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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 sped - 4,2 Tank Secondary Containment Integrity Testing <br /> fied period of time to determine if the containment has — Dry Test Method <br /> intcgrtty. 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 manw:ty openings, may not be included in the con - 4. 2.2 Description of Test . A partial vacuum is <br /> tainntent 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 /> 71 <br /> CAUTION : Use only an air operated vacu- <br /> um source or a vacuum pump powered by <br /> an exploslon-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 /> Jim <br /> FIGURE 41. A cutaway view of a double-walled tank. <br /> - _ s'lumber's <br /> Plug <br /> Vecuum Automatic Vacuum Control o - 30' Ho <br /> Source Shutoff Valve Valve Vacuum Gauge <br /> i <br /> i <br /> Tank <br /> FIGURE 42 . Schematic of the dry test method apparatus. <br /> pei . org <br />