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C <br />Tank 3 91 <br />Determine drop tube lengths <br />Defender Spill Containment {Ref.} <br />Upper Drop Tube <br />Seat surface of upper drop tube <br />irxrr Tap of Tank <br />Final Shutoff Volume" <br />Overfill Preverftion Valve-' <br />(U.S.T. ) <br />Lowe r <br />Drop Tube <br />�rYrr <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 />29,816 <br />Gallons <br />X (Multiply) <br />To find Lower Drop Tube <br />95 <br />Typically 95%** <br />Drop tube seat <br />surface to <br />Final shutoff volume <br />Final shutoff <br />height <br />28,325 <br />(gallons) <br />107.50 = B <br />Final Shutoff Volume Height <br />g'Arr <br />To find Upper Drop Tube length "X" <br />To find Lower Drop Tube <br />length "Y" <br />"A" 187.75 <br />Drop tube seat <br />surface to <br />n <br />"B" 107.50 <br />Final shutoff <br />height <br />bottom of tank <br />volume <br />- (Subtract) <br />- (subtract) <br />"B" <br />1 107.50Final <br />shutoff <br />1 15%" (400 mm} <br />OPV Length <br />offset <br />volume height <br />_ (subtract) <br />- (subtract)Tank <br />2'/V (63.5 mm) <br />Position and <br />mounting <br />6" (152mm) <br />I <br />bottom <br />clearance <br />_ (equals) <br />adjustment <br />_ (equals) <br />-x, 78.75 <br />Y" 85.75 <br />Upper Drop Tube Length <br />Lower Drop Tube Length <br />