LEAK TESTING METHOD OF HELIUM MASS SPECTROMETER FOR INSULATED CRYOGENIC VESSEL DISCUSSION

Leakage is one of main technical parameters of insulated cryogenic vessel. Using leak testing technology of helium mass spectrometer to locate and test can be used to control the quality of the products. At first,two leak testing systems of helium mass spectrometer for insulated cryogenic vessel were compared and analyzed. In the same testing condition,if the position of the reference leak is different in the system,it will have an influence on the minimum detectable leakage rate、response time and leakage rate calculated value. Based on the analysis of the influence,the article puts forward some suggestions on the leak testing work. Secondly,the selection principle of shunt leak testing method and no shunt leak testing method were discussed. The leak testing method of the fillet weld、butt weld、jacket leak、valve and the entire tank for 53 m₃ LNG storage container were described. Attentions in the leak testing process were provided at last.