Self-pressurized liquid nitrogen tanks are often used as filling tanks for other containers. It makes filling a large amount of liquid nitrogen simple and efficient, but some problems also puzzle users. For example: Why does the self-pressurized liquid nitrogen tank freeze? Obviously, it is different from the ordinary liquid nitrogen tank in terms of material and structure, and there will be frosting problems in everything.

Well, there are three reasons!

1. Structural problems, normal phenomenon

The pressurized coil of the self-pressurized liquid nitrogen tank is connected to the outer bladder. During the working process, the liquid ammonia in the coil will exchange heat with the outer bladder, so the outer wall will be frosted, which is normal.

2. The container is leaking, stop using it

If your self-pressurized liquid nitrogen tank has been kept at rest without pressurization, but the outer wall has a lot of frost, it can be determined that the tank is leaking.

Solution: Stop using it immediately and open the empty valve;

3. Frost on the neck, depending on the situation

It is also a problem with the structure of the self-pressurized liquid nitrogen tank. The inner tank and the outer tank are connected near the neck. It is normal for a small amount of frost to form during work, but if the frosted area is relatively large, it is necessary to stop using it for maintenance.

If you encounter the problem of frosting of the self-pressurized liquid nitrogen tank at work, don’t panic, first determine the cause, and see if further treatment is needed according to the cause.