Why should LNG Dewar be pumped to vacuum regularly

With the development of liquid natural gas, various LNG dewars are more and more frequently used in the development of modern industry, then we will see that some staff regularly pump cryogenic gas cylinders into a vacuum state.
 
Due to the slow deflation of the container material and the leakage rate of the vacuum interlayer seal, the LNG Dewar will lose its insulation  performance after a certain period of time due to the lack of vacuum in the interlayer, and the liquid inside the cryogenic gas cylinder after the insulation performance decreases After absorbing heat, it vaporizes, causing the pressure of the inner bladder to increase, and then frequently deflates through the safety valve, and the stored liquid will quickly decrease when not in use, causing unnecessary economic losses. Once the cryogenic gas cylinder has poor thermal insulation performance, the safety valve exhaust gas will frequently increase by a geometric multiple. Therefore, when the vacuum of the cryogenic gas cylinder is missing, a professional vacuum pump set must be used to supplement the vacuum degree of the cryogenic gas cylinder interlayer. Once the vacuum degree is restored to the factory value, the insulation performance of the cryogenic gas cylinder can be significantly improved.
 
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