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r preinstallation testing procedures.The date that the vacuum 4.4.9. Remove the test manifold and replace the protective G, was applied is on a label by the monitor or on the shipping covers in the service fittings. L documentation delivered with the tank. 4.5.AIRTESTING A DRY-MONITOR, DOUBLE-WALL 4.3.1.1.This date may be used as a reference under this pro- MULTICOMPARTMENTTANK NOT UNDER VACUUM cedure to evaluate the tank's integrity prior to installation,and _ to validate Xerxes'obligations under the limited warranty. NOTICE 4.3.1.2.Xerxes tanks shipped under vacuum must be under Do not connect air supply directly to the interstitial-space monitoring access fitting.Pressurizing the interstitial space vacuum for a minimum of 7 days. If this requirement is not met, by itself may result in damage to the primary tank and/or an air/soap test is required.See SECTION 4.4.for instructions. tank failure. 4.3.1.3.The tank shipped under vacuum should be installed 4.5.1. Prepare the tank for air testing.See SECTION 3.4. and backfilled with the vacuum intact if both of the following _ two conditions are met: 4.5.1.1.Install a test manifold in each compartment,that is,in the base tank and each end compartment.See FIGURE4-1. - 4.3.1.3.1. installation of the tank is to begin 7 days or more afterthe factory application of vacuum(as indicated on the shipping documents and/or tank labels) Typical Lifting Optional reservoir man ay lug Typical Monitoring access - 4.3.1.3.2,the vacuum gauge shipped with the tank reads 12 (wet interstitial space) With fittings service fitting ftfing(dry 9 9 PP \ � interstitial space) inches of mercury or more. Pressure- relief valve NOTE:Under certain field conditions(such as major for shipping changes in temperature,barometric pressure and/or alti- End Base tank End Compartment Compartment tude)and/or with certain equipment failure(such as freezing or sticking of gauge mechanism),the vacuum-monitoring / \ Flat method may not be an accurate enough test.When in j Seam for base tank doubt,or when such conditions occur,Xerxes recommends seam for end compartment Seam for end compartment SECTION 4.4. or 4.5.(whichever is applicable)as the pre- ferred preinstallation test procedure. FIGURE 4-1 4.3.1.4.After the tank is backfilled to the top of the tank,the 4.5.2. Pressurize the primary tank of the base tank.See SEC- tank must be air tested.See SECTION 13 for instructions. TION 3.5 and FIGURE 4-2. 4.3.1.5. If either or both of the conditions stated in POINTS 4.3.1.3.1. and 4.3.1.3.2. are not met,follow the procedures of Air Test of Primary Tank SECTION 4.4. or 4.5. (whichever is applicable)for the prein- stallation test. 4.3.1.5.1. If the gauge reads less than 12 inches of mercury, perform a visual inspection of the exterior of the tank and the vacuum gauge fittings to evaluate the tank's integrity,and contact the plant from which the tank was shipped. FIGURE 4-2 NOTE: Do not attempt unauthorized repairs. 4.5.3. Pressurize the end compartment(s).See SECTION 3.5. 4.3.1.6. Record the vacuum gauge reading at the time of in- and FIGURE 4-3. stallation on the Tank Installation Checklist. 4.4.AIRTESTINGADRY-MONITDR,DOUBLE-WALLTANK Air Test of End Compartment(s) 4.4.1.Prepare the tank for air testing.See SECTION 3.4, y 4.4.2. Pressurize the primary tank.See SECTION 3.5. 4.4.3.Soap all service fittings and manways.See SECTION 3.7. 4.4.4.Hold and monitor the pressure in the primary tank for a minimum of 1 hour. FIGURE 4-3 4.4.5. Use the quick disconnect assembly to pressurize the in- 4.5.4.Soap all service fittings, manways and covers.See terstitial space.See SECTION 3.6. SECTION 3.7. 4.4.6.Soap the entire exterior of the tank.See SECTION 3.7. 4.5.5. Hold and monitor the pressure for a minimum of 1 hour. 4.4.7. Hold and monitor the pressure in the interstitial space 4.5.6.Use the quick-disconnect assembly to pressurize the in- for a minimum of 1 hour. terstitial space.See SECTION 3.6.and FIGURE 4-4. 4.4.8.Carefully release the air pressure from the tank.See SECTION 3.9. 7