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Tank# 5 91 <br /> Determine drop tube lengths <br /> Defender Spill Containment(Ref.) <br /> Seat surface of upper drop tube <br /> 0 <br /> «X„ <br /> 96V Top of Tank <br /> i Upper Drop Tube <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 /> " "B" 104 7/8" 11]Final volume height <br /> 11,849 Gallons "A" 166" surface to <br /> ff <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) <br /> OPV Length <br /> .95 Typically 95%** "B" 61 1/8" Final shutoff 153/a" (400 mm) Offset <br /> Final shutoff volume - (subtract) volume height - (subtract) Tank bottom <br /> 11 255 Position and 6" (152mm) clearance <br /> (gallons) 2'/z"(63.5 mm) mounting <br /> =(equals) adjustment = (equals) <br /> 104 7/8" = B x, 58 5/8" "Y" 83 1/8" <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tube Length <br /> 6 <br />