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What is the reason for frost on the outside of Ln2 storage tank?

2024-05-15 10:45:41

As a liquid nitrogen storage container, the ln2 liquid nitrogen storage tank can provide a vacuum + thermal insulation structure, that is, a vacuum is drawn between the inner and outer tanks, and insulating and adsorbent materials are filled between the inner and outer tanks to insulate the interior and isolate external heat. Purpose.

Therefore, the outer wall of a normal ln2 storage tank is made of normal materials + room temperature, not as low as liquid nitrogen. Once the outer wall of the container feels cold to the touch, below 0°C, you can initially judge that there is an abnormality in the vacuum! There is another phenomenon – frosting, which may also be caused by insufficient vacuum, but it requires specific analysis based on specific use, because not all frosting is due to vacuum abnormalities!

Today, KGSQ is here to talk to you about what causes frost on the outside of ln2 storage tanks?

Why?

There are two situations that need to be analyzed!

The first type, the new ln2 container is injected with liquid nitrogen for the first time and frosted

The new ln2 container is an empty storage tank issued by the manufacturer and received by the user. Liquid nitrogen needs to be injected before use.

Since the tank itself is at room temperature, a sudden injection of -196°C liquid nitrogen, the exchange of cold and heat, and the addition of water molecules in the air will cause a layer of white frost to form on the outside of the container. The frost will gradually fade after a few hours, at which time the sample can be placed for storage.

Therefore, if this is the case with frost, it is normal! But there are exceptions. For example, if the frost does not fade after waiting for a few hours, and the frost becomes thicker and thicker, it can be determined that there is a problem with the quality of the ln2 storage tank.

Second, the ln2 storage tank that has been in use suddenly freezes on the outside.

A liquid nitrogen container that is in normal use suddenly freezes before it reaches its end of life. Don’t worry, this is a problem with the vacuum!

The container has been running smoothly, and the samples have not been damaged. However, one day frost suddenly occurs, which is a vacuum failure, causing the temperature of the liquid nitrogen in the inner tank to be transferred to the outer wall, and forms white frost when it comes into contact with moisture in the air. Manufacturers and suppliers can be found to assist.

These are the reasons for the frost on the outside of the ln2 storage tank. They are not all vacuum abnormalities. They need to be analyzed in detail!

What is the reason for frost on the outside of Ln2 storage tank