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