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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment FrInipmorit of I IS l Jlihor <br /> Interstitial space is rai .sed 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. <br /> �... 4 . 2 .1 Purpose . 1'his 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 , 4. 2.2 Description of Test. A partial vacuum is <br /> ngs , may not be included in the con - <br /> tainmenl integrity test , drawn on the interstitial spice 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 situ conditions . <br /> Ilk 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 expia <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 I , Division 1 area . <br /> FIGURE 41. A Gutaway view of a double- t;a )lcd tank. <br /> Plumber's <br /> Plug <br /> Vacuum Automatic Vacuum COrt O 0 30' Hg <br /> Source Shutoff Valve Valve Vacuum Gauge <br /> �., Tank <br /> FIGURE 42, Schematic of the dry test method apparatus. <br /> peLorg <br />