GB/T 45161-2024 Technical specification of safety valves for liquid hydrogen vessels
1 Scope
This document specifies technical requirements, test methods, inspection rules, marking, painting, packaging, transportation and storage of safety valves for liquid hydrogen vessels.
This document is applicable to safety valves for liquid hydrogen vessels with nominal size not greater than DN200, setting pressure not less than 0.1MPa, temperature not less than -254℃, and single phase liquid hydrogen evaporating gas as the medium (including spring direct load safety valves and pilot operated safety valves).
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 12224 General requirements for industrial steel valves
GB/T 12241 Safety valves - General requirements
GB/T 12242 Pressure relief devices - Performance test code
GB/T 12243 Spring loaded safety valves
GB/T 13305 Method for determining content of the α-phase in stainless steels
GB/T 22652 Overlaying-welding procedure qualification for valves sealing face
GB/T 24499 Technology glossary for gaseous hydrogen, hydrogen energy and hydrogen energy system
GB/T 24921.1 Sizing, selection and installation of pressure relieving valves for petrochemical industries - Part 1: Sizing and selection
GB/T 26481 Industrial valves test for fugitive emissions
GB/T 26640 Specification for minimal thickness of the shell of valves
GB/T 28778 Pilot operated safety valves
GB/T 29026 Spring loaded safety valve for cryogenic service
GB/T 40011 Pilot safety valve for cryogenic fluid service
GB/T 40060 Technical requirements for storage and transportation of liquid hydrogen
GB/T 40079 Classification system and qualification procedures for fugitive emission type testing of valves
HG 20202 Code for construction and acceptance of degreasing project
JB/T 6440 Methods of radiographic examination for steel castings valves
JB/T 6440-2008 Methods of radiographic examination for steel castings valves
JB/T 6903 Methods for ultrasonic examination of steel gorgings for valves
JB/T 6903-2008 Methods for ultrasonic examination of steel gorgings for valves
JB/T 7248 Technical specification for low temperature service steel casting for valves
NB/T 47013.2 Nondestructive testing of pressure equipments - Part 2: Radiographic testing
NB/T 47013.2-2015 Non-destructive testing of pressure equipments - Part 2: Radiographic testing
NB/T 47013.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47013.5-2015 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47014 Welding procedure qualification for pressure equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 12241, GB/T 12242, GB/T 12243, GB/T 24499, GB/T 28778 and the following apply.
3.1
hydrostatic strength test
test of rupture resistance of pressure shell at normal temperature, specified liquid pressure and specified time
3.2
design pressure
allowable maximum pressure of the pressure-bearing parts of the safety valve for liquid hydrogen vessels at normal temperature specified in the design
3.3
cryogenic treatment
treatment process of immerse the parts in a vessel that is not higher than the temperature of liquid nitrogen for cooling until their temperature is stable, then maintain such temperature for 2h to 6h, and then take them out to return to room temperature naturally
3.4
valve category A
safety valve that may be discharged during the normal operation of the liquid hydrogen vessel without automatic control valve or discharge valve
3.5
valve category B
safety valve that does not discharge during the normal operation of the liquid hydrogen vessel with automatic control valve or discharge valve
4 Technical requirements
4.1 General requirements
4.1.1 Safety valves for liquid hydrogen vessels (hereinafter referred to as safety valves) shall meet the requirements of GB/T 12241, GB/T12243, GB/T 28778, GB/T 29026 and GB/T40011, in addition to the requirements of this document.
4.1.2 The determination of design pressure of safety valves shall meet the requirements of GB/T 12224. When the pressure-temperature rating of some materials with elastic sealing structure or internal parts is lower than the pressure-temperature rating of the body material, the design pressure shall be determined with the lower value.
4.1.3 The end connection of safety valves shall meet the requirements of GB/T 12241. If the purchaser has special requirements, the safety valves can be designed and manufactured according to the purchase technical agreement under the condition of ensuring the performance and safety of the safety valves.
4.1.4 Before assembly, all parts shall be cleaned, degreased and dried according to the methods specified in HG 20202, and the results shall meet the requirements of HG 20202.
4.2 Design requirements
4.2.1 Temperature adaptability
Within the predetermined pressure range, the safety valve shall be able to work normally between the required minimum temperature and 65°C.
4.2.2 Setting pressure
The setting pressure of safety valve shall be less than or equal to the difference between its design pressure and the excess pressure (setting pressure ≤ design pressure - excess pressure), and should not exceed the specified values of Annexes B and C of GB/T 24920-2010.
4.2.3 Safety valve shell
4.2.3.1 The safety valve shall be designed to discharge liquid to avoid the accumulation of liquid in the valve. Except as otherwise specified in the technical purchase agreement.
4.2.3.2 The safety valve shell shall have sufficient strength to ensure that no harmful deformation occurs under strength test and working conditions. It can withstand the stress caused by the change of medium pressure and temperature for a long time, the additional stress generated by the connecting pipe, and the total load of combined stress generated under the operating conditions.
4.2.3.3 When the safety valve is discharged, avoid the accumulation of solid matter in the valve body or at the outlet and cause failure due to the decrease of temperature.
4.2.3.4 Shell thickness shall meet the requirements of GB/T 26640.
Contents Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Technical requirements 4.1 General requirements 4.2 Design requirements 4.3 Performance requirements 4.4 Materials 4.5 Non-destructive inspection 5 Test methods 5.1 Safety instruction 5.2 Marking Inspection 5.3 Dimension inspection of shell 5.4 Chemical composition of material 5.5 Mechanical properties of material 5.6 Normal temperature performance test 5.7 Low temperature performance test of liquid hydrogen 5.8 Anti-static test 5.9 Cleanliness inspection 5.10 Vibration and impact tests 5.11 Non-destructive inspection 6 Inspection rules 6.1 Inspection items 6.2 Delivery inspection 6.3 Type testing 7 Marking 7.1 General 7.2 Body marking 7.3 Nameplate marking 8 Painting, packaging, transportation and storage Annex A (Informative) Working conditions for calculation of runner size and rated displacement Annex B (Informative) Designations of metal materials for main parts of valves Bibliography
