The standards for vacuum test of cryogenic tanks are mainly based on the national standard GB18442 and the pressure vessel inspection regulations TSG R7001. The specific standards are as follows:
When not filled with cryogenic medium, the vacuum degree should be lower than 65Pa.
When filled with cryogenic medium, the vacuum degree should be lower than 10Pa.
Under certain specific conditions of use, such as after the vacuum powder cryogenic insulation container is filled with cryogenic liquid, the pressure standard of the vacuum interlayer may be more stringent, for example, not higher than 0.5Pa.