SY/T 7820-2024 Specification for design of hydrogen transmissionpipeline engineering English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 7820-2024
Specification for design of hydrogen transmission pipeline engineering
输氢管道工程设计规范
(English Translation)
Issue date: 2024-12-25 Implementation date: 2025-06-25
Issued by National Development and Reform Commission, P.R.C
Contents
1 General provisions
2 Terms
3 Hydrogen transmission process
3.1 Basic provisions
3.2 Process design
3.3 Process calculation and analysis
3.4 Safety relief of hydrogen transmission pipeline
4 Materials
4.1 General provisions
4.2 Steel pipe
4.3 Pipe accessories
5 Pipeline route
5.1 Route selection
5.2 Regional classification and determination for design factors
5.3 Pipeline laying
5.4 Pipeline block valve (station)
5.5 Corrosion prevention and insulation for pipeline
5.6 Pipeline auxiliary
6 Structural design for pipe and accessories
6.1 Wall thickness calculation
6.2 Calculation for pipeline strength and stability
6.3 Structural design for pipe accessories
7 Hydrogen transportation station
7.1 Station process
7.2 Installation of piping in the station
7.3 Piping stress analysis in station
7.4 Corrosion prevention and thermal insulation for piping and equipments in the station
7.5 Site selection
7.6 Regional layout
7.7 General layout
8 Auxiliary projects
8.1 Instrumentation and automatic control
8.2 Power supply and distribution
8.3 Communication
8.4 Architecture and structure
8.5 Heating, ventilation, and air conditioning
8.6 Water supply, drainage and fire fighting
9 Welding and inspection
9.1 Welding
9.2 Inspection
10 Pigging and pressure testing, drying and replacement
10.1 Pigging and pressure testing
10.2 Drying and replacement
Appendix A Process hydraulic calculation, hydraulic friction coefficient and temperature calculation formulas along the pipeline system
Appendix B Identification and risk assessment of high consequence areas
Appendix C Stress calculation for constrained buried straight pipeline and bending
Appendix D Calculation for radial deformation for steel pipeline
Appendix E Starting point for fire separation distance
Appendix F Hazardous areas classification for hydrogen transmission station and block valve station
Explanation of wordingin this code
List of quoted standards
Addition: Explanation of provisions
1 General Provisions
1.0.1 This code is formulated to implement the current relevant national policies and guidelines in the design of hydrogen transmission pipeline engineering, unify technical requirements, and achieve safety, applicability, advanced technology, and economic rationality.
1.0.2 This code applies to the design of onshore hydrogen transmission pipeline engineering and does not apply to the design of pipeline engineering at the gas source end and user end.
1.0.3 The design of hydrogen transmission pipeline engineering shall ensure safety, protect the environment, focus on quality, conserve resources, and properly handle interrelationships with upstream and downstream enterprises, the social environment, the natural environment, other projects, and urban-rural planning.
1.0.4 The design of hydrogen transmission pipeline engineering shall rationally select design parameters and optimize design schemes based on pipeline construction and operational experience, as well as absorbing advanced scientific and technological achievements from domestic and international sources.
1.0.5 In addition to complying with this code, the design of hydrogen transmission pipeline engineering shall also comply with the current relevant national standards.
2 Terms
2.0.1 hydrogen transmission pipeline
Pipelines for transmitting hydrogen gas and gas pipelines where the hydrogen mole fraction exceeds 3%.
2.0.2 gas transmission pipeline
Pipelines for transmitting natural gas, coalbed methane, and coal-based synthetic natural gas.
2.0.3 hydrogen transmission station
A general term for various types of process stations in hydrogen transmission pipeline engineering, including initial stations, compressor stations, offtake stations, injection stations, pigging stations, and terminal stations.
2.0.4 hydrogen embrittlement
A general term describing the phenomenon of metal failure resulting from the interaction between hydrogen atoms and metals.
2.0.5 pipe accessories
Pipeline-specific pressure-bearing components such as fittings, flanges, valves, pig launchers/receivers, headers, assemblies, insulating flanges or insulating joints.
3 Hydrogen Transmission Process
3.1 Basic Requirements
3.1.1 The design transmission capacity of a hydrogen transmission pipeline shall be calculated based on the annual or daily maximum gas transmission volume specified in the design commission or contract.
3.1.2 The quality of hydrogen entering the hydrogen pipeline shall not be lower than the technical requirements of the current national standard "Hydrogen — Part 1: Industrial hydrogen" GB/T 3634.1 and Table 3.1.2.
3.1.3 For gas transmission pipelines containing more than 3% hydrogen, the hydrogen quality and impurity content shall meet the hydrogen transmission requirements of Clause
3.1.2 of this code. Other gases shall also comply with the requirements of the current national standards "Gas quality requirements for natural gas entering long-distance transmission pipelines" GB/T 37124 and "Code for design of gas transmission pipeline engineering" GB 50251.
3.1.4 The design pressure and diameter of the hydrogen transmission pipeline shall be determined based on gas source conditions, user requirements, pipe material properties, and safety factors around the pipeline, following technical and economic comparison and selection.
3.2 Process Design
3.2.1 Hydrogen transmission process design shall at least include the following content:
1 Hydraulic and thermal analysis of the process system.
2 Pipe diameter and design pressure of the pipeline.
3 Number of hydrogen transmission stations and station spacing.
4 Process parameters and procedures of hydrogen transmission stations.
5 System process flow.
3.2.2 The process design scheme shall be determined by conducting multi-scheme technical and economic comparison and selection, considering factors such as gas source pressure, offtake volume, injection volume, pipeline diameter, outlet pressure, power supply conditions, and auxiliary facilities.
3.2.3 The process design scheme shall perform peak-shaving analysis based on gas source and user conditions, and propose peak-shaving methods.
3.2.4 Hydrogen transmission stations with offtake functions should be equipped with gas limiting and pressure limiting facilities.
3.2.5 Hydrogen transmission stations receiving gas sources shall be equipped with gas quality monitoring facilities.
3.3 Process Calculation and Analysis
3.3.1 Hydrogen transmission pipeline process design shall at least be provided with the following data:
1 Gas source composition.
2 Number, location, and gas supply volume of gas sources.
3 Pressure and temperature of gas sources.
4 Number, location, gas consumption volume, pressure requirements, and temperature conditions of users.
5 Ground temperature at pipeline burial depth.
3.3.2 The hydraulic calculation, hydraulic friction coefficient calculation formulas, and temperature calculation formulas along the pipeline for hydrogen transmission pipelines shall be executed according to the provisions of Appendix A of this code.
3.3.3 Based on the actual requirements of the project, steady-state and dynamic simulation analysis of the hydrogen transmission pipeline system should be conducted to determine the number of compressor stations, compression ratios, compressor calculated power, and power fuel consumption under different working conditions, as well as the flow rate, pressure, temperature at each node of the pipeline system, and the gas storage capacity of the pipeline.
3.4 Safety Relief of Hydrogen Transmission Pipelines
3.4.1 Hydrogen transmission stations should be equipped with pressure relief and venting facilities upstream of the inlet block valve and downstream of the outlet block valve.
