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3.6.3. AIR TEST OF END TANK(S) 3.6.3.1. Connect the pressure source to the test manifold(s) on the end tank(s). (See FIGURE 3-3 and FIGURE 3-8.) 3.6.3.2. Pressurize the end tank(s) to 5 psig [3 psig for a 12 -foot -diameter tank]. Allow the pressure to stabilize by adding or removing air as necessary. 3.6.3.3. Close the air -supply valve on the test manifold. Disconnect the air -supply line. 3.6.4. TEST OF DOUBLE-WALL BULKHEAD(S) 3.6.4.1. After the primary and secondary tanks have been pressurized, install a 4 -inch NPT plug with a 0-15 psig gauge (1/4 -Ib. or 1/10 -Ib. increments) into all monitor fittings leading into the double-wall bulkhead(s). (See FIGURE 3-9.) FIGURE 3-9 3.6.5. EXTERNAL SOAP TEST 3.6.5.1. Soap the entire exterior of the tank, checking for leaks. (Follow instructions in Points 3.1.6. through 3.1.8., including Wamings following 3.1.8.) Watch for active air bubbles, which indicate a leak. Pay special attention to fittings and manways. 3.6.5.2. Monitor the pressure for one hour. 3.6.5.3. Monitor all gauges for either a loss in pressure from the tanks or an increase in pressure in the bulkhead interstitial space. 3.6.5.4. After the test is completed, release all tank air pressure and remove gauges. 3.6.5.5. Replace the protective covers in the service fittings. 3.7. TESTING A DOUBLE-WALL MULTICOMPARTMENT TANK WITH A DRY INTERSTITIAL SPACE CAUTION Do not connect air supply directly to the interstitial -space monitor fitting. Pressurizing the secondary tank (interstitial space) by itself may damage the primary tank or cause tank failure. 3.7.1. GENERAL 3.7.1.1. Remove all temporary service -fitting plugs. 3.7.1.2. Redope fittings and install plugs in all openings, except one service fitting in each compartment (needed for the test manifolds). Follow instructions in Point 3.1.5. (See FIGURE 3-10 and FIGURE 3-11.) 3.7.1.3. The tank will arrive with a quick -disconnect assembly. (See FIGURE 3-4.) c; 3.7.1.4. If the tank is not configured as shown in FIGURE 3-4 prior to preinstallation testing, call the UST coordinator at the Xerxes plant nearest you. Lifting Lug l Typical Serves Fitting Typical Manway with F tt ngs MF�rtor Optional ing Reservoir End Tank i i Base Tank I End Tank Flat L Seam for Rib Seam for Base Tank Seam for End Tank End Tank FIGURE 3-10 Air Test of Base Tank 00 FIGURE 3-11 Air Test of End Tank(s) + ®o s CE( FIGURE 3-12 Air -Test Monitoring of Secondary Tank FIGURE 3-13 3.7.2. AIR TEST OF BASE TANK 3.7.2.1. Connect the pressure source to the test manifold on the base tank. (See FIGURE 3-3 and FIGURE 3-11.) 3.7.2.2. Pressurize the base tank to 5 psig. Allow the pressure to stabilize by adding or removing air as necessary. 3.7.2.3. Close the air -supply valve on the test manifold on the base tank. Disconnect the air -supply line. 3.7.2.4. Soap all service fittings and manways on the base tank. Watch for active air bubbles, which indicate a leak.