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Measure & record " A" and " Z, " and then peform the following calculation : <br /> " A" 153 " Drop tube seal surface to the bottom of the tank <br /> - ( subtract ) <br /> " Z " 042 " Upper drop tube flange to the edge of the upper tube adapter <br /> - ( subtract ) <br /> 4 , 5 " Reference offset <br /> _ ( equals ) <br /> 5 " Final shutoff volume height <br /> Locate the final shutoff volume <br /> height on the tank chart <br /> Use the tank chart provided by the tank provided by the tank <br /> manufacturer to record and calculate the following : manufacturer, and record the <br /> n A closest corresponding volume . <br /> gal Final shutoff volume <br /> ( divide by) <br /> ` Gj2 } gal Actual tank capacity <br /> X ( muliply by ) <br /> 100 <br /> > = ( equals ) If the final shutoff volume <br /> p I oQ percentage is 95% or less, the <br /> U I u I I I % Final shutoff volume percentage installation conforms to FFS and <br /> industry recommended practices . <br /> gal Actual tank capacity <br /> - ( subtract) The final Shutoff Volume Percentage may <br /> be greater than 95% as long as the ullage <br /> G7 � gal Final shutoff volume volume remaining is greater than or <br /> _ ( equals ) equal to 250 gallons, so that " . . . none of <br /> the fittings located on the top of the tank <br /> gall Ullage volume remaining are exposed to product due to <br /> overfilling, " according to EPA 40 CFR Part <br /> 280. The installation must also meet all <br /> applicable regulatory requirements, and <br /> must be acceptable to the Authority <br /> Having Jurisdiction (AHJ ) . <br />