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Influence of leakage on service life of liquid nitrogen tank

Time: 2019-06-05 10:49 Source: unknown Author: Bander liquid nitrogen tank Click: second
This paper introduces the test of the influence of air leakage rate on the vacuum life of liquid nitrogen container, describes the test method, device, steps and relevant calculation. The variation values of interlayer pressure and daily evaporation rate of 3 L and 10 L liquid nitrogen biological containers under different air leakage rates are measured, and their variation curves are given. Self pressurized liquid nitrogen tank

The test results show that in order to ensure the product life of 5 years, the influence of air leakage on interlayer pressure and daily evaporation rate can be divided into three stages: when the air leakage rate is less than 1.58 × 10 ^ - 7 and 2.5 × 10 ^ - 7 PA · m ^ 3 / s, the influence can be ignored; when the leakage rate is greater than the above value, the influence can not be ignored; once the air leakage rate exceeds 8.23 × 10 ^ - 7 and 1.33 × 10 ^ - 7, the influence can not be ignored ^-If the vacuum rate is higher than 50 s / D, the product will not be able to maintain evaporation for more than 5 years.

Such a large leakage rate will not be allowed. At the end of the paper, it is pointed out that the air leakage rate is too high in the current standards for cryogenic vessels, so it is necessary to further test and formulate more economical and reasonable index requirements. Self pressurized liquid nitrogen tank

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