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Determine drop tube lengths <br /> Defender Spill Containment ( Ref) <br /> Seat surface of upper drop tube <br /> rrX Top of Tank <br /> Upper Drop Tube �- <br /> 1 <br /> �- Final Shutoff Volume * * <br /> Overfill Prevention Valve � <br /> I � <br /> ( U . S . T. ) <br /> Lower — erg " <br /> Drop Tube <br /> ( <br /> 11 � <br /> „ Y ,r <br /> 6 " ( 152 mm ) Max* f <br /> Not to Scale <br /> Bottom of Tank t <br /> * If local codes require this distance to be smaller, - ' <br /> subtract less than 6" ( 152mm1 <br /> Calculate final shutoff volume <br /> To find Upper Drop Tube length " X" To find Lower Drop Tube length " Y " <br /> Actual Tank Capacity ora tube seat <br /> ii P u Final shutoff <br /> Gallons " A " surface to " B volume height <br /> bottom of tank <br /> X ( Multiply ) - (Subtract ) - (subtract) <br /> OPV Length <br /> 95 T icall 95 %* * „ g „ Final shutoff 153/4' (400 mm ) offset <br /> YP y volume height <br /> _ - (subtract ) <br /> Final shutoff volume - (subtract } rank bottom <br /> Position and 6° ( 152mm ) clearance � <br /> (gallons ) 2 /z' (63 . 5 mm ) mounting <br /> _ (equals ) adtustme"t = ( equals ) <br /> Final Shutoff Volume Height Upper Drop TabO Lengrh Lader Drop Tube Lenylh <br /> 6 <br />