What should be paid attention to when replenishing liquid nitrogen to liquid nitrogen tank for the first time
Editor:adminClick：
Time:2019-10-28 09:23
When replenishing liquid nitrogen to the liquid nitrogen tank for the first time, the inner part of the liquid nitrogen tank shall be kept dry, and the liquid nitrogen tank shall be inspected to see whether the outer part of the liquid nitrogen tank is uneven, or other special circumstances. There are no other items in the liquid nitrogen tank, and whether the base of the liquid nitrogen tank is fixed firmly.
When there is no problem in the above situations, liquid nitrogen can be replenished. It is recommended to replenish liquid nitrogen in a well ventilated place. Generally, it is operated outdoors.
If it is necessary to operate indoors (due to special circumstances such as floors and weather), it is necessary to open the doors and windows to ensure good ventilation in the room.
Liquid nitrogen filling belongs to pressure injection method, which refers to filling small liquid nitrogen tank directly by connecting hose from large liquid nitrogen tank. It is necessary to open the liquid valve from the large liquid nitrogen tank container and connect the flexible hose.
Another method is funnel pouring, which requires special attention to make the end of the funnel slightly leave the neck of the liquid nitrogen tank, so that the gas evaporated by liquid nitrogen can not be discharged smoothly from the gap between the funnel and the liquid nitrogen tank. Otherwise, the liquid will overflow from the funnel, which will not only increase the loss of liquid nitrogen, but also cause frostbite accidents.
Another point needs our operator's attention. When filling liquid nitrogen, the speed should be slow. First, fill with a small amount of liquid nitrogen, and then stop for a few minutes to cool down and then gradually fill up to the required and specified capacity.
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