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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 /> fled period of time to determine if the containment has = Dry Test Method <br /> integrity. 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 manway openings, may not be included in the con- 4. 2.2 Description of Test. A partial vacuum is <br /> tainment 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 /> F ' CAUTION : Use only an air-0perated vacw <br /> um source or a vacuum pump powered by <br /> an explosion•proof motor. Vacuum pumps <br /> with electric motors that are not expio- <br /> slon-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 double-walled tank. <br /> Plumber's <br /> Plug <br /> Vacuum Automatic Vacuum Control 0 - 30" Hg <br /> Source Shutoff Valve Valve Vacuum Gauge <br /> R E C E <br /> PHI 21] 19 <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br /> Tank <br /> FIGURE 4-2. Schematic of the dry test method apparatus. <br /> pet.org CM <br />