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r <br />C <br />Lifting Lug 1 Typical Service Fitting <br />Typical Manway with Fittings \ ` Monitor Fitting When Double <br />Bulkhead Is Used <br />End Tank pffiTank End Tank <br />Bulkhead/ Flat <br />L Seam for Rib <br />Seam for Base Tank Seam for <br />End Tank End Tank <br />URR19.4i£ <br />FIGURE 3-7 <br />FIGURE 3-9 <br />3.5.2. AIR TEST OF BASE TANK <br />3.5.2.1. 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 3-7.) <br />3.5.2.2. Pressurize the base tank to 5 psig [3 psig for a 12 -foot <br />tank]. Allow the pressure to stabilize by adding or removing air <br />as necessary. <br />3.5.2.3. Close the air -supply valve on the test manifold in each <br />compartment. Disconnect the air -supply line. <br />C <br />3.5.2.4. Soap the entire exterior of the tank. Watch for active air <br />bubbles, which indicate a leak. Pay special attention to fitting and <br />manways. Lift the tank to check the bottom. Do not roll the tank. <br />3.5.2.5. Monitor the pressure for one hour. Do not release air <br />pressure. <br />3.5.3. AIR TEST OF END TANK(S) <br />3.5.3.1. 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 />3.5.3.2. Pressurize the end tank(s) to 5 psig [3 psig for a 12 -foot <br />tank]. Allow the pressure to stabilize by adding or removing air <br />as necessary. <br />3.5.3.3. Close the air -supply valve on the test manifold. <br />Disconnect the air -supply line. <br />3.5.4. EXTERNAL SOAP TEST <br />3.5.4.1. Soap the entire exterior of the tank. Watch for active air <br />bubbles, which indicate a leak. Pay special attention to fitting and <br />manways. Lift the tank to check the bottom. Do not roll the tank. <br />3.5.4.2. Monitor the pressure for one hour. <br />3.5.4.3. After the test is completed, release all tank air pressure <br />and remove gauges. <br />Do not connect air supply directly to the interstitial -space <br />monitor fitting. Pressurizing the secondary tank (interstitial <br />space) by itself may damage the primary tank or cause tank <br />failure. <br />3.6.1. GENERAL <br />3.6.1.1. 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 3-6 and FIGURE 3-7.) <br />3.6.2. AIR TEST OF BASE TANK <br />3.6.2.1. 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 3-7.) <br />3.6.2.2. Pressurize the base tank to 5 psig [3 psig for a 12 -foot <br />tank]. Allow the pressure to stabilize by adding or removing air <br />as necessary. <br />3.6.2.3. Close the air -supply valve on the test manifold in each <br />compartment. Disconnect the air -supply line. <br />3.6.2.4. Soap the entire exterior of the tank. Watch for active air <br />bubbles, which indicate a leak. <br />3.6.2.5. Monitor the pressure for one hour. Do not release air <br />pressure. <br />