First, the inspection before use
Before filling the liquid nitrogen tank with liquid nitrogen, it is necessary to check whether the shell is sunken and whether the vacuum exhaust port is intact. If it is damaged, the vacuum degree will be reduced, and in severe cases, the intake air cannot be kept warm, which will frost the upper part of the tank, resulting in a large loss of liquid nitrogen and loss of the value of continuous use. Second, check the inside of the water tank. If there are foreign objects, be sure to take them out to prevent the liner from being corroded.
Second, the filling of liquid nitrogen
Be careful when filling liquid nitrogen. For new or dry cans, it is necessary to slowly fill and precool, so as to prevent the liner from being damaged by too fast cooling and reduce the service life. When filling liquid nitrogen, don't pour liquid nitrogen on the vacuum vent to avoid reducing the vacuum degree. The cover plug is made of heat insulation material, which can not only prevent the evaporation of liquid nitrogen, but also fix the lifting cylinder, so the wear should be minimized when opening and closing to prolong the service life.
Three, the storage of liquid nitrogen in liquid nitrogen tank:
When storing liquid medium in a liquid nitrogen tank, be sure to close the inlet and outlet valves and the booster valve, and open the exhaust valve.
Four, the transportation of liquid nitrogen in liquid nitrogen tank:
When transporting liquid nitrogen medium by liquid nitrogen tank, make sure that the on-off state of each valve is the same as that during storage, and please put the bottom of the packing box under the container seat ring, and fix the liquid nitrogen tank container on the car reliably with a rope, so that the liquid nitrogen tank will not shake during transportation.
Verb (abbreviation for verb) Injection of liquid nitrogen into a liquid nitrogen tank:
If you want to export liquid nitrogen from the liquid nitrogen tank, please follow the following procedure:
Close the exhaust valve; Open the booster valve; Observe the pressure gauge; When the pressure rises to 0.05MPa(0.5kg/cm2), open the drain valve and continue infusion.
Six, check in the process of use
Check it frequently during use. You can observe with your eyes or touch the shell with your hands. If frost is found on the surface, stop using it. Especially when the inner wall of the neck tube is frosted and frozen, it is not advisable to scrape it with a knife to avoid damaging the inner wall of the neck tube and causing poor vacuum. But to take out the liquid nitrogen and let it melt naturally.