Reasons for increasing the test pressure in the secondary hydrostatic test
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According to GB/T 9251-1997, if during the hydrostatic test of a gas cylinder it is discovered that there were errors in the preparations prior to the test or at some point during the test that could affect the accuracy of the test results, then such hydrostatic test is invalid. For the test bottles that failed the test, if the test pressure has already reached over 90% of the specified test pressure, the test pressure should be increased by 0.7 MPa, or raised to 1.1 times the original test pressure (whichever value is lower), and the test should be repeated. What is the basis for attempting to increase the test pressure again? Is there any theoretical basis or experimental data supporting an increase of 0.7 MPa in the test pressure? Please share some ideas and suggestions! Thank you. .
The approach for containers and gas cylinders regarding this issue should be the same: try it first by yourself, and then wait for everyone’s responses