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tf <br /> PEIIRP1 200-17 <br /> 4.2.2 DescrWfon of Test. A partial vacuum is <br /> 4. TANS{ SECONDARY drawn on the interstitial space and it is monitored <br /> ONTAINMENT INTEGRITY for aspecified period-of time.Ifthe vac uurn [eve lis <br /> maintained, the containment system has passed the a <br /> TESTING test. The vacuum test time depends on the volume <br /> 4 <br /> of the annular space and site conditions. <br /> 4.1 General. Double-walled tanks have interstitial R <br /> spaces that car_ he tested for integrity. 4.2.5 Test Conditions. The primary tank may <br /> contain any level of product. No bulk deliveries a� <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 a <br /> of the containment. To perforin a wet test on an existing f <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 rank, 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 tsed to test the <br /> integrity of the dry secondary containment of a <br /> FIGURE 4A. A cutaway view c a double-waIred tarrk. <br /> Plumber's <br /> PILg <br /> Vacuum Autumatio Vacuum Control 0-30'Hg <br /> Source Shutoff Valva Valva Vacuum Gaugo <br /> Tank <br /> FIGURE 4-2. Schematic of the dry test method apparatus. <br /> 0 pei.org <br />