Liquid nitrogen tank cleaning and maintenance knowledge

Liquid nitrogen tank is mainly used to store liquid nitrogen, convenient for liquid nitrogen transportation. Now more and more industries using liquid nitrogen tanks, such as metal materials refrigeration, medical treatment, etc., then this article will tell about Some basic knowledge of liquid nitrogen tanks.

First, the use of liquid nitrogen tank knowledge

1. Preparation before use of liquid nitrogen tank: A small amount of liquid nitrogen should be injected to pre-cool it. When the temperature in the tank reaches the liquid nitrogen temperature, liquid nitrogen is filled until it is full. The liquid nitrogen tank should be lightly handled to prevent collision and squeezing. When moving, do not drag on the ground and lift it.

2. Placement of liquid nitrogen tank: Liquid nitrogen tank should be stored in a well-ventilated shade, not exposed to direct sunlight. Due to its precision of manufacture and its inherent characteristics, liquid nitrogen tanks are not allowed to be tilted, horizontally placed, inverted, stacked, collided with each other or collided with other objects, whether they are used or stored, to be handled lightly and always upright.

Second, the cleaning method of liquid nitrogen tank

1. When the liquid nitrogen tank is not in use, rinse it with clean water, drain the water, blow it dry with a blower, and place it at room temperature for use.

2. The specific brushing method is as follows: first remove the liquid nitrogen tank, remove the liquid nitrogen, and place it for 2~3 days. When the temperature inside the tank rises to about 0 °C, pour the warm water around 30 °C and scrub with a cloth. . If you find that the individual melted substances are stuck on the bottom of the inner liner, be careful to wash them carefully. Then rinse with water several times, then invert the liquid nitrogen tank, put it indoors safely and should not fall over, dry naturally, or air dry with a blower as described above. Note that during the entire brushing process, the action should be slow, the temperature of the inverted water should not exceed 40 °C, and the total weight should not exceed 2 kg.

3. Whether the liquid nitrogen tank is used for the first time is cleaned

1. The liquid nitrogen tank can be used for the first time without cleaning. If there is any residual liquid nitrogen left in the factory, it can be cleaned. If it is other items, it needs to be cleaned. Refer to the above for cleaning methods.

Fourth, the use and maintenance of liquid nitrogen tank

1. Before filling the liquid nitrogen tank, first check whether the outer casing has any depression or not, and whether the vacuum exhaust port is intact; if it is damaged, the vacuum degree will be lowered, and the intake air will not be insulated, so the upper part of the tank will be Frosting, large loss of liquid nitrogen, will lose the value of continued use.

2. For new tanks or tanks that are in a dry state, they must be slowly filled and pre-cooled to prevent the liner from being damaged too quickly, reducing the service life. Do not pour liquid nitrogen on the vacuum vent when filling liquid nitrogen to avoid a drop in vacuum. The stopper is made of heat-insulating material, which can prevent liquid nitrogen from evaporating and can also act as a fixed lifting cylinder, so the wear should be minimized during the switch to prolong the service life.

3. During the use process, the use of the tank should be checked every day. It is found that there are water drops and frost on the upper or upper part of the tank cap, indicating that there is a problem with the quality of the tank, and should be stopped immediately; When water drops or frosting, you can touch the outer shell by hand. If the upper part is cold and the lower part is hot, this also indicates that there is a certain problem in the quality of the tank, that is, the daily increase of liquid nitrogen is large. It should be observed to prevent liquid nitrogen loss. It is best to stop using it.

5. After filling the liquid nitrogen tank with liquid nitrogen, weigh the liquid nitrogen tank in time for 5-7 days to understand the liquid nitrogen loss. If the loss of liquid nitrogen is found to be abnormal, it is due to the abnormal performance of the liquid nitrogen tank, and the items preserved in the liquid nitrogen tank must be quickly exchanged into other liquid nitrogen tanks. In general, if there is sweat around the neck of a liquid nitrogen tank, or when it is found to be accompanied by hoarfrost, it is abnormal.

6. When putting in or taking out frozen items, try to make the opening time of the tank mouth as short as possible to reduce the consumption of liquid nitrogen, and do not put the lifting rod completely. It is strictly forbidden to place objects on the container lid and seal the neck. It is strictly forbidden to remove the frost in the neck tube with a hard object to avoid damage to the neck tube.

7. The liquid nitrogen tank is only used to hold liquid nitrogen, and it is not allowed to contain other liquids or mixed.

8. Liquid nitrogen tank During the transportation process, the liquid nitrogen tank should be fixed with sponge or other items, and the cover should be fixed with tape to prevent damage due to collision and reverse, affecting the liquid nitrogen tank. Years of use.