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3.5.TESTING A SINGLE-WALL MULTICOMPARTMENT TANK 3.5.3.AIR TEST OF END TANK(S) WITH A SINGLE-WALL BULKHEAD 3.5.3.1.Connect the pressure source to the test manifold on the 3.5.1.GENERAL end tank(s).(See FIGURE 3-3 and FIGURE 3-8.) 3.5.1.1.Remove all temporary service-fitting plugs. 3.5.3.2.Pressurize the end tank(s)to 5 psig[3 psig for a 3.5.1.2.Redope fittings and install plugs in all openings,except 12-foot-diameter tank].Allow the pressure to stabilize by adding one service fitting in each compartment(needed for the test or removing air as necessary. manifolds).Follow instructions in Point 3.1.5. (See FIGURE 3-6 and FIGURE 3-7.) 3.5.3.3.Close the air-supply valve on the test manifold. Disconnect the air-supply line. 3.5.1.3.Before doing the air test of the base tank(described in SECTION 3.5.2.)and the air test of the end tank(s)(described in 3.5.4.EXTERNAL SOAP TEST SECTION 3.5.3.),install the test manifolds on the base and end 3.5.4.1.Soap the entire exterior of the tank,checking for leaks. tank(s). (Follow instructions in Points 3.1.6.through 3.1.8.,including Warnings following 3.1.8.)Watch for active air bubbles,which indicate a leak.Pay special attention to fittings and manways. Lifting Lug_. Typical Service Fitting Monitor Fitting Typical Manway with Fillings' When Double-Wall 3.5.4.2.Monitor the pressure for one hour. i Bulkhead Is Used 3.5.4.3.After the test is completed,release all tank air pressure ( End Tank Base Tank End Tank and remove gauges. 3.5.4.4.Replace the protective covers in the service fittings. Bulkhead \ Flat Seam for nib 3.6.TESTING A SINGLE-WALL MULTICOMPARTMENT TANK Seam for Base Tank Seam for End Tank End Tank WITH DOUBLE-WALL BULKHEAD(S) FIGURE 3-6 CAUTION Air Test of Base Tank Do not connect air supply directly to the interstitial-space monitor fitting.Pressurizing the secondary tank(interstitial e s e e e space)by itself may damage the primary tank or cause tank failure. 3.6.1.GENERAL 3.6.1.1.Remove all temporary service-fitting plugs. 3.6.1.2.Redope fittings and install plugs in all openings,except FIGURE 3-7 one service fitting in each compartment(needed for the test manifolds).Follow instructions in Point 3.1.5. (See FIGURE 3-6 Air Test of End Tank(s) and FIGURE 3-7.) s e e o 3.6.1.3.Before doing the air test of the base tank(described in ' SECTION 3.6.2.)and the air test of the end tank(s)(described in SECTION 3.6.3.),install the test manifolds on the base and end tank(s). 3.6.2.AIR TEST OF BASE TANK FIGURE 3-8 3.6.2.1.Connect the pressure source to the test manifold on the base tank.(See FIGURE 3-3 and FIGURE 3-7.) 3.5.2.AIR TEST OF BASE TANK 3.6.2.2.Pressurize the base tank to 5 psig[3 psig for a 12-foot- 3.5.2.1.Connect the pressure source to the test manifold on the diameter tank].Allow the pressure to stabilize by adding or base tank.(See FIGURE 3-3 and FIGURE 3-7.) removing air as necessary. 3.5.2.2.Pressurize the base tank to 5 psig[3 psig for a 12-foot- 3.6.2.3.Close the air-supply valve on the test manifold on the diameter tank].Allow the pressure to stabilize by adding or base tank.Disconnect the air-supply line. removing air as necessary. 3.5.2.3.Close the air-supply valve on the test manifold in each 3.6.2.4.Soap the fittings on top of the base tank to make sure fittings compartment.Disconnect the air-supply line. are not leaking.Watch for active air bubbles,which indicate a leak. 3.5.2.4.Monitor the pressure for one hour.Do not release air 3.6.2.5.Monitor the pressure for one hour.Do not release air pressure. pressure. 7