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3.1.11. After installation and before backfilling to grade, testing must <br />be repeated to verify that no damage has occurred during installation. <br />WARNING <br />When the tank is under pressure, the manways and/or <br />bttings may dislodge, or the tank could rupture and result <br />in death or serious injury. Before beginning the test, notify <br />all people on the test site to remain in a safe location. <br />ALWAYS ATTEND TO THE TANK DURING THE TEST. Stand <br />clear of manways, fittings and tank ends during the test. <br />®WARNING <br />The maximum test pressure is 5 psig [3 psig for a 12 -foot - <br />diameter tank]. Position the pressure gauge so that the pressure <br />readings can be clearly read at all times. Failure to follow this <br />warning could result in death or serious injury. (See FIGURE 3-2.) <br />FIGURE 3-2 <br />WARNING <br />The pressure -relief device or regulated air source must be <br />rated at a maximum of 6 psig [4 psig for a 12 -foot -diameter <br />tank] to reduce the risk of overpressurizing the tank. Failure <br />to follow this warning could result in death or serious injury. <br />3.2. TESTING A SINGLE-WALL TANK <br />3.2.1. Remove all temporary service -fitting plugs. <br />3.2.2. Redope fittings and install plugs in all openings, except <br />one service fitting (needed for the test manifold). Follow <br />instructions in Point 3.1.5. <br />3.2.3. Install the test manifold in the open service fitting. Connect <br />the pressure source to the test manifold. (See FIGURE 3-3.) <br />FIGURE 3-3 <br />3.2.4. Pressurize the tank to 5 psig [3 psig for a 12 -foot -diameter <br />tank]. Allow the pressure to stabilize by adding or removing air <br />as necessary. <br />3.2.5. Close the air -supply valve on the test manifold. Disconnect <br />the air -supply line. <br />3.2.6. Soap the entire exterior of the tank, checking for leaks. <br />(Follow instructions in Points 3.1.6. through 3.1.8., including <br />Warnings following 3.1.8.) Watch for active air bubbles, which <br />indicate a leak. Pay special attention to fittings and manways. <br />3.2.7. Monitor the pressure for one hour. <br />3.2.8. When the test is complete, carefully release the air <br />pressure from the tank by opening the air -supply valve. <br />3.2.9. When airflow stops, remove the test manifold. <br />3.2.10. Replace the protective covers in the service fittings. <br />3.3. TESTING A DOUBLE-WALL TANK WITH A DRY <br />INTERSTITIAL SPACE <br />3.3.1. GENERAL <br />3.3.1.1. The tank will arrive with a quick -disconnect assembly. <br />(See FIGURE 3-4.) <br />3.3.1.2. If the tank is not configured as shown in FIGURE 3-4 <br />prior to preinstallation testing, call the UST coordinator at the <br />Xeres plant nearest you. <br />3.3.2. PRIMARY TANK (INTERNAL) <br />3.3.2.1. Remove all temporary service -fitting plugs. <br />3.3.2.2. Redope fittings and install plugs in all openings, except <br />one service fitting (needed for the test manifold). Follow <br />instructions in Point 3.1.5. <br />3.3.2.3. Install the test manifold in the open service fitting. Connect <br />the pressure source to the test manifold. (See FIGURE 3-4.) <br />FIGURE 3-4 <br />3.3.2.4. In order to test the primary tank alone, the quick - <br />disconnect assembly must not be connected to the service <br />fitting — keep the nylon tie in place. <br />3.3.2.5. Pressurize the primary tank to 5 psig [3 psig for a 12 - <br />foot -diameter tank]. Allow the pressure to stabilize by adding or <br />removing air as necessary. <br />3.3.2.6. Close the air -supply valve on the test manifold. <br />Disconnect the air -supply line. <br />11 <br />