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NOTE:During freezing conditions,a suitable solution such NOTICE as windshield washer fluid may be added to the soap and water mixture. Never allow the pressure in the interstitial space to be greater than the pressure in a primary tank. Failure to follow 3.7.2.When doing a soap test, rotate the tank to check the this notice may result in damage to a primary tank and/or bottom. Do not rotate a tank filled with monitoring fluid. tank failure. 3.7.2.1. Before rotating the tank, place protective material on ® WARNING the area on which the tank will be rotated. Make sure the area Never remove the service-fitting plugs when there is pres- is flat and free of large or sharp objects,such as rocks,which sure in the tank. Failure to follow this warning could result in may damage the tank. - death or serious injury. 3.7.2.2. Rotate the tank slowly and carefully to avoid develop- 3.9.4. Remove the test manifolds and replace the protective ing too much momentum. Momentum can grow because covers in the service fittings. manways and fittings on top of the tank make it top heavy. Make sure the tank's fittings and manways never touch the 4., PREINSTALLATION TESTING FOR ground. Do not rotate the tank more than 120 degrees from SPECIFIC TYPES OF AIR-TESTABLE TANKS the initial starting point. NOTE:When air testing a tank,follow the procedures out- 3.7.3. If damage is detected,contact the plant from which the lined here for the specific type of tank being installed. For tank was shipped. more specific details on these procedures,see the SECTION NOTE:Do not attempt unauthorized repairs. 3 SECTIONS to which you are referred. 3.8. PERFORMING VISUAL CHECKS ON A TANK 4.1. AIR TESTING A SINGLE-WALL TANK WITH A WET INTERSTITIAL SPACE 4.1.1. Prepare the tank for air testing.See SECTION 3.4. NOTICE 4.1.2. Pressurize the tank.See SECTION 3.5. Never pressurize a wet interstitial space.Doing so may 4.1.3.Soap the entire exterior of the tank.See SECTION 3.7. damage the primary tank or cause tank failure. 4.1.4. Hold and monitor the pressure for a minimum of 1 hour. NOTICE 4.1.5. Carefully release the air pressure from the tank.See Never rotate a tank filled with monitoring fluid.Doing so SECTION 3.9. may result in damage to the tank and/or tank failure. 4,1.6. Remove the test manifold and replace the protective 3.8.1. Check that the tank has monitoring fluid in the reservoir. covers in the service fittings. Measure the level of the monitoring fluid in the reservoir. 4.2. TESTING A WET DOUBLE-WALL TANK NOTE:If the reservoir is less than a third full,contact the plant from which the tank was shipped.See the back cover NOTICE of the Installation Manual for contact numbers. Never pressurize a wet interstitial space. Doing so may re- 3.8.2.Visually check the interior of the tank for monitoring sult in damage to the primary tank and/or tank failure. fluid.There should not be any. 4.2.1.Check the level of the monitoring fluid in the reservoir. See SECTION 3.8.for instructions. 3.8.2.1.When checking a multicompartment tank,inspect the interior of each compartment for monitoring fluid. 4.2.2.Usually check the interior and the exterior of each com- partment for the presence of monitoring fluid.See SECTION 3.8.3.Visually check the exterior of the tank for monitoring 3.8.for instructions. fluid.(The monitoring fluid is dyed blue to distinguish between moisture and monitoring fluid.)If monitoring fluid is found,wipe 4.2.3.If the monitoring fluid is not at the proper level,and/or moni- the tank dry and verify that the monitoring fluid does not reap- toring fluid is found on either the interior or the exterior of any pear.Lift the tank to check the bottom. Do not roll the tank. compartment,contact the plant from which the tank was shipped. 3.8.3.1.When checking a multicompartment tank, inspect the 4.2.4.If there is no monitoring fluid on either the interior or the exterior of each compartment for monitoring fluid. exterior of any compartment, proceed to backfill the tank to 3.9. RELEASING PRESSURE FROM THE TANK the top of the tank. 3.9.1. If there is an interstitial space to pressurize, open the 4.2.5.After the tank is backfilled to the top of the tank,it must valve of the test manifold and carefully release the air pressure be air tested.See SECTION 13 for instructions. in the interstitial space first. 4.3.TESTING A DRY-MONITOR, DOUBLE-WALLTANK 3.9.2. If the tank is a multicompartment tank,carefully release WITH THE INTERSTITIAL SPACE UNDER VACUUM the air pressure in the end compartments first. 4.3.1.A dry-monitor,double-wall tank may be shipped from the factory with the interstitial space under vacuum.This op- 3.9.3.Then carefully release the air pressure from the base tank. tion allows for monitoring the tank during shipping and han- dling, and may expedite tank installation by shortening 6