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Recommended Practices for the Testing and Verification of Spill , Overfill , Leak Detection and Secondary Containment Equipment at UST Facilities <br /> interstitial space is raised and is monitored for a speci - 4. 2 Tank Secondary Containment Integrity Testing <br /> Pied period of time to determine if the containment has — Dry Test Method <br /> integrity. <br /> 4. 2 . 1 Purpose . This method is used to test the <br /> A tank secondary containment integrity test docs 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 manway openings , may not be included in the con- 4. 2 . 2 Description of Test . A partial vacuum is <br /> tairnnent integrity test , drawn on the interstitial space and 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 bulk deliveries <br /> shall occur during the test . <br /> – _ _ – . - <br /> CAUTION : Use only an air-operated vacu- <br /> f 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 venturi-eductor or outside any <br /> Class 1 , Division 1 area . <br /> FIGURE 44. 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 /> Tank <br /> FIGURE 42 . Schematic of the dry test method apparatus. <br /> pei , org O <br />