Before filling liquid nitrogen, the liquid nitrogen tank must first check whether the housing has a depression and whether the vacuum exhaust port is in good condition. If it is damaged, the degree of vacuum will be reduced. In severe cases, the intake air cannot be kept warm, so that the upper part of the tank will be frosted and the loss of liquid nitrogen will be large, thus losing the value of continued use. Second, check the inside of the tank. If there is any foreign matter, it must be removed to prevent the tank from being corroded.
Second, the filling of liquid nitrogen
Be careful when filling liquid nitrogen. For new tanks or tanks that are in a dry state, they must be filled slowly and pre-cooled to prevent the cooling from damaging the tanks too quickly and reducing the service life. When filling liquid nitrogen, do not pour liquid nitrogen on the vacuum exhaust port to avoid a drop in vacuum. The cover is made of heat-insulating material, which can prevent liquid nitrogen from evaporating and can also act as a fixed lifting tube. Therefore, wear and tear should be minimized during the switch to extend the service life.
Third, the use of inspection
Always check the liquid nitrogen tank during use. You can use the eye to look at or touch the shell by hand. If it is found that the appearance of hanging cream, you should stop using it; especially when the frost on the inner wall of the neck tube is not suitable to use a knife to scratch, to prevent the inner wall of the neck tube from being damaged, resulting in a bad vacuum. The liquid nitrogen should be taken out and allowed to melt naturally.
Fourth, the placement of liquid nitrogen tank
Liquid nitrogen tanks should be stored in a cool, well-ventilated place. Do not expose to direct sunlight. Due to its precision of manufacture and its inherent characteristics, liquid nitrogen tanks are not allowed to tilt, cross, invert, stack, collide with each other or collide with other objects during use or storage. upright.
Fifth, liquid nitrogen tank cleaning
When the liquid nitrogen tank is not in use, it should be rinsed with clean water, drained, blown dry with a blower, and left to stand at room temperature. After the liquid nitrogen in the liquid nitrogen tank evaporates, the remaining missing material (such as frozen sperm) quickly melts into a liquid substance and adheres to the inner gallon, causing corrosion of the aluminum alloy inner shell. If a hollow cavity is formed, the liquid The nitrogen tank will be scrapped, so it is very necessary to scrub the tank after the liquid nitrogen in the liquid nitrogen tank is depleted. The specific brushing method is as follows: First, remove the liquid nitrogen container, remove the liquid nitrogen, and place it for 2-3 days until the temperature in the tank rises to about 0°C. Then, pour about 30°C warm water and scrub it with a cloth. If you find that individual melting substances stick to the bottom of the gallbladder, be sure to wash it carefully. And then rinse with water several times, then invert the liquid nitrogen tank, place it in a safe place, not to fall over, air dry naturally, or use a blower to air dry as described above. Note that during the entire brushing process, the movement should be slow, the temperature of the poured water must not exceed 40°C, and the total weight should not exceed 2kg.
Sixth, the safe transportation of liquid nitrogen tank
The liquid nitrogen tank must be installed in the wooden frame to be cushioned and fixed during transportation. The tanks should be separated from the tanks with a filler to prevent bumps and prevent dumping. When loading and unloading trucks, the liquid nitrogen tanks should be strictly prevented from colliding, and they must not be dragged on the ground to avoid reducing the service life of liquid nitrogen tanks.
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