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Determine drop tube lengths <br /> Defender Spill Containment(Ref.) <br /> Seat surface of upper drop tube <br /> 0 <br /> p <br /> Upper Drop Tube o of Tank <br /> Final Shutoff Volume" <br /> i ' <br /> J <br /> Overfill Prevention Valve <br /> (U.S.T.) <br /> Lower <br /> Drop Tube <br /> csVr, <br /> s�Y" <br /> 6" (152 mm) Max* <br /> Bottom of Tank Not to sale <br /> * If local codes require this distance to be smaller, <br /> subtract less than 6"N52mm) <br /> Calculate final shutoff volume <br /> Actual Tank Capacity To find Upper Drop Tube length "X" To find Lower Drop Tube length "Y" <br /> Drop tube seat n Final shutoff <br /> Gallons "A" �' surface to g" <br /> bottom of tank volume height <br /> X (Multiply) - (Subtract) - (subtract) <br /> OPV Length <br /> 95 Typically 95% Final shutoff 15'/a" (400 mm} Offset <br /> _ volume height <br /> Final shutoff volume - (subtract) - (subtract) <br /> 911 l ] 7 (gallons) 2'/z" (63.5 mm) PosIon and 6" (152mm) Tank bottom <br /> mounting clearance <br /> (equals) adjustment = (equals) <br /> B ,sX„ s4s 11Y„ <br /> Final Shutoff Volume Height upper DropTube Lenoth Lower DrupTube Length <br /> 6 <br />