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Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities <br /> 5.3.6 Pass/Fall Criteria. If no pressure change <br /> occurs during the test period, the piping system <br /> passes the secondary containment integrity test.If <br /> there is any drop in pressure over the test period, <br /> the piping fails the secondary containment integrity <br /> test.If there is any increase in pressure over the test <br /> period,repeat the test. <br /> pei.org <br />