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E <br />AWARNING <br />Do not use air pressure to test tanks that contain or have <br />contained flammable or combustible liquids or vapors. The <br />fuel and air mixture could explode and cause death, serious <br />personal injury or property damage. Tanks should be air <br />tested before ballasting. <br />AWARNING <br />If product is used as ballast, exercise special care in handling. <br />Safeguard against sparks, fire or product spills. Improper <br />handling of product could cause a fire or explosion, and <br />death, serious personal injury or property damage. <br />9.1. GENERAL <br />9.1.1. After backfill is brought to the top of the tank, make an <br />intermediate measurement of vertical deflection according to the <br />instructions in SECTION 14. <br />9.1.2. After the tank has been measured and vertical deflection <br />is determined to be within the limits specified by Xerxes, the <br />tank must be pressure tested to ensure that no damage <br />occurred during installation. <br />9.1.3. Follow the procedure in SECTION 3, soaping all exposed <br />areas of the tank and all fittings, and monitoring the pressure <br />for one hour. <br />9.1.4. Carefully relieve the pressure in the tank. Remove the <br />quick -disconnect assembly from dry double-wall tanks. <br />1 <br />Do not use air pressure to test tanks that contain or have <br />contained flammable or combustible liquids or vapors, and <br />do not perform any postinstallation pressure tests. The fuel <br />and air mixture could explode and cause death, serious <br />personal injury or property damage. Tanks should be air <br />tested before ballasting. <br />When ballasting the tank, make sure the tank is property <br />vented. The vent must be large enough to allow the <br />displaced air to escape. Failure to properly vent the tank <br />may cause tank damage. <br />1 <br />If product is used as ballast, exercise special rare in handling. <br />Safeguard against sparks, fire or product spills. Improper <br />handling of product could cause a fire or explosion, and <br />death, serious personal injury or property damage. <br />17 <br />10.1. GENERAL <br />10.1.1. In most anchoring systems, a tank is not adequately <br />protected against flotation until the tank is fully backfilled and <br />the top slab is in place. Therefore, during the installation <br />process, the tank should be ballasted completely after the <br />backfill is even with the top of the tank and postinstallation <br />testing has been successfully completed. <br />10.1.2.Only under wet -hole conditions should ballast be added <br />before the backfill is even with the top of the tank. (See <br />SECTION 8.) <br />1C, <br />When filling the tank, make sure the tank is properly <br />vented. The vent must be large enough to allow the <br />displaced air to escape. <br />11.1. INTERNAL PIPING <br />11.1.1. All piping must conform to all applicable codes and <br />standards. (See SECTION 1.) <br />1 <br />All intemal piping must be at least 4 inches [6 inches <br />for 12 -foot -diameter tanks] from the tank bottom. <br />All metal fittings and other metal components must be <br />coated to protect against corrosion. <br />11.1.2. Refer to FIGURE 11-1 along with TABLE 11-1 to <br />determine the correct dimensions for sizing internal piping. <br />B & E <br />^ ^ ®-A&D <br />Dimension Line <br />Single -Wall & Double -Wall II <br />H <br />G <br />Dimension Line <br />Double -Wall I <br />Single -Wall Double -Wall 11 Double-WallI <br />Ribbed Outer Wall Smooth Outer Wall <br />Note: <br />1. All fitting dimensions are measured from the top of a <br />service fitting to the inside bottom of the tank and include <br />gauge -plate clearance. <br />2. Interior diameters do not include gauge -plate clearance. <br />C <br />