Regarding airtightness testing
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For pneumatic pressure tests with pressures greater than 0.6 MPa, codes recommend using hydraulic tests as a substitute. So the question is: if the pressure used in a pneumatic leak test is very high, is there any way to use an alternative?
The pressure for hydraulic testing also has limits; not all pressures can be used as substitutes.
The safety level for hydrostatic testing is high; it must be carried out in accordance with the relevant standards, and in some cases the involvement of regulatory authorities is required. A pressure of 0.6 MPa falls within the category of low pressure.
Airtightness testing and pressure testing are two different concepts. A pneumatic test can be replaced by a hydraulic test, but a gas-tightness test cannot be replaced by a hydraulic test.
You say the hydrostatic test pressure is quite low, right? I’ve carried out hydrostatic tests up to 25 MPa, and also airtightness tests at 15 MPa
The hydrostatic test is a strength test； The airtightness test is a tightness test; the pressure can be lower ； There are various forms of airtightness testing; be sure to look into relevant information!
A gas-tightness test is not the same as a pressure test; the former is a type of leak detection test, and generally the test value equals the design pressure； The latter is a strength test, and the typical test value is equal to the design pressure * 1.15
The airtightness test can be replaced by ammonia testing and helium testing, etc