Cryogenic valves for hydrogen - General test method
1 Scope
This document describes the test items, test conditions, test media, instruments and apparatus, test preparation, test procedures and data processing of the performance test of cryogenic valves for hydrogen (hereinafter referred to as "valves").
This document is applicable to welded or flanged globe valves, check valves, ball valves, butterfly valves, pneumatic control valves and emergency shutoff valves with medium temperature not higher than -196℃ and not lower than the boiling point temperature of liquid or cold hydrogen at standard atmospheric pressure, nominal pressure not higher than PN160, and pressure class not higher than Class 900.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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)
GB/T 3836.1 Explosive atmospheres - Part 1: Equipment - General requirements
GB/T 4208 Degrees of protection provided by enclosure (IP code)
GB/T 4213-2008 Pneumatic industrial process control valves
GB 4962 Technical safety regulation for gaseous hydrogen use
GB/T 13927-2008 Industrial valves - Pressure testing
GB/T 18442 (all parts) Static vacuum insulated cryogenic pressure vessels
GB/T 24159 Welded insulated cylinders
GB/T 24918-2010 Cryogenic emergency shutoff valve
GB/T 26480 Valve inspection and testing
GB/T 26481 Valve test for fugitive emissions
GB/T 29729 Essential requirements for the safety of hydrogen systems
GB/T 40079 Classification system and qualification procedures for fugitive emission type testing of valves
GB 50177 Design code for hydrogen station
HG 20202 Code for construction and acceptance of degreasing project
JB/T 6899 Fire resistance test of valves
JB/T 8527-2015 Metallic sealing butterfly valve
JB/T 11150-2011 Bellows sealing steel globe valve
T/CATSI 05006 Special technical requirements for static vacuum-insulated liquid hydrogen pressure vessels
T/CGMA 0407-2022 Cryogenic valves for hydrogen - General technical specifications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 21465 and T/CGMA 0407-2022 as well as the following apply.
3.1
outside cooling method
method for reaching the required test temperature by soaking the valve in cooling medium
Note: It is also referred to as soaking method.
3.2
inside cooling method
method for reaching the required test temperature by flowing the cooling medium through the valve cavity
Note: It is also referred to as flow method.
3.3
purge
operation of keeping inert gas flowing continuously in the valve cavity before the cryogenic performance test
3.4
precool
process of lowering the temperature of the inner wall of a valve to the temperature of cryogenic test and maintaining stability by continuously passing the cryogenic medium through the valve cavity or continuously soaking the valve in the cryogenic liquid medium before the cryogenic performance test
4 Test items
See Table 1 for the performance test items of valves.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test items
5 Test environment conditions
6 Test media
7 Instruments and apparatus
8 Test preparation
9 Test procedures and data processing
9.1 Test procedures
9.2 Normal temperature performance test
9.3 Shell crack resistance test
9.4 Cryogenic performance test
9.5 Anti-static test
9.6 Fire resistance test
9.7 Vibration resistance test
9.8 Test for resistance to shock
9.9 Degreasing inspection
10 Test report
Annex A (Informative) Corresponding relationship between temperature and pressure of liquid hydrogen
Figure 1 Block diagram of cryogenic test method selection
Figure 2 Schematic diagram of devices for cryogenic performance test by outside cooling method
Figure 3 Schematic diagram of devices for cryogenic performance test by inside cooling method
Table 1 Test items
Table 2 Accuracy requirements of measuring instruments and apparatus
Table 3 Test procedures for valves for static vessels and pipelines
Table 4 Test procedures for valves for mobile vessels, tankers and tank cars
Table 5 Temperature requirements for cryogenic test
Table 6 Pressure increment for the seat sealing test
Table A.1 Corresponding relationship between temperature and pressure of liquid hydrogen in saturated state
