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0 <br />3.6.3. AIR TEST OF END TANK(S) <br />3.6.3.1. Install the test manifold in the open service fitting. <br />Connect the pressure source to the test manifold on the end <br />tank(s). (See FIGURE 3-3 and FIGURE 3-8.) <br />3.6.3.2. Pressurize the end tank(s) to 5 psig [3 prig for a 12 -foot <br />tank]. Allow the pressure to stabilize by adding or removing air <br />as necessary. <br />3.6.3.3. Close the air -supply valve on the test manifold. <br />Disconnect the air -supply line. <br />3.6.3.4. Soap the entire exterior of the tank(s). Watch for active <br />air bubbles, which indicate a leak. <br />3.6.3.5. Monitor the pressure for one hour. <br />3.6.4. TEST OF DOUBLE BULKHEAD(S) <br />3.6.4.1. Install a 4 -inch NPT plug with a 0-15 psig gauge (1/4 -Ib. <br />or 1/10 -Ib. increments) into all monitor fittings leading to the <br />double bulkhead of the base -tank domes. (See FIGURE 3-9.) <br />3.6.4.2. Closely monitor all these gauges for any pressure <br />increase. <br />3.6.5. EXTERNAL SOAP TEST <br />3.6.5.1. Soap the entire exterior of the tank. Watch for active air <br />bubbles, which indicate a leak. Pay special attention to fittings and <br />manways. Lift the tank to check the bottom. Do not roll the tank. <br />3.6.5.2. Monitor all gauges for either a loss in pressure from the <br />tanks or an increase in pressure in the bulkhead interstitial space. <br />3.6.5.3. After the test is completed, release all tank air pressure <br />and remove gauges. <br />3.7. TESTING A DOUBLE-WALL MULTICOMPARTMENT <br />TANK WITH DRY INTERSTITIAL SPACE <br />I A CAUTION <br />Do not connect air supply directly to the interstitial -space <br />monitor fiifing. Pressurizing the secondary tank (interstitial <br />space) by itself may damage the primary tank or cause <br />tank failure. <br />3.7.1. GENERAL <br />3.7.1.1. Remove all temporary service fitting plugs, redope and <br />reinstall all fitting plugs except one in each compartment <br />(needed for test manifolds). Install permanent plugs in all <br />unused openings. (See FIGURE 3-10 and FIGURE 3-11.) <br />Lifting Lugl <br />Service Fitting <br />Typical Manway with Fittings <br />\ `Typical <br />Optional <br />/ <br />Monitor <br />Fitting <br />Reservoir <br />End Tank <br />Base Tank <br />End Tank <br />Seam for <br />Flat <br />Rib <br />Seam for-/ <br />Base Tank <br />` Seam for <br />End Tank <br />End Tank <br />FIGURE 3-10 <br />• <br />Air Test of Base Tank <br />• <br />FIGURE 3-11 <br />19111:111 V Vliip� <br />Air -Test Monitoring of Secondary Tank <br />• <br />FIGURE 3-13 <br />3.7.2. AIR TEST OF BASE TANK <br />3.7.2.1. Install the test manifold in the open service fitting. <br />Connect the pressure source to the test manifold on the base <br />tank. (See FIGURE 3-3 and FIGURE 3-11.) <br />3.7.2.2. Pressurize the base tank to 5 psig. Allow the pressure <br />to stabilize by adding or removing air as necessary. <br />3.7.2.3. Close the air -supply valve on the test manifold in each <br />compartment. Disconnect the air -supply line. <br />3.7.2.4. Soap all service fittings and manways. Watch for active <br />air bubbles, which indicate a leak. <br />3.7.2.5. Monitor the pressure for one hour. Do not release air <br />pressure. <br />3.7.3. AIR TEST OF END TANK(S) <br />3.7.3.1. Install the test manifold in the open service fitting. <br />Connect the pressure source to the test manifold on the end <br />tank(s). (See FIGURE 3-3 and FIGURE 3-12.) <br />3.7.3.2. Pressurize the end tank(s) to 5 psig. Allow the pressure <br />to stabilize by adding or removing air as necessary. <br />3.7.3.3. Close the air -supply valve on the test manifold. <br />Disconnect the air -supply line. <br />C7 <br />