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