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Why is the liquid nitrogen container neck plug not sealed?

Edit: Henan Tianchi Instrument Equipment Co., Ltd    Date:2019-05-27
The neck plug of the liquid nitrogen container is used to block the neck of the container to reduce the evaporation of liquid nitrogen and to preserve the liquid nitrogen. There are a plurality of different grooves on the neck plug (containers with different volumes and different calibers, corresponding to different numbers of slots), which are used to fix the lifting basket/lifting basket.
But why is the liquid nitrogen container neck plug not sealed?
Answer: The neck stopper of liquid nitrogen container can not be deliberately sealed. It can not be replaced by other items. Only the neck plug of the factory can be used to close the tank mouth. Otherwise, the internal pressure will increase and the container will be damaged. In serious cases, accidents may occur.
Therefore, the neck stopper of the liquid nitrogen tank can not only be sealed, but should be ventilated in the place where the liquid nitrogen tank is kept and operated to avoid the occurrence of oxygen deficiency.
Why is the liquid nitrogen container neck plug not sealed