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