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-,commended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities <br /> tterstitial space is raised and is monitored for a speci- 4.2 Tank Secondary Containment integrity Testing <br /> ed period of time to determine if the containment has — Dry Test Method <br /> ►tegrity. <br /> 4.2.1 Purpose. This method is used to test the <br /> , tank secondary containment integrity test does not integrity of the dry secondary containment of a <br /> ecessarily determine whether the primary tank is tight UST. ={ <br /> ecause portions of the primary tank,such as tank fittings <br /> nd manway openings, may not be included in the con- <br /> 4.2.2 Description of Test. A partial vacuum is <br /> airirnent 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 /> CAUTION: Use only an air-operated 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 venturi-eductor or outside any <br /> ' Class 1, Division 1 area. <br /> FIGURE 41. A cutaway view of a double-walled tank. <br /> of <br /> X <br /> Plumber's <br /> Plug <br /> Vacuum Automatic Vacuum Control 0-30"Hg <br /> Source Shutoff Valve Valve Vacuum Gauge <br /> ss; <br /> Tank <br /> FIGURE 42. Schematic of the dry test method apparatus. <br /> ' <br /> pei.org <br />