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Determine drop tube lengths <br /> Defender Spill Containment ( Ref. ) <br /> a a 0 0 all <br /> Seat surface of upper drop tube <br /> 0 <br /> "X„ Top of Tank <br /> Upper Drop Tube <br /> - Final Shutoff Volume" <br /> Overfill Prevention Valve <br /> „A„ <br /> ( U . S . T. ) <br /> Lower « B „ <br /> Drop Tube <br /> «Y„ <br /> 6 " ( 152 mm ) Max* <br /> Bottom of Tank Not to Scale <br /> * If local codes require this distance to be smaller, <br /> subtract less than 6" ( 152mm ) <br /> Calculate final shutoff volume <br /> To find Upper Drop Tube length "X" To find Lower Drop Tube length "Y" <br /> Actual Tank Capacity <br /> If Drop tube seat ' , Final shutoff <br /> Gallons "A„ surface to B volume height <br /> bottom of tank <br /> X ( Multiply) - (Subtract) - (subtract) OPV Length <br /> Final shutff95 Typically 95 %** " B" volume height 153/" (400 mm ) offset <br /> - (subtract) <br /> Final shutoff volume - (subtract) Tank bottom <br /> Position and 6" ( 152mm ) clearance <br /> (gallons ) 21/2" (63 . 5 mm ) mounting <br /> = (equals) adjustment = (equals) <br /> � — <br /> B r,X„ iYYJ <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tube Length <br /> ftiiic <br /> C " <br />