Before filling the liquid nitrogen, must check the liquid nitrogen container’s shell and vacuum whether is dented and the in good condition.If it is damaged, the vacuum will be reduced,and the air intake will not be kept cryogenic when serious,so that the tank will be frosted and the value of using will be lost.
Second,check the inside of the tank. If there is any foreign things,it must be taken out to prevent the bladder from being corroded.
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