1 Scope
This standard specifies the terms and definitions, structural forms and length, technical requirements, inspection methods, inspection rules as well as marking, protection, packaging, transportation and storage of the spring loaded safety valve for cryogenic service.
This standard is applicable to the safety valves for cryogenic gas medium, with a nominal pressure of PN6 ~ PN100, a nominal dimension of DN15~DN200, a temperature of not less than -196℃ and a minimum set pressure of 0.1 MPa.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature (GB/T 228.1-2010, ISO 6892-1: 2009, MOD)
GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1: 2006, MOD)
GB/T 12225 General purpose industrial valves - Specification of copper alloy castings
GB/T 12230 General purpose industrial valve - Specification of stainless steel castings
GB/T 12241 Safety valves - General requirements (GB/T 12241-2005, ISO 4126-1: 1991, MOD)
GB/T 12242 Performance test code - Pressure relief devices (GB/T 12242-2005, ASME PTC 25: 1994, MOD)
GB/T 12243 Spring loaded safety valves (GB/T 12243-2005, JIS B 8210: 1994, MOD)
JB/T 2203 Structural length of spring type safety valve
JB/T 6438 Technical requirements for plasma arc overlaying welding for valve sealing surface
JB/T 7248 Technical specification for low temperature service steel casting for valves
JB/T 7927 Valve cast steel visual quality requirements
3 Terms and definitions
For the purpose of this document, the terms and definitions established in GB/T 12241 apply.
4 Structural forms and length
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Structural forms and length
5 Technical requirements
6 Inspection methods
7 Inspection rules
8 Marking, protection, packaging, transportation and storage
Figure 1 Typical structural forms of the safety valve for cryogenic service
Figure 2 Test system for cryogenic safety valve
Table 1 Leakage rate of the low-temperature seal test for the spring loaded safety valve for cryogenic service
Table 2 Inspection items, technical requirements and inspection methods
