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3.1.11.After installation and before backfilling to grade,testing must 3.2.5.Close the air-supply valve on the test manifold.Disconnect be repeated to verify that no damage has occurred during installation. the air-supply line. WARNING 3.2.6.Soap the entire exterior of the tank,checking for leaks. When the tank is under pressure,the manways and/or (Follow instructions in Points 3.1.6.through 3.1.8.,including fittings may dislodge,or the tank could rupture and result Warnings following 3.1.8.)Watch for active air bubbles,which in death or serious injury.Before beginning the test,notify indicate a leak.Pay special attention to fittings and manways. all people on the test site to remain in a safe location. ALWAYS ATTEND TO THE TANK DURING THE TEST.Stand 3.2.7.Monitor the pressure for one hour. clear of manways,fittings and tank ends during the test. 3.2.8.When the test is complete,carefully release the air pressure from the tank by opening the air-supply valve. WARNING The maximum testressure is 5 sig[3 psig fora 12-foot- 3.2.9.When airflow stops,remove the test manifold. p p diameter tank].Position the pressure gauge so that the pressure 3.2.10. Replace the protective covers in the service fittings. readings can be clearly read at all times.Failure to follow this waming could result in death or serious injury.(See FIGURE 3-2.) 3.3.TESTING A DOUBLE-WALL TANK WITH A DRY INTERSTITIAL SPACE IIIII— = I 3.3.1.GENERAL IIIII I I= III 3.3.1.1.The tank will arrive with a quick-disconnect assembly. I II (See FIGURE 3-4.) I=11 eMs,9 11= II I II I IIIIIII 3.3.1.2. If the tank is not configured as shown in FIGURE 3-4 III= prior to preinstallation testing,call the UST coordinator at the Xerxes plant nearest you. IIIII —1 3.3.2.PRIMARY TANK(INTERNAL) FIGURE 3-2 3.3.2.1.Remove all temporary service-fitting plugs. 3.3.2.2.Redope fittings and install plugs in all openings,except A WARNING one service fitting(needed for the test manifold).Follow The pressure-relief device or regulated air source must be instructions in Point 3.1.5. rated at a maximum of 6 psig[4 psig for a 12-foot-diameter tank]to reduce the risk of overpressurizing the tank.Failure 3.3.2.3.Install the test manifold in the open service fitting.Connect to follow this warning could result in death or serious injury. the pressure source to the test manifold.(See FIGURE 3-4.) 3.2.TESTING A SINGLE-WALL TANK ----------- 3.2.1.Remove all temporary service-fitting plugs. — : Tie a 3.2.2.Redope fittings and install plugs in all openings,except one service fitting(needed for the test manifold).Follow instructions in Point 3.1.5. Quick-Dmirrlect Assembly 3.2.3.Install the test manifold in the open service fitting.Connect Monitor Fitting the pressure source to the test manifold.(See FIGURE 3-3.) - Air-Supply Valve Al,-Supply Air-Supply Gauge�.O O��Gauge FIGURE 3-4 Pressure-Relief Device 3.3.2.4.In order to test the primary tank alone,the quick- disconnect assembly must not be connected to the service fitting—keep the nylon tie in place. 3.3.2.5.Pressurize the primary tank to 5 psig[3 psig for a 12- foot-diameter tank].Allow the pressure to stabilize by adding or FIGURE 3 3 removing air as necessary. 3.2.4.Pressurize the tank to 5 psig[3 psig for a 12-foot-diameter 3.3.2.6.Close the air-supply valve on the test manifold. tank].Allow the pressure to stabilize by adding or removing air Disconnect the air-supply line. as necessary. 5