Test pressure for externally pressurized vessels
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I would like to ask everyone: the minimum operating pressure is -0.1 MPa, and the maximum operating pressure is 0.5 MPa. What pressure should be used during the hydrostatic test? 1.25*0.5?
It seems that we still need to conduct a 0.1Mpa airtightness test, and some foreigners have asked us to carry out a vacuum pumping test as well.
Withstand voltage test: 1.25*0.5*allowable stress ratio. Whether to perform a gas-tightness or vacuum leak test is determined by the required vacuum level.
However, the hydrostatic test pressure shown on the condition chart is 0.26 MPa, which is quite confusing
Hydraulic testing generally does not need to be provided by the process team or the customer, but is determined by the designers.
0.26 is clearly not sufficient; when internal and external pressures are present, a higher value should be used for the pressure resistance test, as containers under external pressure also undergo internal pressure tests.
GB150 stipulates that external-pressure vessels are also subject to internal pressure testing.