 Process Design
3.3 Process Calculation and Analysis
3.4 Safety Relief of Gas Transmission Pipeline
4 Pipeline Route
4.1 Route Selection
4.2 Location Classification and Determination of Design Factors
4.3 Pipeline Laying
4.4 Parallel Pipeline Laying
4.5 Setting of Block Valve Station
4.6 Corrosion Protection and Insulation of Pipeline
4.7 Hydraulic Protection of Pipeline
4.8 Pipeline Marking
5 Structural Design of Pipelines and Auxiliaries
5.1 Calculation of Pipeline Strength and Stability
5.2 Materials
5.3 Pipe Auxiliaries
6 Gas Transmission Station
6.1 Setting of Gas Transmission Station
6.2 Station Process
6.3 Arrangement and Plant Design of Compressor Unit
6.4 Compressor Station Process and Auxiliary System
6.5 Selection and Configuration of Compressor Unit
6.6 Safety Protection of Compressor Unit
6.7 Piping in Station
6.8 Corrosion Protection and Insulation of Pipeline and Equipment in the Station
7 Ground Facilities of Underground Gas Storage
7.1 General Requirements
7.2 Ground Process
7.3 Selection of Equipment
8 Instrumentation and Automatic Control
8.1 General Requirements
8.2 Dispatch Control Center
8.3 Station Control System and Remote Terminal Unit
8.4 Monitor and Control of Gas Transmission Pipeline
9 Communication
10 Auxiliary Production Facilities
10.1 Power Supply and Distribution
10.2 Water Supply and Drainage and Fire Protection
10.3 Heating, Ventilation, and Air Conditioning (HVAC)
10.4 Heating
11 Welding and Inspection, Pigging and Pressure Testing, Drying and Replacement
11.1 Welding and Inspection
11.2 Pigging, Caliper Measuring and Pressure Test
11.3 Drying and Replacement
Appendix A Calculation of Gas Pipeline Process
Appendix B Axial Stress Calculation and Equivalent Stress Check of Constrained Buried Straight Pipeline Section
Appendix C Calculation of Combined Stress of Elbows under Combined Action of Internal Pressure and Temperature
Appendix D Design Parameters of Pipeline Laying Condition
Appendix E Calculation of Comprehensive Stress Resulted From Pipe Fitting Expansion
Appendix F Structure and Calculation of Tee and Opening Reinforcement
Appendix G Calculation of Compressor Shaft Power
Appendix H Pipe End Welding Joint Type
Appendix J Recommended Practice of Classification of Explosive Dangerous Zone in Gas Transportation Station and Valve Vault
Appendix K Recommended Practice of Buried Pipeline Hydraulic Pressure Strength Test
Explanation of Wording in This Code
List of Quoted Standards
