What pressure drop is considered acceptable for a gas tightness test?
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Once the system has been purged, it needs to be pressurized to 0.5 MPag and 1.5 MPag respectively for a leak test. After maintaining this pressure for 24 hours, what percentage pressure drop is considered acceptable? No specific value was found in the standards. Please advise?
You can think of the so-called airtightness test as its strength test. There’s really no practical sense in calculating its leakage rate. If it comes to areas where foam testing is available, using foam for leak detection is indeed the most reliable method. It is the design institute or equipment manufacturer that must establish the standards; it’s something called the residual percentage. When measuring temperature and pressure, due to errors in the accuracy of instruments and their readings, the calculated values often exceed 100%. Well, in the end, a number is adjusted to fall within the standard range to settle things. For reference :)
Thank you. No leakage was detected in the foaming agent, but it’s difficult to determine whether there has been a slight drop in system pressure.
I remember it seems to be in 50236; you can check it
50236 is a pipeline welding standard; I haven’t read much, so don’t lie to me. \ud83d\ude02
I forgot the standard number; I’ll look it up for you when I’m at work tomorrow
By observing the temperature changes, the curve follows those temperature changes closely; it’s not possible to identify any leaks. The fact that both temperature and pressure decrease is acceptable. If that’s not the case, the holding time can be increased – perhaps the pressure has not yet reached equilibrium at the start. Specific values, percentages? I don’t know either.
In our company, for low pressures below 10 bar, the leakage rate is 5 per 10,000; for pressures above 10 bar, the leakage rate is 3 per 10,000