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pei.org 13 <br />Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities <br />5.3.6 Pass/Fail 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.