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3.3.2.7.Soap all service fittings and manways.Watch for active fitting.Follow instructions in Point 3.1.5.Do not open the air bubbles,which indicate a leak. monitor fitting(if present)or monitoring fluid could be lost. 3.3.2.8.Monitor the pressure for one hour. 3.4.1.6.Install the test manifold in the open service fitting.Connect the pressure source to the test manifold.(See FIGURE 3-5.) 3.3.3.SECONDARY TANK(EXTERNAL) 3.3.3.1.Maintain the pressure in the primary tank. Air-Supply Valve Reservoir Fitting Nr-Suppy Air-Supply Gauge CAUTION Gauge Pressure-Relief Do not connect air supply directly to the interstitial-space Device monitor fitting.Pressurizing the secondary tank(interstitial space)by itself may damage the primary tank or cause tank failure. 3.3.3.2.Free the hose from the service fitting by cutting the nylon tie. FIGURE 3-5 3.3.3.3.Insert the hose into the quick-disconnect fitting.This will 3.4.1.7.Pressurize the primary tank to 5 psig.Allow the allow air to transfer from the primary tank to the secondary tank. pressure to stabilize by adding or removing air as necessary. 3.3.3.4.Reconnect the air-supply line.Allow the pressure to 3.4.1.8.Close the air-supply valve on the test manifold. stabilize at 5 psig[3 psig for a 12-foot-diameter tank]by adding Disconnect the air-supply line. or removing air as necessary. 3.4.1.9.Soap all service fittings and manways.Watch for active 3.3.3.5.Close the air-supply valve on the test manifold. air bubbles,which indicate a leak.Look through the laminate for Disconnect the air-supply line. any active air bubbles rising to the top.Their presence would 3.3.3.6.Soap the entire exterior of the tank,checking for leaks. indicate an internal leak.Also,check the reservoir for bubbles in (Follow instructions in Points 3.1.6.through 3.1.8.,including the monitoring fluid.(The monitoring-fluid level will rise Warnings following 3.1.8.)Watch for active air bubbles,which during the air test.) indicate a leak.Pay special attention to fittings and manways. 3.4.1.10.Monitor the pressure for one hour. 3.3.3.7.Monitor the pressure for one hour. 3.4.1.11.When the test is complete,carefully release the air 3.3.3.8.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. 3.4.1.12.When the airflow stops,remove the test manifold. 3.3.3.9.When the airflow stops,remove the test manifold. 3.4.1.13.Check the level of the monitoring fluid in the reservoir. 3.3.3.10.Replace the protective covers in the service fittings. It should be at approximately the same level as the pretest level. 3.4.TESTING A DOUBLE-WALL TANK WITH A WET 3.4.2.SECONDARY TANK(EXTERNAL) INTERSTITIAL SPACE CAUTION CAUTION Never pressurize a wet interstitial space.Doing so may Never pressurize a wet interstitial space.Doing so may damage the primary tank or cause tank failure. damage the primary tank or cause tank failure. 3.4.2.1.Check the exterior of the tank for monitoring fluid.(The 3.4.1.PRIMARY TANK(INTERNAL) monitoring fluid is dyed blue to distinguish between moisture 3.4.1.1.Keep the tank vertical(the reservoir on top)at all times and monitoring fluid.)If monitoring fluid is found,wipe the tank or the monitoring fluid may drain from the reservoir. dry and verify that the monitoring fluid does not reappear.Lift the tank to check the bottom.Do not roll the tank. 3.4.1.2.Remove all temporary service-fitting plugs and the reservoir-fitting plug. A WARNING 3.4.1.3.Check the monitoring-fluid level in the reservoir.It Do not lift the tank when the tank is under pressure. This should be about 1/4 full. could result in death or serious injury. 3.4.1.4.Visually check the interior of the tank for monitoring 3.4.2.2.Visually check the interior of the tank for monitoring fluid.There should not be any. fluid.There should not be any. 3.4.1.5.Redope fittings and install plugs in all openings,except 3.4.2.3.Replace the protective covers in the service fitting and one service fitting(needed for the test manifold)and the reservoir the reservoir fitting. 6