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r-. <br />Determine drop tube lengths <br />Defender Spill Contai <br />Tank# T2 -87B <br />Upper Drop Tube <br />(Ref.) <br />Seat surface of upper drop tube <br />«X» Top of Tank <br />Final Shutoff Volume' <br />Overfill Prevention Valve <br />(U.S.T.) <br />Lower <br />Drop Tube <br />r1Y„ <br />«B„ <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 <br />19,951 Gallons <br />X (Multiply) <br />94% Typically 95%** <br />18 750 Final shutoff volume <br />(gallons) <br />105 5/8" = B <br />Final Shutoff Volume Height <br />6 <br />N. <br />To find Upper Drop Tube length "X" <br />"A" <br />105 5/8" �� <br />Drop tube seat <br />159" <br />surface to <br />- (subtract) <br />bottom of tank <br />- (Subtract) <br />OPV Length <br />"B" <br />105 5/8" " <br />Final shutoff <br />- (subtract) <br />volume height <br />- (subtract) <br />6" (152mm) <br />clearance <br />Position and <br />2'/z" (63.5 mm) <br />mounting <br />Lower Drop Tube Length <br />adjustment <br />_ (equals) <br />X„ 50 3/8" <br />Upper Drop Tube Length <br />«A» <br />To find Lower Drop Tube length "Y" <br />«B„ <br />105 5/8" �� <br />volume height <br />- (subtract) <br />OPV Length <br />153/4' (400 mm) <br />Offset <br />- (subtract) <br />Tank bottom <br />6" (152mm) <br />clearance <br />_ (equals) <br />Y„ 83 7/8" <br />Lower Drop Tube Length <br />