When is a pressure test conducted to check for leaks in the welds?
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When is a pressure test conducted to check for leaks in the welds? Isn’t it too dangerous to do this at the test pressure? How do you carry out such tests?
Leak detection through pressure testing seems to be specified in the new regulations; it involves applying bubble solution to the welds, somewhat similar to what is done when fixing a tire. In my opinion, leak detection using pressure testing cannot replace a proper leak test. As for when to inspect it, it should be during the pressure holding phase. ~
As mentioned in the regulations, the pressure is designed at 50% of the rated value for inspection, and then leakage is checked and the pressure is restored.
Personally, I think soap water should be applied when the pressure is maintained at 87%, but the main purpose of a pressure test is to assess strength; generally, a leak test is carried out after applying pressure
Section 10.9.5.4 of GB150 specifies the timing for checking for leaks in welded joints during pressure testing. It states that \"once the pressure reaches 10% of the specified test pressure, and this value does not exceed 0.05 MPa, the pressure should be held for five minutes before conducting the first leak check.\" It also specifies that \"after reaching the test pressure, the pressure should be held for ten minutes, then reduced to 87% of the specified test pressure; after maintaining this pressure for a sufficient length of time, another leak check should be conducted.\" ” Pneumatic testing is relatively dangerous, and the provisions of the Pressure Vessel Code and GB150 must be strictly followed. It is recommended not to use it.
I believe leak testing should be conducted under each pressure level; once it is confirmed that there are no leaks at low pressures, the pressure is increased and testing continues until the final required test pressure is reached.