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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 /> -- 1 — 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 /> it Drop tube seat <br /> 11 <br /> I --51 <br /> Final shutoff <br /> Gallons "A" surface to "B" volume height <br /> bottom of tank <br /> Subtract OPV Length <br /> X (Multiply) - (Subtract) - (subtract) <br /> Final shutoff 15%"(400 mm) Offset <br /> (subtract) <br /> .95 Typically 95%** "B" �� volume height <br /> - (subtract) <br /> — - <br /> Final shutoff volume Position and 6"(152mm) Tank bottom <br /> (gallons) 1 <br /> 21/2'(63.5 mm) mounting I clearance <br /> =(equals) adjustment =(equals) <br /> B «X„ Y <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tube Len th <br /> 6 <br />