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r -- <br />Determine drop tube lengths <br />Defender Spill Containment (Ref.) <br />Upper Drop Tube <br />7T1- g ? ��� �- <br />at surface of upper drop tube <br />r <br />«X>> Top of Tank <br />�— Final Shutoff Volume** <br />Overfill Prevention Valve <br />(U.S.T.) <br />Lower <br />Drop Tube <br />CIT7 <br />'11331 <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" (1 52mm) <br />Calculate final shutoff volume <br />Actual Tank Capacity <br />i' �-8 Z <br />Gallons <br />X (Multiply) <br />f/Z- <br />C7.gK'4j <br />Typically 95%** <br />Final shutoff volume <br />_ (Subtract) <br />i 8}y3-yY <br />(gallons) <br />i os 74s = B <br />Final Shutoff Volume Height <br />6 <br />To find Upper Drop Tube length "X" <br />"A" <br />r, <br />Drop tube seat <br />volume height <br />f/Z- <br />surface to <br />- (subtract) <br />bottom of tank <br />_ (Subtract) <br />Z <br />„g„ <br />r� <br />Final shutoff <br />volume height <br />- (subtract) <br />2'/2" (63.5 mm) <br />Position and <br />mounting <br />adjustment <br />_ (equals) <br />Upper Drop Tube Length <br />"A„ <br />To find Lower Drop Tube length "Y" <br />r 1.1 <br />,71 <br />Final <br />B„ ID5 e <br />volume height <br />- (subtract) <br />153/4" (400 mm) <br />OPV Length <br />offset <br />- (subtract) <br />Tank bottom <br />Z <br />clearance <br />_ (equals) <br />Y„ 81-t 5%'f <br />Lower Drop Tube Len9l <br />