For the liquid nitrogen tank, when the liquid nitrogen is filled, the evaporation takes 48 hours to return to the steady state, and the time required for the fine liquid nitrogen tank to return to the steady state can be reduced to 12 hours, and the evaporation loss can be eliminated by 50%. We understand the characteristics of liquid nitrogen and the brief structure of the liquid nitrogen tank, so that it can be used accurately and its performance can be fully developed. The main points of use are summarized below:

First, there should be a special person responsible for management, use and maintenance. If multiple liquid nitrogen tanks are stored in a closed room, the evaporated nitrogen will remain in the room, resulting in a state of hypoxia, which is likely to produce asphyxiation chaos. Control liquid nitrogen tank to gently handle to prevent collision with other objects, due to the liquid nitrogen tank through the exhaust and become a high vacuum state, the pressure of the surface tank by the atmosphere is proportionately large, to dr 10 and dr 30 as an example, the pressure of the outer tank, about 4. o kg to 9... o kg, although it is made to play three times the strength of its own weight, the operation should also be very detailed, and the cut cannot be lost or collided. Tianchi liquid nitrogen tank skills staff remind the liquid nitrogen tank to connect vertically, it is strictly prohibited to dump the liquid nitrogen in the tank to avoid accidents.

Second, when the first filling liquid nitrogen, or the liquid nitrogen tank is in a dry state, it is necessary to check the outside of the tank to see whether there is a depression or other extraordinary environment. There is no foreign matter in the tank, and whether the base is firmly fixed. If these environments are good, filling with liquid nitrogen can be started, and it should be held in a well-ventilated location, which can usually be held outdoors. If held indoors, doors and Windows must be opened to connect the good ventilation state. One is pressure injection method, which is to open the liquid valve of a large liquid nitrogen container and connect a flexible hose to fill the liquid nitrogen tank directly. The other is the direct funnel pouring method, which should be especially careful to make the end of the funnel slightly out of the neck tube, so that the gas of liquid nitrogen evaporation can escape smoothly from the gap between the funnel and the container, otherwise the liquid will overflow from the funnel, which will not only increase the loss of liquid nitrogen, but also produce frostbite chaos. The rate of filling liquid nitrogen should be slow, first inject a small amount, then stop for a few minutes, let it cool and then gradually fill to the specified capacity.