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f:yJ <br /> Determine drop tube lengths <br /> Defender Spill Contain ent(Ref.) <br /> Seat surface of upper drop tube <br /> o <br /> Upper Drop Tube_ Top of Tank <br /> Final Shutoff Volume" <br /> Overfill Prevention Valve <br /> T1 <br /> {tw <br /> (U.S.T.) 11 <br /> Lower "B" <br /> Drop Tube <br /> ..Y„ l <br /> ` I <br /> _ I <br /> 1 � l <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 /> To find Upper Drop Tube length"X"' To find Lower Drop Tube length"Y" <br /> ActualTank <br /> � city Drop tube seat <br /> „ Final shutoff <br /> Gallons <br /> "A" I L� surface to "B" volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) OP Length I <br /> -J� Typically 95%-- „B„ Final shutoff 15'/:'(400 mm) onset <br /> i _J volume height _ (subtract) <br /> (gshutoff volume subtract <br /> all <br /> (subtract) <br /> Position and �I 6"(152mm) Tank bottom <br /> (gallons) 21/2-(63.5 mm) mounting I clearance <br /> adjustment <br /> _(equals) _(equals) <br /> _ B „X„ <br /> Final Shutoff Volume Height Upper Drop ube Length i tower DMO Tube Larath <br /> 6 <br />