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7-3: D IeSe l <br />Determine drop tube lengths <br />Defender Spill Containment (Ref.) <br />Calculate final shutoff volume <br />Upper Drop Tube <br />Overfill Prevention Valve <br />Lower — <br />Drop Tube <br />Seat surface of upper drop tube <br /><<X=� Top of Tank <br />Final Shutoff Volume" <br />WA <br />(U.S.T.) <br />418), <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" 052mm) <br />Actual Tank Capacity <br />fL,) Z -4 I <br />Gallons <br />X (Multiply) <br />OPV Length <br />onset <br />d.qq-15- <br />Typically 45%** <br />r <br />Final shutoff volume <br />clearance <br />(gallons) <br />/8 = B <br />U6 ,7 <br />Final Shutoff Volume Height <br />'x 6 <br />To find Upper Drop Tube length "X' <br />F, Drop tube seat <br />"A" + } b 36 surface to <br />bottom of tank <br />- (Subtract) <br />Final shutoff <br />volume height <br />(subtract) <br />Position and <br />2%" (63.5 mm) mounting <br />(equals) adjustment <br />_ <br />Upper Drop Tube Lerglh <br />Vs1% <br />To find lower Drop Tube length "Y" <br />/ O/�� n <br />Final shutoff <br />volume height <br />- (subtract) <br />{400 mm) <br />OPV Length <br />onset <br />- (subtract) <br />,. <br />Tank bottom <br />clearance <br />_ (equals) <br />Y" <br />Lower Drorroop Tube Length <br />