When the liquid nitrogen tank is not in use, rinse it with clean water, drain the water, dry it with a blower, and place it at room temperature for use. After the liquid nitrogen in the liquid nitrogen tank is volatilized, the remaining missing substances (such as frozen sperm) will melt quickly and become liquid substances attached to the inner tank, which will cause corrosion to the inner tank of the aluminum alloy. The nitrogen tank must be scrapped, so it is necessary to brush the tank after the liquid nitrogen in the liquid nitrogen tank is exhausted. The specific brushing method is as follows: first, take out the lifting cylinder in the liquid nitrogen tank, remove the liquid nitrogen, and leave it for 2-3 days. When the temperature in the tank rises to about 0 °C, pour warm water at about 30 °C, and scrub with a cloth. If you find that individual melted substances stick to the bottom of the inner tank, be sure to wash it carefully. Then rinse it with clean water several times, then invert the liquid nitrogen tank, put it in a safe place indoors that should not be overturned, and air dry it naturally, or air dry it with a blower as described above. Note that during the entire brushing process, the action should be light and slow, the temperature of the poured water should not exceed 40°C, and the total weight should not exceed 2kg.

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