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4.6.2.When doing a soap test,rotate the tank to check the bottom. 4.8. RELEASING PRESSURE FROM THE TANK Do not rotate a tank filled with monitoring fluid. 4.8.1. If there is an interstitial space to pressurize,open the valve NOTE: Before rotating the tank,place protective material of the interstitial test manifold and carefully release the pressure on the area on which the tank will be rotated.Make sure the in the interstitial space first. area is flat and free of large or sharp objects,such as rocks, 4.8.2.If the tank is a multicompartment tank,carefully release the which may damage the tank. pressure in the end compartments first. 4.6.3.Rotate the tank slowly and carefully to avoid developing 4.8.3.Then carefully release the pressure from the base tank. too much momentum.Momentum can grow because manways and fittings on top of the tank make it top heavy. NOTICE NOTE:Make sure the tank's fittings and manways never touch Never allow the pressure in the interstitial space to be greater than the ground.Do not rotate the tank more than 120 degrees from the pressure in a primary tank.Failure to follow this notice could the initial starting point. result in damage to a primary tank and/or tank failure. 4.6.4.If damage is detected,contact the manufacturing facility that A WARNING shipped the tank. Never remove the service-fitting plugs when there is pressure in the tank.Failure to follow this warning could result in death NOTE: Do not attempt unauthorized repairs. or serious injury. 4.7. PERFORMING VISUAL CHECKS ON 4.8.4.Remove the test manifolds and replace the protective covers ATAN K WITH A WET INTERSTITIAL SPACE in the service fittings. NOTICE 4.9.TESTING FOR SPECIFIC TYPES Never pressurize a wet interstitial space.Doing so could result in OF PRESSURE-TESTABLE TANKS damage to the tank and/or tank failure. NOTE: When pressure testing a tank,follow the procedures NOTICE outlined in Pressure-Testing Sidebar for the specific type of tank Never rotate a tank filled with monitoring fluid.Doing so could being installed. result in damage to the tank and/or tank failure. 4.9.1.GENERAL 4.7.1.Check that the tank has monitoring fluid in the reservoir. 4.9.1.1.Prepare the tank for pressure testing in the following way: Measure the level of the monitoring fluid in the reservoir and record on checklist. • assemble items needed for testing,including compressor, soap/water solution,brush,sprayer,test manifold and pressure lines NOTE: If the reservoir is less than 1/3 full,contact the manu- • set the tank in an area where the tank can be safely manipulated facturing facility that shipped the tank.See the back cover of the and observed without risking property damage or injury Installation Manual for contact numbers. • install the test manifold(s) 4.7.2.Visually check both the interior and the exterior of the tank • clean service fittings and plugs,and apply pipe thread sealant for monitoring fluid.(The monitoring fluid is dyed blue to distinguish • install gaskets,blinds and flange bolting between moisture and monitoring fluid.)There should not be any. • seal service fittings,nozzles and other openings • Visually check the interior of the tank. • clean surfaces as required o check each compartment of a multicompartment tank 4.9.2. PRESSURE TESTING A SINGLE-WALL TANK • Visually check the exterior of the tank. check the exterior of each compartment of a multicompartment tank 4.9.2.1. See Pressure Testing Sidebar for instructions. if monitoring fluid is found,wipe the tank dry and verify that the 4.9.3.TESTING A WET DOUBLE-WALL TANK monitoring fluid does not reappear lift the tankto check the bottom—do not roll the tank NOTICE Never pressurize a wet interstitial space.Doing so could NOTE:Tanks are shipped with a pop-off valve to ensure that excess result in damage to the primary tank and/or tank failure. pressure does not build in the interstitial space during shipping and/or storage.Conditions such as excess heat can cause this valve to release. 4.9.3.1. See Pressure-Testing Sidebar for instructions. If the tank is rotated and the ambient temperature is much higher than 4.9.4.TESTING A DRY-MONITOR, when it was shipped,the pop-off valve will relieve the pressure,which DOUBLE-WALL TAN KWITH THE may result in monitoring f luid on the tan k surface.If this occurs,wipe INTERSTITIAL SPACE UNDER VACUUM the tank dry and verify that the monitoring fluid does not reappear. NOTE: Adry-monitor,double-wall tank may be shipped from NOTE: If there is still monitoring fluid present on the tank after the factory with the interstitial space under vacuum.This option completing this process,contact the manufacturing facility that allows for monitoring the tank during shipping and handling, shipped the tank. and may expedite tank installation by shortening preinstallation testing procedures.The date that the vacuum was applied is on a label near the monitor or on the shipping documentation delivered with the tank. 18