With the development in recent years, the application range of liquid nitrogen has become more and more extensive. Therefore, the use of liquid nitrogen tanks is increasing, and the manufacturers of liquid nitrogen tanks have also become many. The liquid nitrogen tank is made of aluminum alloy and stainless steel. There are some problems that need special attention when using it. The following will describe in detail the problems that need to be paid attention to when using the liquid nitrogen tank.

1. If the liquid nitrogen tank is replenished with liquid nitrogen indoors, be sure to open the doors and windows to operate to prevent severe oxygen deficiency in the operating environment. The new liquid nitrogen tank or the liquid nitrogen tank that has been thawed and rewarmed must be filled with a small amount of liquid nitrogen to be pre-cooled before use, and then filled with liquid nitrogen after being subjected to near heat balance.

2. When filling the liquid nitrogen, use a pump or a long tube funnel. The filling tube should be inserted close to the bottom of the liquid nitrogen tank, and a gap should be left in the middle of the liquid nitrogen tank to allow nitrogen to drain. The liquid level in the liquid nitrogen tank should not exceed the plane of the lower end of the neck tube. Avoid contact with liquid nitrogen in the operation to avoid frostbite.

3. 2-3 hours after the initial introduction of the frozen product in the liquid nitrogen tank, it is necessary for the special operator to regularly observe whether there is condensation or frost on the outer surface of the liquid nitrogen tank. If these two conditions occur, the liquid nitrogen is indicated. The vacuum degree of the tank has deteriorated, which will cause the liquid nitrogen in the liquid nitrogen tank to be volatilized in a short period of time, and the liquid nitrogen tank cannot be used normally. The probability of occurrence of this phenomenon is relatively small, possibly due to failure to meet product requirements. This is caused by loading and unloading and transportation, but this observation is necessary to avoid the loss of frozen goods.

4. The liquid nitrogen tank shell has been subjected to the atmospheric pressure of the use and transportation environment. If a serious collision or heavy pressure occurs during use or transportation, the surface of the liquid nitrogen tank casing will be sunken, resulting in damage or failure of the product. Liquid nitrogen tanks are designed for liquid nitrogen storage and transportation. Liquid oxygen is strictly prohibited.

5. The inner tank of the liquid nitrogen tank is in normal working condition. It is not allowed to use the method of pneumatic pressure or sealing liquid nitrogen tank. The neck tube is the passage for liquid nitrogen and frozen articles. Do not scratch the tube when using. wall.

6. Liquid nitrogen tank vacuum sealing joint is a key component to maintain the vacuum of the liquid nitrogen tank interlayer. Once damaged, it will immediately cause the vacuum of the liquid nitrogen tank interlayer to deteriorate, and the product can not be used continuously. Therefore, the liquid nitrogen tank vacuum sealing joint should not be opened without authorization.

7. The storage type liquid nitrogen tank cannot be used for vehicle transportation when it is filled with liquid nitrogen or frozen articles. If the liquid nitrogen tank is filled with liquid nitrogen, if there is a large amount of condensation on the surface of the liquid nitrogen tank, Abnormal phenomena such as water and frost should be repaired immediately.