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Liquid nitrogen tank maintenance method

Technical Knowledge 2019-08-16 20:07:20
Liquid nitrogen tanks are mainly used to store liquid nitrogen, which is convenient for the transportation of liquid nitrogen. Now there are more and more industries using liquid nitrogen tanks, such as metal materials refrigeration and medical treatment.

The use and maintenance of liquid nitrogen tanks are very strict. The use and maintenance of liquid nitrogen tanks are as follows:

1. check before use

Before filling the liquid nitrogen tank, the liquid nitrogen tank should first 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. Next, check the inside of the tank. If there is any foreign matter, it must be taken out to prevent the inner tank from being corroded.

2. the filling of liquid nitrogen

Be careful when filling liquid nitrogen. 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 and 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 the liquid nitrogen from evaporating and also functions as a fixed lifting cylinder, so the wear should be minimized during the switch to prolong the service life.

3. should be checked during use

Always check during use. You can use the eye to observe or touch the shell with your hand. If you find that the surface is frosted, you should stop using it; especially when the inner wall of the neck tube is frosted and icing, it is not advisable to use a knife to scrape it to prevent the inner wall of the neck tube from being damaged, resulting in poor vacuum. The liquid nitrogen should be taken out and allowed to melt naturally.

4. the placement of liquid nitrogen tank

Store liquid nitrogen tanks in a well-ventilated, cool place, and do not expose to direct sunlight. Due to its precision of manufacture and its inherent characteristics, liquid nitrogen tanks are not allowed to be tilted, placed horizontally, inverted, stacked, collided with each other or collided with other objects, whether they are used or stored. upright.

5. Safe transportation of liquid nitrogen tanks

The liquid nitrogen tank must be placed in a wooden frame and padded during transportation and fixed. The tank and the tank should be separated by a filler to prevent bumps and impacts and prevent dumping. When loading and unloading the vehicle, it is necessary to prevent the liquid nitrogen tank from hitting, and it is not allowed to be dragged on the ground at will, so as not to reduce the service life of the liquid nitrogen tank.

6. the cleaning of liquid nitrogen tank

When the nitrogen tank of the liquid nitrogen tank is not used, it should be rinsed with clean water, drained, blown dry with a blower, and placed at room temperature for use. After the liquid nitrogen in the liquid nitrogen tank is volatilized, the remaining missing substances (such as frozen sperm) melt quickly and become liquid substances attached to the inner liner, causing corrosion to the inner liner of the aluminum alloy. If a cavity is formed, the liquid is formed. The nitrogen tank will be scrapped, so it is necessary to scrub the tank after the liquid nitrogen in the liquid nitrogen tank is exhausted. 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 of about 30 °C and scrub with a cloth. If you find that the individual melted substances stick to the bottom of the inner liner, be sure to wash them carefully. Then rinse with water several times, then invert the liquid nitrogen tank, place it indoors safely and not overturn, 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.

Tags liquid nitrogen tank liquid nitrogen canister dewar liquid nitrogen storage
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