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Determine drop tube lengths <br />Defender Spill Containment (Ref.) <br />7' Z - 91 <br />Seat surface of upper drop tube <br />rrye� Top of Tank <br />Upper Drop Tubs? /1 <br />r Final Shutoff Volume** <br />Overfill Prevention Valve-' <br />(U.S.T.) <br />Lower <br />Drop Tube <br />"Y„ <br />6" (152 mm) Max* <br />' Bottom of Tank <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 <br />j lot, <br />Gallons <br />X (Multiply) <br />W p <br />,q q 15 <br />Typically 95%** <br />- (subtract) <br />Final shutoff volume <br />OPV Length <br />offset <br />1 Z 79. R <br />(gallons) <br />/a5 B <br />Final Shutoff Volume Height <br />r <br />To find Upper Drop Tube length `rX' <br />Drop tube seat <br />"A" l 3�i surface to <br />bottom of tank <br />- (Subtract) <br />,B <br />„B„ <br />/ 3/� ++ <br />Final shutoff <br />W p <br />volume height <br />volume height <br />- (subtract) <br />15'/" (400 mm) <br />OPV Length <br />offset <br />Position and <br />2'/z" (63.5 mm) <br />mounting <br />_ (equals) <br />adjustment <br />1XI :.7 p '4 <br />xv <br />Lower Drop Tube Length <br />Upper Drop Tube Length <br />"A" <br />WN <br />Not to Scale <br />To find Lower Drop Tube length "Y" <br />,B <br />�/p u <br />Final shutoff <br />W p <br />volume height <br />- (subtract) <br />15'/" (400 mm) <br />OPV Length <br />offset <br />- (subtract) <br />+ „ <br />Tank bottom <br />J VL <br />clearance <br />_ (equals) <br />Lower Drop Tube Length <br />