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r-. <br />Determine drop tube lengths <br />Defender Spill Contai <br />Tank# T5-91 <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 />LLQ/„ <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 />39,854 Gallons <br />X (Multiply) <br />94% Typically 95%** <br />445 Final shutoff volume <br />37 <br />(gallons) <br />106" = B <br />Final Shutoff Volume Height <br />6 <br />N. <br />To find Upper Drop Tube length "X" <br />"A" <br />106" �� <br />Drop tube seat <br />134 1/2" <br />surface to <br />- (subtract) <br />bottom of tank <br />- (Subtract) <br />OPV Length <br />LLB" <br />106" " <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„ 26" <br />Upper Drop Tube Length <br />«A» <br />To find Lower Drop Tube length "Y" <br />"B <br />106" �� <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„ 84 1/4" <br />Lower Drop Tube Length <br />