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Dewar vessel inspection precautions

Edit: Henan Tianchi Instrument Equipment Co., Ltd    Date:2019-05-06
The inspection of common problems of dewar vessel mainly includes the outer casing of the container, as well as the inspection of various factors such as the inside of the tank, the degree of vacuum and the amount of volatilization.
1. We need to check whether the outer casing is recessed or not, and whether the vacuum exhaust port is intact. If it is damaged, the degree of vacuum will decrease. In severe cases, the intake air will not be insulated, so that the upper part of the tank will be frosted, the liquid nitrogen loss will be large, and the value of continued use will be lost. Also, we have to inspect the inside of the tank. If there is any foreign matter, it must be taken out to prevent the inner tank from being corroded.
Dewar vessel inspection precautions
2. When we use Dewar, we need to check it. We can use the eye to observe or touch the shell by hand. If the surface is found to be frosted, it should be stopped. Especially when the inner wall of the neck tube is frosted and frozen. Use a knife to scrape to prevent damage to the inner wall of the neck tube, resulting in poor vacuum. Instead, the liquid nitrogen should be removed to allow it to naturally melt.
3. For new tanks or tanks that are in a dry state, we must slowly fill and pre-cool, in order to prevent the temperature from falling too quickly to damage the liner and reduce the service life. Do not pour liquid nitrogen on the vacuum vent when filling liquid nitrogen to avoid a drop in vacuum.
Dewar vessel inspection precautions