Why is a second gas-tightness test required?
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Why is a second gas-tightness test required?
Do it at different pressures; for example, try it at 10 kilograms, once at 15 kilograms, and once at 20 kilograms. This is mainly to check whether there are still leaks after making repairs, in case there are any. If the pressure is increased to its maximum level all at once, there’s a risk that leaks might become larger, making them harder to deal with.
I agree with the opinion above; in places where the pressure is relatively high, it may be necessary to make more frequent pressure measurements. The regulations state that: \"The rate of pressure increase during testing should not be too fast; the pressure should rise gradually, with an increase of no more than 1 MPa per hour.\" When the pressure rises to 0.3 times and 0.6 times the test pressure, the pressure increase should be stopped respectively; the pressure should be held constant for 30 minutes, and the system should be checked for any abnormalities. If no abnormalities are found, the pressure increase can continue. ” The reason is likely similar to that above; the regulations state that pressure must be reduced when dealing with leakage points, and raising it too much at once might not be appropriate
According to the operating instructions for chemical plants, to reach the desired pressure, it is necessary to increase it step by step by 10%, 50%, 60%, 70%, 80%, 90%, or 100%; at each stage, the pressure must be maintained for a certain period of time, and leaks must be checked.
It is also taken into account that a too high voltage increase can be dangerous in the event of a large leak.
If the pressure is increased too much at once, large leaks will occur, which is a waste of gas supply.
Two times is considered few; I have done airtight tests more than a dozen times. After nitrogen, do hydrogen.
Use hydrogen? ? Every time I see it, isn’t hydrogen cheap? ?