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Tanks with Manways Dimensions for FIGURE I4-2 <br /> Tank Dia. G H I _ <br /> Single-wall and Double-wall 4' 48° 511/4" 551/4" <br /> C&F 6' 713/8" 743/4" 783/4" <br /> B&E g' 911/4" 941/2" 981/2" <br /> Single-wall Double-wall 10' 91/4" 221/2" 1261/2" <br /> 12' 1365/8" 140" 144" <br /> TABLE I4-2 <br /> OTaDE 14.2. EXTERNAL PIPING <br /> WARNING <br /> The tank must be isolated from all piping when the external <br /> piping is being pressure tested.The test pressures for exter- <br /> NOTES: nal piping could cause tank failure,and could result in death <br /> 1.All fitting dimensions are measured from the top of a or serious injury. <br /> service fitting to the inside bottom of the tank and include <br /> striker-plate clearance. NOTICE <br /> 2.Interior diameters do not include striker-plate clearance. When extending monitoring or vapor-recovery piping to the sur- <br /> face,make sure the at-grade fittings are different from any fill <br /> FIGURE 14-1 fittings and will not accept standard fill hoses.Failure to do this <br /> may result in damage to the tank and/or surrounding property. <br /> Dimensions for FIGURE 14-1 NOTICE <br /> Tank All connections to the tank must be flexible. Provisions must <br /> Dia. A B C D E F be made to accommodate movement and misalignment be- <br /> 4' 48" 4912' 541/2, 48" 491/2" 541/2, tween the piping and the tank. Failure to do this may result <br /> in damage to the tank and/or surrounding properly. <br /> 6' 713/8" 73" 78" 703/4" 7212" 773/4" <br /> 8' 91114" 93• 98" 9o° 913/4" 97" 14.3. VENTING TANKS t <br /> 10' 1191/4" 121" 126" 118" 1193/4" 125" ® WARNING <br /> 12' 1365/8" 1381/4^ 1431/4" --- --- -- All underground tanks/compartments shall be adequately <br /> TABLE 14-1 vented to prevent the development of vacuum or pressure <br /> when filling or emptying the tank. Failure to properly vent a <br /> 14.1.3. For tanks equipped with access openings,refer to FIG- _ <br /> tank or compartment could cause tank failure,and could re- <br /> URE 14-2 along with TABLE 14-2 to determine the correct di- suit in death or serious injury. <br /> mensions for sizing internal piping. <br /> 14.3.1.The single-wall tank is designed to operate at atmos- <br /> pheric pressure. <br /> Tanks with Access Openings <br /> 14.3.2.In the double-wall and triple-wall tanks,the primary <br /> tank is designed to operate at atmospheric pressure. <br /> 14.3.3.The tank's venting system must be adequately sized to <br /> ensure that atmospheric pressure is maintained at all times, in- <br /> cluding during filling and emptying of tank. <br /> 14.3.4.Whenever installing overfill protection, such as an <br /> alarm,an automatic shut-off device(flapper valve)or a vent- <br /> restriction device(ball-float valve),follow the instructions pro- <br /> vided by the manufacturer of the overfill-protection device and <br /> OGH consult the authority having jurisdiction to determine the level <br /> at which the overfill protection should operate. <br /> 14.3.4.1.Some jurisdictions do not allow ball-float valves. _ <br /> Consult applicable codes and regulations. <br /> G- internal diameter of the tank <br /> H- distance between the inside bottom of the AWARNING <br /> tank and the internal flange of the access riser <br /> I- distance between the inside bottom of Vent-restriction devices for overfill should not be installed if <br /> the tank and the top of the access opening owner/operator will allow pump-or pressure-filling of tank. <br /> Failure to follow this warning could cause tank failure,and <br /> FIGURE 14-2 could result in death or serious injury. <br /> 21 <br />