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3.3.3.4.Reconnect the air-supply line.Allow the pressure to 3.4.1.6.Pressurize the primary tank to 5 psig.Allow the stabilize at 5 psig[3 psig for a 12-foot tank]by adding or pressure to stabilize by adding or removing air as necessary. removing air as necessary. Note: The liquid level will rise during the air test. 3.3.3.5.Close the air-supply valve on the test manifold. Disconnect the air-supply line. 3.4.1.7.Close the air-supply valve on the test manifold. 3.3.3.6.Soap the entire exterior of the tank.Watch for active air Disconnect the air-supply line. bubbles,which indicate a leak.Pay special attention to fittings and 3.4.1.8.Soap all service fittings and manways.Watch for active manways.Lift the tank to check the bottom. Do not roll the tank. air bubbles, which indicate a leak. Check the reservoir for 3.3.3.7.Monitor the pressure for one hour. bubbles in the monitoring fluid.(The level of the monitoring fluid in the reservoir will naturally rise due to the pressure in the AWARNING primary tank.) Do not stand under the tank. This could result in death, 3.4.1.9. Monitor the pressure for one hour. serious personal injury or property damage. 3.3.3.8.When the test is complete,carefully release the air 3.4.1.10.When the test is complete,carefully release the air pressure from the tank by opening the air-supply valve. pressure from the tank by opening the air-supply valve. 3.3.3.9.When the air flow stops,remove the test manifold. 3.4.1.11.When the air flow stops,remove the test manifold. 3.4.TESTING A DOUBLE-WALL TANK WITH LIQUID-FILLED 3.4.1.12.Check the liquid level in the reservoir. It should be at INTERSTITIAL SPACE approximately the same level as the pretest level. ACAUTION 3.4.2.SECONDARY T (EXTERNAL) Do not connect air supply direcdy to the interstitial-space monitor ftng.Pressurizing the secondaty tank(interstitia/ T' ON space)by 11seff may damage the primary tank or cause Do not connect air supply difedy to the interstitial-space tank Failure. monitor fitting.Pressurong the secondaty tank(interstitial space)by itself may damage the primary tank or cause 3.4.1. PRIMARY TANK(INTERNAL) tank failure. 3.4.1.1. Keep the tank vertical(the reservoir on top)at all times or the monitoring fluid may drain from the reservoir. 3.4.2.1.Check the exterior of the tank for monitoring fluid.(The monitoring fluid is dyed blue to distinguish between moisture 3.4.1.2.Remove all temporary service fitting plugs,redope,and and monitoring fluid.)If monitoring fluid is found,wipe the tank reinstall all fitting plugs except one(needed for test manifold) dry and verify that the monitoring fluid does not reappear.Lift and the fitting on the reservoir. Install permanent plugs in all the tank to check the bottom. Do not roll the tank. unused openings. Do not open the monitor fitting (if present) or monitoring fluid could be lost. E_ AWARNING Do not stand under the tank. This could result in death, 3.4.1.3.Check the liquid level in the reservoir.It should be about 114 full. serious personal injury or property damage. 3.4.1.4.Visually check the interior of the tank for liquid.There 3.4.2.2.Visually check the interior of the tank for liquid.There should not be any. should not be any. 3.4.1.5.Install the test manifold in the open service fitting.Connect the pressure source to the test manifold.(See FIGURE 3-5.) 3.4.2.3.Replace the protective covers in the service fitting and the reservoir fitting. From Air Supply Air-Supply Pressure-Relief 3.5. TESTING A SINGLE-WALL MULTICOMPARTMENT Valve Device Reservoir TANK WITH SINGLE BULKHEAD Air-Supply Fitting Gauge 3.5.1. GENERAL 3.5.1.1.Remove all temporary service fitting plugs,redope and Servi reinstall all fitting plugs except one in each compartment Fitting (needed for test manifolds). Install permanent plugs in all unused openings. (See FIGURE 3-6 and FIGURE 3-7.) FIGURE 3-5 5