During normal operation of the liquid nitrogen tank, can instrument air be used instead of nitrogen for insulating layer inflation? What is the reason?
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During normal operation of the liquid nitrogen tank, can instrument air be used instead of nitrogen for insulating layer inflation? What is the reason?
If the dew point of the instrument air is around -65 degrees, it can be used as a substitute for a short period of time, but it is not recommended to use air as a sealing gas source for extended periods~~
Why can it only be used as a temporary replacement?
Fear of oxygen accumulation in the interlayer~~
The reason should still be the dew point; after all, even though instrument air is dry, it still contains water, and over time, the perlite will lose its insulating properties.
If possible, an air stream can be connected after the molecular sieve to ensure the dew point meets the requirements~~
Instrument air should come after the molecular sieve, but a satisfactory dew point does not mean there is no water present. Personally, I think it’s better to use nitrogen.
Therefore, when analyzing the dew point, it is necessary to conduct the analysis near the sealed gas, and eliminate all possible sources of contamination. Of course, it’s best to have nitrogen available~~