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3.5. TESTING A SINGLE-WALL MULTICOMPARTMENT TANK WITH A SINGLE-WALL BULKHEAD 3.5.1. GENERAL 3.5.1.1. Remove all temporary service -fitting plugs. 3.5.1.2. 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 3-6 and FIGURE 3-7.) 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 SECTION 3.5.3.), install the test manifolds on the base and end tank(s). L fling Lug Typical Service Filbrg Monitor Fitting Types Manway with Fiftings When Double -Wall Is Used End Tank Mfkhead End Tank Bulkhead �� '� \_ Flat Seam for `'�� `- R Seam for J Base Tank ` Seam for End Tank End Tank FIGURE 3-6 Air Test of Base Tank FIGURE 3-7 FIGURE 3-8 3.5.2. AIR TEST OF BASE TANK 3.5.2.1. Connect the pressure source to the test manifold on the base tank. (See FIGURE 3-3 and FIGURE 3-7.) 3.5.2.2. Pressurize the base tank to 5 psig [3 psig for a 12 -foot - diameter tank]. Allow the pressure to stabilize by adding or removing air as necessary. 3.5.2.3. Close the air -supply valve on the test manifold in each compartment. Disconnect the air -supply line. 3.5.2.4. Monitor the pressure for one hour. Do not release air pressure. 11 3.5.3. AIR TEST OF END TANK(S) 3.5.3.1. Connect the pressure source to the test manifold on the end tank(s). (See FIGURE 3-3 and FIGURE 3-8.) 3.5.3.2. 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. 3.5.3.3. Close the air -supply valve on the test manifold. Disconnect the air -supply line. 3.5.4. EXTERNAL SOAP TEST 3.5.4.1. 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. 3.5.4.2. Monitor the pressure for one hour. 3.5.4.3. After the test is completed, release all tank air pressure and remove gauges. 3.5.4.4. Replace the protective covers in the service fittings. 3.6. TESTING A SINGLE-WALL MULTICOMPARTMENT TANK WITH DOUBLE-WALL BULKHEAD(S) 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. 3.6.1. GENERAL 3.6.1.1. Remove all temporary service -fitting plugs. 3.6.1.2. Redope fittings and install plugs in all openings, except one service fitting in each compartment (needed for the test manifolds). Follow instructions in Point 3.1.5. (See FIGURE 3-6 and FIGURE 3-7.) 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 3.6.2.1. Connect the pressure source to the test manifold on the base tank. (See FIGURE 3-3 and FIGURE 3-7.) 3.6.2.2. Pressurize the base tank to 5 psig [3 psig for a 12 -foot - diameter tank]. Allow the pressure to stabilize by adding or removing air as necessary. 3.6.2.3. Close the air -supply valve on the test manifold on the base tank. Disconnect the air -supply line. 3.6.2.4. Soap the fittings on top of the base tank to make sure fittings are not leaking. Watch for active air bubbles, which indicate a leak. 3.6.2.5. Monitor the pressure for one hour. Do not release air pressure.