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3.7.2.5.Monitor the pressure for one hour.Do not release air 3.8.2.5.Redope fittings and install plugs in all openings,except pressure. one service fitting in each compartment(needed for the test manifolds)and the reservoir fitting.Follow instructions in Point 3.7.3.AIR TEST OF END TANK(S) 3.1.5. (See FIGURE 3-6 and FIGURE 3-7.) 3.7.3.1.Connect the pressure source to the test manifold on the end tank(s).(See FIGURE 3-3 and FIGURE 3-12.) 3.8.2.6.Before doing the air test of the base tank(described in SECTION 3.8.3.)and the air test of the end tank(s)(described in 3.7.3.2.Pressurize the end tank(s)to 5 psig.Allow the pressure SECTION 3.8.4.),install a test manifold in the open service to stabilize by adding or removing air as necessary. fitting on both the base and end tank(s). 3.7.3.3.Close the air-supply valve on the test manifold on each 3.8.3.AIR TEST OF BASE TANK'S PRIMARY TANK end tank.Disconnect the air-supply line. 3.8.3.1.Connect the pressure source to the test manifold on the 3.7.3.4.Soap all service fittings and manways on the end base tank.(See FIGURE 3-3 and FIGURE 3-11.) tank(s).Watch for active air bubbles,which indicate a leak. 3.8.3.2.Pressurize the primary tank of the base tank to 5 psig. Allow the pressure to stabilize by adding or removing air as 3.7.3.5.Monitor the pressure for one hour. necessary. 3.7.4.AIR TEST OF SECONDARY TANK 3.8.3.3.Close the air-supply valve on the test manifold on the 3.7.4.1.Attach the quick-disconnect hose assembly from the base tank.Disconnect the air-supply line. monitor fitting to the primary-tank service fitting(with a female quick-disconnect fitting in place).This will allow air to transfer to 3.8.3.4.Soap all service fittings and manways.Watch for active the interstitial space.(See FIGURE 3-4 and FIGURE 3-13.) air bubbles,which indicate a leak.Look through the laminate for 3.7.4.2.Add air as required and stabilize the air pressure in the any active air bubbles rising to the top.Their presence would total tank system to 5 psig. indicate an internal leak.Also,check the reservoir for bubbles in the monitoring fluid.(The monitoring-fluid level will rise 3.7.5.EXTERNAL SOAP TEST during the air test.) 3.7.5.1.Soap the entire exterior of the tank,checking for leaks. 3.8.3.5.Monitor the pressure for one hour.Do not release air (Follow instructions in Points 3.1.6.through 3.1.8.,including pressure. Warnings following 3.1.8.)Watch for active air bubbles,which indicate a leak.Pay special attention to fittings and manways. 3.8.4.AIR TEST OF END TANK(S)'PRIMARY TANK(S) 3.8.4.1.Connect the pressure source to the test manifolds on 3.7.5.2.Monitor the pressure for one hour. the end tank(s).(See FIGURE 3-3 and FIGURE 3-12.) 3.7.5.3.When the test is completed,carefully release the air 3.8.4.2.Pressurize the primary tank of the end tank(s)to 5 psig.Allow pressure from the tank by opening the air-supply valve. the pressure to stabilize by adding or removing air as necessary. 3.7.5.4.When the airflow stops,remove the test manifold. Note: The monitoring-fluid level will rise during the air test. 3.7.5.5.Replace the protective covers in the service fittings. 3.8.4.3.Close the air-supply valve on the test manifolds on the end tanks.Disconnect the air-supply line. 3.8.TESTING A DOUBLE-WALL MULTICOMPARTMENT TANK WITH A WET INTERSTITIAL SPACE 3.8.4.4.Soap all service fittings and manways.Watch for active air bubbles,which indicate a leak.Check the reservoir for CAUTION bubbles in the monitor fluid.(The level of the monitor fluid will Never pressurize a wet interstitial space.Doing so may naturally rise due to the pressure in the primary tank.) damage the primary tank or cause tank failure. 3.8.4.5.Monitor the pressure for one hour. 3.8.1.GENERAL 3.8.1.1.See FIGURE 3-10 for reference. 3.8.4.6.When the test is complete,carefully release the air pressure from all compartments by opening the air-supply valve. 3.8.2.BASE TANK'S PRIMARY(INTERNAL)TANK 3.8.2.1.Keep the tank vertical(the reservoir on top)at all times 3.8.4.7.When the air flow stops,remove the test manifolds. or the monitoring fluid may drain from the reservoir. 3.8.4.8.Check the monitoring-fluid level in the reservoir.It 3.8.2.2.Remove all temporary service-fitting plugs and the should be at approximately the same level as the pretest level. reservoir-fitting plug. 3.8.5.SECONDARY TANK(EXTERNAL) 3.8.2.3.Check the monitoring-fluid level in the reservoir.It 3.8.5.1.Check the exterior of the tank for monitoring fluid.(The should be about 1/4 full. monitoring fluid is dyed blue to distinguish between moisture and monitoring fluid.)If monitoring fluid is found,wipe the tank 3.8.2.4.Visually check the interior of each compartment for dry and verify that the monitoring fluid does not reappear.Lift monitoring fluid.There should not be any. the tank to check the bottom.Do not roll the tank. 9