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Tank# T2 87B <br />Determine drop tube lengths <br />Defender Spill Containment (Ref.) <br />Seat surface of upper drop tube <br />96V Top of Tank <br />Upper Drop Tube -Ir <br />Final Shutoff Volume** <br />Overfill Prevention Valve <br />(U.S.T.) <br />Lowe r <br />Drop Tube <br />11 Y55 <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 <br />Gallons <br />X (Multiply) <br />- (Subtract) <br />94% <br />Typically 95%** <br />18,750 <br />Final shutoff volume <br />volume height <br />- (subtract) <br />(gallons) <br />105 5/8" = B <br />Final Shutoff Volume Height <br />To find Upper Drop Tube length "X" <br />"A" 159" <br />Drop tube seat <br />surface to <br />bottom of tank <br />- (Subtract) <br />"B" 105 5/8" " <br />Final shutoff <br />volume height <br />- (subtract) <br />Position and <br />2'/z" (63.5 mm) <br />mounting <br />_ (equals) <br />adjustment <br />«X» 50 7/8" <br />Upper Drop Tube Length <br />"A" <br />To find Lower Drop Tube length "Y" <br />Final <br />ff <br />„volume height <br />«B„ <br />- (subtract) <br />OPV Length <br />153/4' (400 mm) Offset <br />- (subtract) <br />6" (152mm) Tank bottom <br />clearance <br />_ (equals) <br />IIY59 <br />Lower Drop Tube Length <br />