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Determine drop tube lengths <br /> Defender Spill Containment(Ref.) <br /> Seat surface of upper drop tube <br /> 0 <br /> «X„ «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 /> 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 /> Actual Tank Capacity To find Upper Drop Tube length "X" To find Lower Drop Tube length "Y" <br /> A" �� Drop tube seat Final shutoff <br /> " <br /> 6,016 Gallons 134 `B 8411 volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) <br /> OPV Length <br /> 93 Typically 95%** "B" 84�� Final shutoff 15%" (400 mm) Offset <br /> volume height <br /> _ - (subtract) - (subtract) <br /> 5 594 Final shutoff volume Position and 5" (152mm) Tank bottom <br /> (gallons) 21W'(63.5 mm) mounting clearance <br /> adjustment <br /> _ (equals) _ (equals) <br /> 84" = B 11X„ 47.5" "Y" 63.25 <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tube Length <br /> 6 <br /> Wits'�- <br />