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NOTE:Do not attempt unauthorized repairs. on inters nal~ 3.6. PRESSURIZING THE INTERSTITIAL SPACE test manifold IN A DRY TANK �air-supply valve air-pressure gauge air-pressure gauge 0 WARNING pressun-relief Never lift or hoist a tank under pressure.Failure to follow device this warning could result in death or serious injury. FIGURE 3-2 NOTE:Do not attempt unauthorized repairs. NOTE:All compartments on a double-wall tank may be man- 3.6.1.Tanks with a dry interstitial space not shipped under vac- ifolded together and tested simultaneously,or each com- uum come with a quick-disconnect assembly.See FIGURE 3-3. partment may be tested separately. 3.4.3.2.A test manifold is needed for testing the dry interstitial - — space of an air-testable,double-wall tank.See FIGURE 3-2. Nylon tie NOTE:A test manifold is not required for a tank with an in- j terstice filled with monitoring fluid. -' 3.4.4.During air tests,ambient air temperature can affect pressure-gauge readings. Monitoring access Quick-disconnect fitting assembly Q CAUTION II Allow for pressure variations when tanks are subject to abrupt temperature changes.Failure to follow this caution may result in minor or moderate injury. FIGURE 3-3 3.4.5.When testing tanks with wet monitoring,remove the 3.6.2.If the tank is not configured as shown in FIGURE 3-3 reservoir-fitting plug. prior to preinstallation testing,contact the plant from which 3.4.6.If the tank has threaded fittings,it Is the installer's re- the tank was shipped. sponsibility to select a thread sealant that is compatible with 3.6.3.The quick-disconnect assembly must not be connected the product being stored.Some sealants cannot be used with to the service fitting when air testing the primary tank.Keep some stored products. the nylon tie in place. 3.4.7.Install permanent plugs in all openings where piping will 3.6.4. Maintain the pressure in the primary tank. not be installed. 3.4.8.Make sure all manway bolts are tightened,and fitting CAUTION plugs are property doped and sealed. Do not connect the air supply directly to the interstitial- space monitoring access fitting.Pressurizing the secondary 3.4.8.1.The tank may be air tested with the factory-supplied tank(interstitial space)by itself may damage the primary temporary plugs.Redope and tighten temporary plugs if tank or cause tank failure. needed. 3.6.5.Free the hose from the service fitting by cutting the 3.4.9.Keep one service fitting open in each compartment for nylon tie. the test manifold. 3.6.6.Insert the hose into the quick-disconnect fitting.This will 3.4.10.Tanks equipped with flanged nozzles may require con- allow air to transfer from the primary tank to the interstitial space. tractor-supplied blind flanges for preinstallation air testing. 3.6.7. Reconnect the air-supply line.Allow the pressure to sta- 3.5. PRESSURIZING THE PRIMARY TANK bilize at 5 psig(3 psig for 12-foot-diameter tanks)by adding or 3.5.1.Install the test manifold in the open service fitting and con- removing air as necessary. nect the pressure source to the test manifold.See FIGURE 3-3. 3.6.8.Close the air-supply valve on the test manifold and dis- 3.5.2.If the interstitial space is dry, install the test manifold connect the air-supply line. and close the valve before pressurizing the primary tank. 3.7. SOAPING THE TANK 3.53.Open the air-supply valve and pressurize the primary tank 3.7.1.After pressurizing the tank,soap the tank to check the to 5 psig(3 psig for 12-foot-diameter tanks).Allow a few min- tank's integrity. utes for the air temperature in the tank to stabilize,then allow 3.7.1.1.Soap either the fittings,manways and covers or the the pressure to stabilize by adding or removing air as necessary. entire exterior of the tank,depending on what part of the test- 3.5.4.Hold and monitor the pressure for a minimum of 1 hour. ing process the tester is at and what kind of tank is being air tested.See SECTION 4 instructions for specific types of tanks. 3.5.4.1.If the test manifold shows a pressure build-up in the interstitial space of a dry-monitor,double-wall tank,contact 3.7.1.2.Watch for active air bubbles.There should not be any. the plant from which the tank was shipped. 5