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Valves for liquid hydrogen - General specification
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GB/T 45027-2024: Valves for liquid hydrogen - General specification
---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/GBT45027-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
CCS F 19
Valves for liquid hydrogen - General specification
Issued on. DECEMBER 31, 2024
Implemented on. APRIL 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 7
4 Technical requirements... 8
5 Test methods... 25
6 Inspection rules... 47
7 Marking... 50
8 Packaging, storage and transportation... 51
Appendix A (Normative) Welding requirements... 53
Appendix B (Informative) Recommended designations of metal materials for main
valve parts... 56
Appendix C (Informative) Recommended minimum length of body extension... 57
Appendix D (Informative) Pneumatic control valve leakage rate coefficient... 59
Appendix E (Informative) Liquid hydrogen temperature and pressure correspondence
table... 60
Bibliography... 61
1 Scope
This document specifies the technical requirements, test methods, inspection rules,
marking, packaging, storage and transportation requirements for valves for liquid
hydrogen (hereinafter referred to as “valves”).
This document is applicable to globe valves, check valves, ball valves, pneumatic
control valves and fusible cut-off emergency shut-off valves for liquid hydrogen with
nominal pressure not exceeding PN160, pressure grade not exceeding Class900,
insulated by vacuum jacket and connected by welding.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 150.4, Pressure vessels - Part 4.Fabrication, inspection and testing, and
acceptance
GB/T 228.1, Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 229, Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 1954, Methods of measurement for ferrite content in austenitic Cr-Ni
stainless steel weld metals
GB/T 2423.5, Environmental testing - Part 2.Test methods - Test Ea and guidance.
Shock
GB/T 2423.10, Environmental testing - Part 2.Test methods - Test Fc. Vibration
(sinusoidal)
3 Terms and definitions
Terms and definitions determined by GB/T 21465 and the following ones are applicable
to this document.
3.1
maximum allowable working pressure
The maximum pressure that the valve pressure-bearing parts are allowed to withstand
when the medium temperature is -20 ℃ ~ 38 ℃.
Note. The maximum allowable working pressure is the lowest value among the
maximum allowable working pressures of all pressure-bearing parts of the valve.
3.2
rated minimum temperature
The minimum operating temperature of the valve.
3.3
body extension
The valve body structure that is appropriately lengthened between the connection end
of the valve body and the valve cover.
4 Technical requirements
4.1 Basic requirements
4.1.1 In addition to complying with the requirements of this document, valves shall also
comply with the requirements of relevant product standards such as GB/T 4213, GB/T
12235, GB/T 12236, GB/T 12237 and GB/T 24918-2010.
4.1.4 For valves with vacuum jacket structure, the design pressure of the jacket shall
not be less than the discharge pressure set by the vacuum jacket explosion-proof device
of the pipeline system, and the design external pressure shall not be less than 0.1 MPa.
4.1.5 Double-seat valves shall be equipped with pressure relief holes or self-relieving
valve seats. The pressure relief direction should be the upstream high-pressure side, and
the pressure relief direction should be marked on the outside of the valve. Valves with
self-relieving seat structures shall be subjected to pressure relief tests.
4.1.8 The valve structure shall not be a gate valve, but a globe valve or a ball valve may
be used as the emergency shut-off valve.
4.1.9 Before assembly, all valve parts in contact with hydrogen media shall be
degreased and dried. The degreasing and inspection shall comply with the requirements
of HG 20202.
4.2 Materials
4.2.1 The selection of materials shall evaluate the influence of chemical properties,
physical properties and process properties of the materials, as well as the compatibility
with hydrogen medium, and shall comply with the provisions of GB/T 29729.
4.2.4 The material used to manufacture bellows should preferably be S31608 or S31603.
4.2.5 The metal material used for the pressure-bearing parts of the valve shall be
austenitic stainless steel and shall be solution-treated. The metallographic structure of
the material shall be stable, and the chemical composition analysis and room
temperature mechanical properties of the material shall comply with the requirements
of the corresponding material standards.
4.2.8 The parts of the valve that come into contact with the liquid hydrogen medium in
the working state (such as the valve body, valve disc, ball, valve seat, valve stem, etc.)
shall be subjected to cryogenic treatment for no less than 2 times before finishing.
4.2.11 When non-metallic materials are used as valve insulation materials, they shall be
compatible with oxygen and shall comply with the requirements of GB/T 31481.
4.3 Structural design
4.3.1 Structural type
The schematic diagrams of typical valve structures are shown in Figures 1 ~ 7.
4.4 Room temperature performance
4.4.1 Shell strength
Shall comply with the requirements of 7.1 of GB/T 13927-2022.
4.4.2 Sealing performance at room temperature
The sealing performance of the valve at room temperature shall comply with the
provisions of Table 3, and the normal temperature valve seat sealing performance of the
pneumatic control valve shall comply with the provisions of Table 4.
5 Test methods
Warning ─ When conducting pressure tests, it is necessary to evaluate the safety
of the test gas or liquid pressure and the emission of hydrogen; when conducting
low-temperature performance tests, it is necessary to evaluate the safety of the test
medium, test system, test environment, and the safety protection of the test
operators.
5.1 Test conditions
5.1.1 Test environmental conditions
Normal temperature performance test environmental conditions. temperature is 25 ℃
± 10 ℃; relative humidity is 20% ~ 80%.
5.1.2 Test medium
The test medium shall comply with the following requirements.
5.1.3 Instruments and apparatuses
Measuring instruments, meters, gauges and other equipment shall be within the validity
period of verification or calibration, and the measurement accuracy shall comply with
the requirements of Table 6.
5.2 Materials
5.2.1 Chemical composition analysis
The processed surface on the pressure-bearing material body or on the test bars of the
same batch shall be analyzed by spectral analysis, or powder sampled for chemical
analysis. Each batch of materials for main pressure-bearing parts (with the same furnace
number, same manufacturing process, and same heat treatment conditions) shall be
inspected at least once.
5.5 Room temperature performance
5.5.1 Shell strength
5.5.1.1 Perform shell test on the test valve in accordance with the method specified in
6.1 of GB/T 13927-2022.
6 Inspection rules
6.1 Factory inspection
Valves shall be inspected one by one before leaving the factory and can only leave the
factory after passing the inspection. Factory inspection items shall comply with the
requirements of Table 11.
6.2 Type test
6.2.1 Type test shall be carried out in any of the following cases.
6.2.2 Type test items shall comply with the requirements of Table 11.Mass production
can only be carried out after all type test items are qualified.
7 Marking
7.1 General requirements
Valves shall be marked in accordance with the provisions of GB/T 12220 and shall
comply with the provisions of this document. The valve nameplate material shall be
austenitic stainless steel.
7.2 Markings on the valve body
The valve body shall include at least the following.
7.3 Markings on the plate
The valve plate shall include at least the following.
7.4 Other markings
7.4.1 Valves with fire-resistant construction shall be marked “FD”.
8 Packaging, storage and transportation
8.1 Except for the drive unit, the inner and outer surfaces of the valve shall not be
painted or sprayed with any anti-rust layer.
8.2 After the inspection and test, the inside of the valve shall be kept free of oil, debris
and dry. The entire valve shall be sealed and packed, and nitrogen protection should be
used.
8.4 The packaging site shall be clean and dry. Appropriate protective measures shall be
taken during packaging. Valves shall not come into contact with bare hands or unclean
objects, and shall be prevented from iron ion contamination.
8.5 The packaging materials shall be able to meet the requirements of environmental
corrosion and shall be wrapped and sealed with moisture-proof materials.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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