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DSL <br /> Determine drop tube lengths <br /> Defender Spill Containment(Ref.) <br /> Seat surface of upper drop tube <br /> 0 <br /> „X„ <br /> «X„ <br /> Upper Drop Tube Top of Tank <br /> Final Shutoff Volume" <br /> Overfill Prevention Valve/ <br /> «A„ <br /> (U.S.T.) <br /> Lower «B„ <br /> Drop Tube <br /> «Y„ <br /> rr1 „ <br /> Y <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 /> Actual Tank Capacity Drop tube seat <br /> n n Final shutoff <br /> 10389 Gallons "A" 174 surface to "B" 100.5 volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) OPV Length <br /> Final shutoff 153/4' (400 mm) offset <br /> Xx .92 Typically 95%** "B" 100.5 volume height <br /> _ - (subtract) <br /> - <br /> Final shutoff volume (subtract) Position and Tank bottom <br /> 9557 6"(152mm) clearance <br /> (gallons) 2'/z"(63.5 mm) mounting <br /> _ (equals) adjustment = (equals) <br /> 100.5 = B „X„ 71 °Y" 79.75 <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tube Length <br /> 6 ;; <br />