Air-cooled pressure testing
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We had an air-cooled unit; when pressurized to 15 kilograms, it failed the tests after two or three days – the pressure drop was very large. Even after checking at around 5 kilograms, no leaks were found. The unit was left there for another two or three days, after which all the blind flanges were removed, the unit was refilled with water and pressurized again. It still failed the tests at first, but then compression testing was carried out again, and miraculously, the pressure didn’t drop at all – the unit passed the tests. Could some expert explain the reason?
One or more of the pipes are blocked, but not completely; when water is poured in, it does not fill the pipes completely. By applying pressure repeatedly, the entire pipeline system can be filled, after which the pressure no longer drops.
What you say is possible. The air-cooled medium is aviation fuel, so it shouldn’t get clogged in theory
Is it possible that it’s slag, stones, or something like that?