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Recommended Practices for the Testing aad Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at LIST Facilities <br /> interstitial space is raised and is monitored for a speci . 4 . 2 Tank Secondary Containment Integrity Testing <br /> lied period of timc to detennine if the containment has — Dry Test Method <br /> A <br /> ntegrity. <br /> 4 .2 .1 Purpose , This method is used to test the <br /> A tank secondary containment integrity test does not integrity of the dry secondary containment of a <br /> necessarily determine whether the primary tank is tight UST- <br /> because portions of the primary tank , such as tank fittings <br /> and ru:utw.ty openings, 4. 2. 2 Description of Test. A partial vacuum is <br /> ngs, may not he included in the con - <br /> tainntent integrity test . drown on the interstitial space autd it is monitored <br /> for a specified period of time . If the vacuum level is <br /> maintained, the containment system has passed the <br /> test . The vacuum test time depends on the volume <br /> of the annular space and site. conditions. <br /> 4. 2 .3 Test Conditions. The primary tank may <br /> contain any level of product , No hulk deliveries <br /> shall occur during the test, <br /> CAUTION ; Use only an aWoperated vacu- <br /> um source or a vacuum pump powered by <br /> an explosion-proof motor. Vacuum pumps <br /> with electric motors that are not explo- <br /> sion-proof may Ignite flammable vapors , <br /> If a portable air compressor is used , it <br /> should be located at least 20 feet away <br /> from the venturl•eductor or outside any <br /> Class 1 , Division 1 area . <br /> FIGURE 41. A cutaway view of a double-walled tank. <br /> Plumber's <br /> Plug <br /> Vacuum Automatic Vacuum Control 0 30' Hg <br /> Source Shutoff Valve Valve Vacuum Gauge <br /> RECEIVED <br /> DEC 0 3 2019 <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br /> Ta n k <br /> FIGURE 42 . Schematic of the dry test method apparatus. <br /> pei .org <br />