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PRESSURE -TESTING SIDEBAR Single -Wall (or Primary) Tank 1. Pressurize the tank. 2. Check threaded orflanged joints for problems with the tank. 3. Soap the entire exterior of the tank (not applicable for a double-wall tank), including all service fittings and manways when present. 4. Hold and monitor the pressure fora minimum of 1 hour. 5. Carefully release the pressure from the tank. 6. Remove the test manifold and replace the protective covers in the service fittings. Wet Double -Wall Tank NOTICE Never pressurize a wet interstitial space. Doing so could result in damage to the primary tank and/or tank failure. 1. Check the level of the monitoring fluid in the reservoir. 2.Visually check the interiorand the exterior of each compartment for the presence of monitoring fluid. 3. If the monitoring fluid is not at the proper level, and/or monitoring fluid is found on either the interior or the exterior of any compartment, contact the manufacturing facility that shipped the tank. 4. If there is no monitoring fluid on either the interior or the exterior of any compartment, backfill the tank to the top of the tank. 5. After the tank is backfilled to the top of the tank, it may be pressure tested as in Single -Wall (or Primary)Tank steps 1-6. NOTE: For multicompartment tanks, follow these instructions to test each compartment. Dry Double -Wall Tank Not Under Vacuum 1. Test the primary tank as in Single -Wall (or Primary)Tank steps 1-4. 2. Use the quick -disconnect assembly to pressurize the interstitial space. 3. Soap the entire exterior of the tank. 4. Hold and monitor the pressure in the interstitial space fora minimum of 1 hour. 5. Carefully release the pressure from the primary tank. 6. Remove the test manifold and replace the protective covers in the service fittings. 7. After the tank is backfilled to the top of the tank, it may be pressure tested as in Single -Wall (or Primary)Tank steps 1-6. Dry Double -Wall Multicompartment Tank Not Under Vacuum 1. Install a test manifold in the base tank and in each end compartment. 2. Pressurize the base tank and the end compartment(s) as in a Single -Wall (or Primary)Tank steps 1-4. 3. Pressurize the interstitial space using the quick -disconnect assembly and follow instructions for Dry Double -Wall Tank Not UnderVacuum steps 3-6. 4. Afterthe tank is backfilled to the top of the tank, it may be pressure tested as in Single -Wall (or Primary)Tank steps 1.6. Dry Double -Wall Tank Under Vacuum Follow the pass/fail criteria shown in section 4.9.4 for double-wall tank shipped under vacuum to determine if preinstallation pressure testing is required. After the tank is backfilled to the top of the tank, it may be pressure tested as in Single -Wall (or Primary)Tank steps 1.6. NOTE: All UL- and ULC -label and potable water tanks must be pressure tested after backfill is brought close to the top of the tank. 19