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1�1 3.2. TESTING A SINGLE-WALL TANK 3.2.1. Remove all temporary service fitting plugs, redope and reinstall all fitting plugs except one (needed for test manifold). Install permanent plugs in all unused openings. 3.2.2. Install the test manifold in the open service fitting. Connect the pressure source to the test manifold. (See FIGURE 3-3.) Air -Supply Valve From Air Supply Pressure -Relief Device Air -Supply Gauge Service Fitting WL' 3.2.3. Pressurize the tank to 5 psig [3 prig for a 12 -foot tank]. Allow the pressure to stabilize by adding or removing air as necessary. 3.2.4. Close the air -supply valve on the test manifold. Discon- nect the air -supply line. 3.2.5. Soap the entire exterior of the tank. Watch for active air bubbles, which indicate a leak. Pay special attention to fittings and manways. Lift the tank to check the bottom. Do not roll the tank. 3.2.6. Monitor the pressure for one hour. 1 G Do not stand under the tank. This could result in death, serious personal injury or property damage. 3.2.7. When the test is complete, carefully release the air pressure from the tank by opening the air -supply valve. 3.2.8. When air flow stops, remove the test manifold. INTERSTITIAL SPACE 3.3.1. GENERAL 3.3.1.1. The tank will arrive with a quick -disconnect assembly. (See FIGURE 34.) 3.3.1.2. If the tank is not configured as shown in FIGURE 3-4 ®prior to preinstallation testing, call the UST coordinator at the Xerxes plant nearest you. ---------------- Nylon Tie From Air Supply = Pressure- Air -Supply ------ ` Relief Device Valve Air -Supply Quick -Disconnect Gauge Assembly Service Monitor Fitting— ``-� Fitting 3.3.2. PRIMARY TANK (INTERNAL) 3.3.2.1. Remove all temporary service fitting plugs, redope and reinstall all fitting plugs except one (needed for test manifold). Install permanent plugs in all unused openings. 3.3.2.2. Install the test manifold in the open service fitting. Connect the pressure source to the test manifold. (See FIGURE 3-4.) 3.3.2.3. In order to test the primary tank alone, the quick - disconnect assembly must not be connected to the service fitting — keep the nylon tie in place. 3.3.2.4. Pressurize the primary tank to 5 psig [3 psig for a 12 - foot tank]. Allow the pressure to stabilize by adding or removing air as necessary. 3.3.2.5. Close the air -supply valve on the test manifold. Disconnect the air -supply line. 3.3.2.6. Soap all service fittings and manways. Watch for active air bubbles, which indicate a leak. 3.3.2.7. Monitor the pressure for one hour. 3.3.3. SECONDARY TANK (EXTERNAL) 3.3.3.1. Maintain the pressure in the primary tank. Do not conned air sup* di to the interstitial -space monitor fitting. Pressurizing the secondaty tank (interstitial space) by itse/fmay damage the primary tank or cause tank failure. 3.3.3.2. Free the hose from the service fitting by cutting the nylon tie. 3.3.3.3. Insert the hose into the quick -disconnect fitting. This will allow air to transfer from the primary to the secondary tank.