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c <br /> DETERMINE DROP TUBE LENGTHS <br /> Defender Spill Containment(Ref.) <br /> Seat surface of upper drop tube <br /> 0 <br /> «X„ To of Tank <br /> Upper Drop Tube X p <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 /> To find Upper Drop Tube length"X" To find Lower Drop Tube length"Y" <br /> Actual Tank Capacity Drop tube seat -Til Final <br /> ff <br /> Gallons "A" " surface to g' volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) <br /> OPV Length <br /> 95 Typically 95%** g» Final shutoff 15Y4"(400 mm) Offset <br /> volume height _ (Subtract) <br /> (subtract) <br /> Final shutoff volume Position and6"(152mm) Tank bottom <br /> (gallons) 2'/2'(63.5 mm) mounting clearance <br /> =(equals) adjustment =(equals) <br /> = B X„ "Y„ <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tube Length <br /> u <br /> 6 �. { <br /> r1 _ <br />