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Tanks with Manways aimensionsfor FIGURE 14-2 Tank Dia. G H I Single-wall and Double-wall 4' 48' 511/4' 551/4' C&F 6. 7139' 7434' 783/4' —7777� B&E 8' 911/4' 9412' 9812' 10' 1191/4' 12212' 12612' Single-wall Double-wall 1r 136 5W 140 144' TABLE 14-2 aAB D E F 14.2. EXTERNAL PIPING 0 WARNING The tank must be isolated from all piping when the external piping is being pressure tested.The test pressures for exter- NOTES: nal piping could cause tank failure,and could result in death 1.All fitting dimensions are measured from the top of a or serious injury. service fitting to the inside bottom of the tank and include CAUTION striker-plate clearance. 2.interior diameters do not inlucde striker-plate clearance. When extending monitoring or vapor-recovery piping to the sur- face,make sure the at-grade fittings are different from any fill FIGURE 14-1 fittings and will not accept standard fill hoses.Failure to do this may result in damage to the tank and/or surrounding property. Dimensions for FIGURE 14-1 1CAUTION TankA B C D E F All connections to the tank must be flexible.Provisions must Dia. be made to accommodate movement and misalignment be- 4' 48' 4912' 6412' 48• 4912' 5412• tween the piping and the tank.Failure to do this may result in damage to the tank and/or surrounding property. 6' 7139' 73' 78' 703/4' 7212' 773/4' e' 911/4• M. 98• 90• 91314' 97• 14.3. VENTING TANKS 10' 1191/4' 121' 12V 118' 1193/4' 126' Q WARNING 12' 1 13859' 1381/4• 1431/4• — -- — All underground tanks/compartments shall be adequately TABLE 14-1 vented to prevent the development of vacuum or pressure with access openings,)afar to FIG- when filling or emptying the tank.Failure to property vent a 14.1.3.For tanks equippedtank or compartment could cause tank failure,and could re- URE 14-2 along with TABLE 14-2 to determine the correct di- suit in death or serious injury. mensions for sizing internal piping. 14.3.1.The single-wall tank is designed to operate at atmos- pheric pressure. Tanks with Access Openings 14.3.2.In the double-wall and triple-wall tanks,the primary 7" tank is designed to operate at atmospheric pressure. 14.3.3.The tank's venting system must be adequately sized to ensure that atmospheric pressure is maintained at all times,in- cluding during filling and emptying of tank. 14.3.4.Whenever installing overfill protection,such as an alarm,an automatic shut-off device(flapper valve)or a vent- restriction device(ball-float valve),follow the instructions pro- vided by the manufacturer of the overfill-protection device and aG .Hl consult the authority having jurisdiction to determine the level at which the overfill protection should operate. 14.3.4.1. Some jurisdictions do not allow ball-float valves. Consult applicable codes and regulations. G- internal diameter of the tank H- distance between the Inside bottom of the 0 WARNING tank and the internal flange of the access riser I- distance between the Inside bottom of Vent-restriction devices for overfill should not be installed if the tank and the top of the access opening owner/operator will allow pump-or pressure-filling of tank. Failure to follow this warning could cause tank failure,and FIGURE 14-2 could result in death or serious injury. 21