Regarding the issue of equipment pressure testing, it’s the first time I’ve seen this in all these years
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After passing the pressure test, the equipment is dried, and the dew point after drying reaches -5°C. I’m asking all the experts here to help explain it!
It’s a matter of the water vapor content in the gas; the dew point requirement for instrument air is several dozen degrees below zero.
It means that after drying, it must be sealed before being shipped. Just as it is required to transport under inert gas protection.