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A WARNING Interior Dimensions Tank Diameter If product is used as ballast,exercise special care in URE handling.Safeguard against sparks,fire or product spills. 1 in FIGURE 4' 6' 8' 10' 12' Improper handling of product could cause a fire or explo- sion and result in death or serious injury. "A" 491/4" 73" 92" 121" 1381/4" A WARNING "B" 541/2" 78" 98" 126" 1431/4" "C" 48" 713/8" 913/16" 119 3/16" 136 5/8" The tank shall be adequately vented to prevent the development of vacuum or pressure when filling or "D" 491/2" 72 314" 91 112" 120" emptying the tank.Failure to properly vent the tank could "E" 55" 77 3/4" 971/4" 125 314" cause tank failure and result in death or serious injury. '71 48" 70 5/8" 90 5/8" 118112" 10.1.GENERAL "G" 511/2" 751/8" 953/8" 1231/2" 10.1.1.In most anchoring systems,a tank is not adequately protected "H'9 56 5/8" 801/4" 1001/2" 128 5/8" against flotation until the tank is fully backfilled and the top slab is in I„ 48" 713/8" 913/16" 1193/16- place.Therefore,during the installation process,the tank should be ballasted completely after the backfill is even with the top of the tank and postinstallation testing has been successfully completed. TABLE 11-1 10.1.2.Only under wet-hole conditions should ballast be added 11.2.EXTERNAL PIPING before the backfill is even with the top of the tank.(See SECTION 8.) 1 A WARNING When pressure testing the external piping,the tank must be 11. PIPING ANDVENTING isolated from all piping. The test pressures for external piping 11.1.INTERNAL PIPING could cause tank failure and result in death or serious injury. 11.1.1.All piping must conform to all applicable codes and standards. (See SECTION 1.) CAUTION CAUTION When extending monitoring or vapor-recovery piping to the surface,make sure the at-grade fittings are different from All internal piping must be at least 4 inches[6 inches for any fill fittings and will not accept standard fill hoses. 12-foot-diameter tanks]from the tank bottom.Failure to do this may damage the tank or surrounding property. 11.3.VENTING TANK CAUTION A WARNING All metal fittings and other metal components must be coated All underground tanks/compartments shall be adequately to protect against corrosion.Failure to do this may result in vented to prevent the development of vacuum or pressure damage to these parts or to surrounding property. when filling or emptying the tank.Failure to properly vent a tank or compartment could cause tank failure and result in 11.1.2.Refer to FIGURE 11-1 along with TABLE 11-1 to death or serious injury. determine the correct dimensions for sizing internal piping. 11.3.1.The single-wall tank is designed to operate at atmos- � e 8 e " pheric pressure. ASD —G ^ Dimension Line Dimension Line 11.3.2. In the double-wall and triple-wall tank,the primary tank is Single-Wall&Double-Wall II Double-Wall I designed to operate at atmospheric pressure. 11.3.3.The tank's venting system must be adequately sized to A a JE JG ensure that atmospheric pressure is maintained at all times, including during filling and emptying of tank. Single-Wall Double-Wall 11 Double-Wall 1 11.3.4.Whenever installing overfill protection,such as alarms, Ribbed Outer Wall Smooth Outer Wall Note: automatic shut-off devices("flapper valves")or vent-restriction 1. All fitting dimensions are measured from the top of a devices("ball-float valves"),follow the instructions provided by service fitting to the inside bottom of the tank and include the manufacturer of the overfill-protection device and consult the gauge-plate clearance. 2. Interior diameters do not include gauge-plate clearance. authority having Jurisdiction to determine the level at which the overfill protection should operate. FIGURE 11-1 18