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PEI/RP1200-17 <br /> 4.2.2 Description of Test. A partial vacuum is <br /> 4. TANK SECONDARY drawn on the interstitial space and it is monitored <br /> CONTAINMENT INTEGRITY for a specified period of time.If the vacuum level is <br /> TESTING 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 /> 4.1 General. Double-walled tanks have interstitial <br /> spaces that can be tested for integrity. 4.2.3 Test Conditions. The primary tank may <br /> contain any level of product. No bulk deliveries <br /> There are two methods for testing the integrity of tank shall occur during the test. <br /> secondary containment systems: dry and wet. Dry test <br /> methods use a partial vacuum to determine the integrity ' <br /> of the containment.To perform a wet test on an existing - <br /> liquid-filled tank interstitial space, the liquid level in <br /> the interstitial space is raised and is monitored for a <br /> specified period of time to determine if the containment <br /> has integrity. <br /> A tank secondary containment integrity test does not <br /> necessarily determine whether the primary tank is tight <br /> because portions of the primary tank, such as tank fit- <br /> tings and manway openings, may not be included in the <br /> containment integrity test. <br /> 4.2 Tank Secondary Containment Integrity Testing <br /> —Dry Test Method <br /> 4.2.1 Purpose. This method is used to test the <br /> integrity of the dry secondary containment of a <br /> UST. <br /> FIGURE 4-1.A cutaway view of a double-walled tank. <br /> Plumber's <br /> Plug <br /> Vacuum Automatic Vacuum Control 0-30"Hg <br /> Source Shutoff Valve Valve Vacuum Gauge <br /> Tank <br /> FIGURE 4-2.Schematic of the dry test method apparatus. <br /> 0 pei.org <br />