This part of GB/T 18442 specifies the test methods and inspection rules for static vacuum insulated cryogenic pressure vessels (hereinafter referred to as "cryogenic vessels") during the fabricating process and after completion.
This part is applicable to cryogenic vessels that simultaneously meet the following conditions:
a) cryogenic vessel with the working pressure of inner vessel is not less than 0.1 MPa;
b) cryogenic vessel with the geometric volume is not less than 1 m3;
c) cryogenic vessel with the insulation mode of vacuum powder insulation, vacuum composite insulation or high vacuum multilayer insulation;
d) cryogenic vessel storing refrigerated liquefied gas content with standard boiling point not lower than -196 ℃;
This standard is not applicable to the following cryogenic vessels:
a) cryogenic vessel with inner vessel and outer jacket made of non-ferrous metal or non-metal materials
b) cryogenic vessel with spherical structure;
c) cryogenic vessel with stacked insulation;
d) transportable cryogenic vessel;
e) cryogenic vessel storing refrigerated liquefied gas content with standard boiling point lower than -196 ℃;
d) cryogenic vessel storing toxic gas as specified in GB 12268;
g) cryogenic vessel with special requirements such as national defense military equipment.
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 referenced document (including any amendments) applies.
GB/T 150 (All parts) Pressure vessels
GB/T 18442.1 Static vacuum insulated cryogenic pressure vessels - Part 1: General requirements
GB/T 18442.2-2019 Static vacuum insulated cryogenic pressure vessels - Part 2: Materials
GB/T 18442.3-2019 Static vacuum insulated cryogenic pressure vessels - Part 3: Design
GB/T 18442.4-2019 Static vacuum insulated cryogenic pressure vessels - Part 4: Fabrication
GB/T 18442.6-2019 Static vacuum insulated cryogenic pressure vessels - Part 6: Safety protection
GB/T 18443.2 Testing method of performance for vacuum insulation cryogenic equipment - Part 2: Vacuum degree measurement
GB/T 18443.3 Testing method of performance for vacuum insulation cryogenic equipment - Part 3: Leak rate measurement
GB/T 18443.4 Testing method of performance for vacuum insulation cryogenic equipment - Part 4: Vacuum degree measurement
GB/T 18443.5 Testing method of performance for vacuum insulation cryogenic equipment - Part 5: Static evaporation rate measurement
GB/T 18443.7 Testing method of performance for vacuum insulation cryogenic equipment - Part 7: Holding time measurement
GB/T 18443.8 Testing method of performance for vacuum insulation cryogenic equipment - Part 8: Volume measurement
GB/T 20801.5 Pressure piping code - Industrial piping - Part 5: Inspection and testing
JB/T 6896 Surface cleanliness of air separation plants
TSG 21 Supervision regulation on safety technology for stationary pressure vessel
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 150, GB/T 18442.1, GB/T 18442.3 and GB/T 18442.4, as well as the following apply.
3.1
cold shock test
fill the inner vessel with refrigerated liquefied gas at a set speed to cool the inner vessel to a predetermined temperature within a specified time, so as to investigate the ability of the inner vessel to withstand the speed and amplitude of temperature difference stress change
GB/T 18442.5-2019 The following standards are cited：
