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Recommended Pracfices for the Teingand Verification of Spill,Overfill,Leak Detection and*dary Containment Equipment at UST Facilities <br /> interstitial space is raised and is monitored for a speci- 4.2 Tank Secondary Containment Integrity Testing <br /> fied period of time to determine if the containment has —Dry Test Method k <br /> integrity. 4.2.1 <br /> ® 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 tark 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 /> CAUTWN: Use only an air-operated vacu- <br /> um source or a vacuum pump po~ed by <br /> an explosion-proof motor. Vacuum pumps <br /> with electric motors that are not expIG- <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 /> ftom the ventu"ductor or outside any <br /> Class 1, Division I area. <br /> FIGURE 4-L A cutaway view of a doubWwalled tank. <br /> Plurnber's <br /> Plug <br /> Vacuum Automatic Vacuum Control 0-30"Hg <br /> Source Shutoff Valve Valve Vacuum Gauge <br /> Tank <br /> FIGURE <br /> ®Schematic of the dry test method apparatus. <br /> peLorg ca <br />