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PEIIR P1 Z00-17 9;; <br /> ,a <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 9 <br /> TESTING maintained,the containment system has passed the a <br /> test. The vacuum test time depends on the volume 4 <br /> of the annular space and site conditions. <br /> 4.1 General. Double-walled tanks have interstitial 4.2.3 Test Conditions. The primary tank may <br /> spaces that car. be tested for integrity. <br /> contain any level of product. No bulk deliveries r <br /> There are two methods for testing the integrity of tank shall occur during the test. e <br /> secondar• containments stems: d and wet. Dr test <br /> Y Y dry Y �---�•:,- �� <br /> methods use apartial vacuum to determine the integrity a <br /> of the containment. To perform a wet test on an existing g <br /> liquid-filled tank interstitial space, the liquid level in I <br /> the interstitial space is raised and is monitored for a s <br /> specified period of time to determine if the containment <br /> has integrity. <br /> A tank secondary containment integrity test does not <br /> I <br /> necessarily determine whether the primary tank is tightJ . <br /> because portions of the primary tank, such as tank fit- <br /> tings and manway openings, may not be included to the ate• <br /> containment integrity test <br /> 4.2 Tank Secondary Containment Integrity Testing <br /> — Dry Test Method i <br /> 4.2.1 Purpose. This method is used to test the <br /> i_itct__ of the dry secondary containment of a <br /> FIGURE 4-1. A cutaway view of a double-walled tank. <br /> ., <br /> 1 'umber's <br /> r rl:q <br /> Vacuum Automatic Vacuum Control a-30`Hg <br /> Source ShutoM Valve Valve Vacuum Gauge <br /> Tank <br /> FIGURE 4-2. Schernat;c of the dry test r7ethcd at,?aaratus. <br /> 0 pei.org <br />