1.1 years beyond normal use
Foreign manufacturers say that the design life of container design is generally 5 years: domestic manufacturers do not have a forecast of years of use. This is to say that making containers
The durability of raw materials generally has lost the inherent properties of raw materials to 5 years. Therefore, after 5 years of use, the liquid nitrogen tank has poor cooling performance, which is a problem that exceeds the normal service life. of course. After the normal service life, if there is no abnormality, it is still necessary to continue to use. However, special attention should be paid to the technical inspection of the cold storage performance of liquid nitrogen containers to avoid problems and accidents.
1.2 affects the life of the container
Containers should be discarded beyond normal service life and generally have no maintenance value. So why do some containers use less than 5 years, or even a year and a half?
Is it forced to abandon? There are two main factors influencing the quality of the manufacturing.
1.2.1 Internal groove corrosion
The raw materials for the containers are made of aluminum, and some are made of stainless steel. At the same time, the surface treatment is carried out, so the weight is light and has a certain anti-corrosion ability. However, this kind of anti-corrosion ability is limited. Liquid nitrogen is an alkaline substance and has no corrosive effect. However, during use, moisture will slowly accumulate inside the container and propagate bacteria; sometimes the semen will fall off; especially in the case of low liquid nitrogen purity, the inner and bottom of the inner tank are easily corroded and blackened. And blistering. Although stainless steel has a strong anti-corrosion ability, manufacturers often use aluminum alloys in order to reduce costs. Therefore, we must remind us that we must take effective measures to prevent corrosion in the inner tank. The best way is to use the liquid nitrogen with the highest purity (99.8%) produced by the liquid nitrogen machine at the liquid nitrogen supply station instead of the industrial waste liquid nitrogen with lower purity. The second is to eliminate the accumulation of the bottom of the container. The moisture and dirt can be cleaned once a year by the inner tank, which greatly enhances the ability of the container to resist corrosion.
1.2.2 Reduced vacuum
Liquid nitrogen is not only gasified, but also has a very low boiling point (195.8 ° C) and is easy to evaporate. Our goal is to use a container containing liquid nitrogen to store frozen semen at low temperatures without the need to evaporate large amounts of liquid nitrogen. In order to reduce gasification and reduce evaporation, and to have sufficient liquid nitrogen in the container to maintain a high degree of refrigeration capacity, it is necessary to take thermal insulation measures. That is, the sandwich structure E of the container is required to have a high vacuum to block the conditions for promoting gasification due to heat. Vacuum is applied between the interlayers (up to 0.001 mm Hg), and activated carbon or silica gel capable of absorbing a large amount of gas is placed between the interlayers to achieve a vacuum of 10.7 (absolute atmospheric pressure) because of the heat transfer layer of the vacuum layer. Slow, it is a very good thermal insulator, which can reduce the loss of freezing, and at the same time, the vacuum can be maintained for a long period of time due to the action of the adsorbent. If there is a problem with the vacuum between the layers of the container, the cold retention performance of the container will change. For example, condensation on the outside of the container, or freezing into a white state, is usually a sign of a vacuum. If the container is subjected to technical testing, there is an increase in liquid nitrogen consumption, which is a symbol of deterioration of the degree of vacuum, and the measure for taking repairs should be vacuum evacuation.
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