Liquid nitrogen Dewar tanks in cryogenic containers are favored by research laboratories and livestock freezing users because of the convenience of storing biological samples and the large selection of models.
Due to the preciousness of the stored samples, users are mostly concerned about the safety of their use.
This question is still relatively speaking!
The premise that there is no danger is to operate properly and follow the product instructions.
Most of the dangerous ones are due to improper operation. For example, in order to avoid the volatilization of liquid nitrogen, the liquid nitrogen storage Dewar tank is sealed, so that the naturally volatilized nitrogen cannot be discharged, causing the tank to explode; or to take samples in liquid nitrogen with bare hands, which is harmful. Frostbite yourself and so on.
The liquid nitrogen storage Dewar is an open normal temperature tank, no pressure, and no pressure will be generated.
After the liquid nitrogen is installed, because the liquid nitrogen will naturally volatilize, and the gas is under pressure, it will accumulate and cannot be discharged, and it will explode when it reaches a critical value.
In order to avoid this danger, the liquid nitrogen storage Dewar neck plugs are designed to be loose so that the nitrogen can be discharged.
However, some users try to seal the jar because they want the liquid nitrogen to be kept forever. The result is often an explosion and the jar is damaged; if they are lucky, no one is hurt, only the sample is destroyed;
However, some users try to seal the container because they want the liquid nitrogen to be kept forever. The result is often an explosion and the tank is damaged; if they are lucky, no one is hurt, only the sample is destroyed; if they are unlucky, the sample is destroyed and injured.
Therefore, if you want liquid nitrogen storage dewar to be safe, you must strictly follow the instructions for use, do not seal the jar, replace the neck plug at will, and pay attention to personal protection when using it.