Why are there requirements for the test air to be “dry and clean”?
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For the gas used in pressure tests and airtightness tests, the standard specifies “dry, clean air”. Is there any other reason why air is required to be “dry,” aside from corrosion caused by water or moisture after compression? Besides, the testing period isn’t that long either – will it have a significant impact? After thinking for a while, it seems I could only think of the impact of humid environments on material corrosion. There must be other reasons as well!
Gas molecules and water molecules have different sizes
First, for the accuracy of the tests, the properties of air should vary at different humidity levels; second, to prevent condensation water from affecting the test results
This is a basic requirement; cleanliness and dryness are also relative and qualitative, with no quantitative requirements