Why should cryogenic cylinders be evacuated at regular intervals?

 With the development of liquefied natural gas, in the development of modern industry more and more frequent use of various cryogenic cylinders, then we will see some of the staff regularly pumped into the vacuum cryogenic cylinders, this is why?

The leakage rate of the container material deflation and a vacuum interlayer sealing mouth, cryogenic cylinders will decline due to the insulation performance of vacuum interlayer inside degree loss in use after a certain time, low temperature heat absorption liquid cylinder internal insulation performance decreased after gasification, resulting in increased inner pressure, then the safety valve through frequent gas storage liquid will also decrease rapidly in the case of non use, causing unnecessary economic losses.

Once the cryogenic cylinder has poor thermal insulation performance, the exhaust gas of the safety valve will increase exponentially. So in the absence of low temperature vacuum cylinder under the condition of vacuum pump must be used on the low temperature gas cylinder sandwich fill vacuum, vacuum once restored to factory value, improve the insulation performance of low temperature gas cylinders can be obvious.