GB/T 45027-2024 Valves for liquid hydrogen — General specification
1 Scope
This document specifies the technical requirements, test methods, inspection rules, marking, packaging, storage and transportation requirements of valves for liquid hydrogen (hereinafter referred to as "valves").
This document is applicable to globe valves, check valves, ball valves, pneumatic control valves and fusing cut-off emergency shut-off valves for liquid hydrogen with nominal pressures not greater than PN160 and pressure classes not greater than Class 900, with vacuum jacketed insulation and welded connections.
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 150.4 Pressure vessels - Part 4: Fabrication,inspection and testing, and acceptance
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: Tests methods - Test Fc: Vibration (sinusoidal)
GB/T 2653 Bend test methods on welded joints
GB/T 3634.2 Hydrogen - Part 2: Pure hydrogen, high pure hydrogen and ultra-pure hydrogen
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 Pneumatic industrial process control valves
GB/T 4844 Pure helium, high pure helium and ultra pure helium
GB 4962 Technical safety regulation for gaseous hydrogen use
GB/T 8979 Pure nitrogen, high purity nitrogen and ultra-pure nitrogen
GB/T 9124 (all parts) Steel pipe flanges
GB/T 12220 Industrial valves - Marking
GB/T 12221 Metal valves - Face to face, end to end, center to face and center to end dimensions
GB/T 12222 Multi-turn valve actuator attachments
GB/T 12223 Part-turn valve actuator attachments
GB/T 12224 General requirements for industrial steel valves
GB/T 12235 Steel globe valves and lift check valve for petroleum, petrochemical and allied industries
GB/T 12236 Steel swing check valve for petroleum petrochemical and allied industries
GB/T 12237 Steel ball valves for petroleum, petrochemical and allied industries
GB/T 13305 Method for determining content of the α-phase in stainless steels
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
JB/T 7928 General purpose industrial valve - Delivery specification
JB/T 11150-2011 Bellows sealing steel globe valve
NB/T 47013.2-2015 Non-destructive testing of pressure equipments - Part 2: Radiographic testing
NB/T 47013.3 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing
NB/T 47013.5-2015 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47014-2011 Welding procedure qualification for pressure equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 21465 and the following apply.
3.1
maximum allowable working pressure
maximum allowable pressure of the pressure-bearing components of the valve at medium temperature of -20℃ to 38℃
Note: It is the minimum value among the maximum allowable working pressures of all pressure-bearing components of the valve.
3.2
rated minimum temperature
minimum service temperature of the valve
3.3
body extension
valve body structure that is lengthened appropriately between the valve body and the valve cap connection
3.4
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.
3.5
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.
4 Technical requirements
4.1 Basic requirements
4.1.1 Valves shall not only meet the requirements of this document, but also meet those of relevant product standards such as GB/T 4213, GB/T 12235, GB/T 12236, GB/T 12237 and GB/T 24918-2010.
4.1.2 The pressure-temperature rated value of the valve shall meet the requirements of GB/T 12224. The allowable pressure-temperature rating of the valve shall be determined according to the smaller of the pressure temperature rating of the non-metallic seal used and the valve housing, and shall be clearly specified on the nameplate.
4.1.3 The valve shall be capable of normal operation and use from 60℃ to rated minimum temperature and within the range of maximum allowable working pressure.
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 explosion-proof device of the vacuum jacket of the pipeline system, and the design external pressure shall not be less than 0.1MPa.
4.1.5 The valve with double seat shall be equipped with pressure relief hole or self-pressure relief seat. 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 structure shall be tested for pressure relief.
4.1.6 Valves shall be designed with anti-static structure to ensure that the body, disc, stem and other components have electrical conductivity.
4.1.7 Valves with fire-resistant requirements shall be designed with fire-resistant structure.
4.1.8 Gate valve shall not be used as the type of construction of the valve, and globe valves or ball valve may be used for the type of construction of emergency shutoff valve.
4.1.9 All parts and components of valves in contact with hydrogen medium shall be degreased and dried before assembly. Degreasing treatment and inspection shall comply with HG 20202.
4.1.10 The welding of pressure-bearing parts of the valve shall meet the requirements of GB/T 150.4, GB/T 18442.4-2019 and NB/T 47014-2011, and the specific welding requirements shall meet the requirements of Annex A.
4.2 Materials
4.2.1 For the selection of materials, the chemical, physical and processing properties of the materials, as well as their compatibility with hydrogen medium shall be assessed, and shall meet the requirements of GB/T 29729.
4.2.2 The sealing pair, packing and gasket materials in direct contact with the liquid hydrogen medium shall be capable of normal service from the maximum service temperature to the rated minimum temperature and within the maximum allowable working pressure range.
4.2.3 The materials of valve internals shall be able to avoid jamming, occlusion and scratching caused by frequent operation in liquid hydrogen environment, and their corrosion resistance shall not be inferior to that of the body pressure-bearing component.
4.2.4 The material used to manufacture bellows should be S31608 or S31603.
4.2.5 Austenitic stainless steel shall be used as metallic material for pressure-bearing components of valves, which shall be subjected to solid solution treatment. The metallographic structure of the material shall be stable, and the chemical composition analysis and mechanical properties of the material at room temperature shall meet the requirements of standards for corresponding materials.
4.2.6 The nickel content of austenitic stainless steel in contact with hydrogen medium shall not be less than 10%. The ferrite measurement value of forgings, pipes and bars shall not be greater than 3%, and the ferrite measurement value of castings shall not be greater than 8%. Recommended materials for the main parts of the valve are shown in Annex B.
4.2.7 The low temperature impact performance index of the metal materials used in the pressure-bearing parts shall not be lower than that specified in Table 1.
Contents Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Technical requirements 4.1 Basic requirements 4.2 Materials 4.3 Structural design 4.4 Normal temperature performance 4.5 Low temperature performance 5 Test methods 5.1 Test conditions 5.2 Materials 5.3 Structural design 5.4 Degreasing inspection 5.5 Normal temperature performance 5.6 Low temperature performance 5.7 Marking inspection 6 Inspection rules 6.1 Delivery inspection 6.2 Type testing 7 Marking 7.1 General 7.2 Markings on body 7.3 Markings on nameplate 7.4 Other markings 8 Packaging, storage and transportation Annex A (Normative) Welding requirements Annex B (Informative) Recommended designations of metal materials for main parts of valves Annex C (Informative) Recommended minimum length of body extension Annex D (Informative) Leakage rate coefficient of pneumatic control valve Annex E (Informative) Corresponding relationship between temperature and pressure of liquid hydrogen Bibliography
