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T \ <br /> Determine drop tube lengths <br /> Defender Spill Contain ant(Ref.) <br /> Seat surface of upper drop tube <br /> 0 <br /> X., „X„ Top of Tank <br /> Upper Drop Tube <br /> Final Shutoff Volume" <br /> Overfill Prevention Valve <br /> „A„ <br /> (U.S-T.) <br /> Lower «B„ <br /> Drop Tube <br /> i/VA <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 /> 9 " / .Z n Finalshutoft <br /> Gallons "A" surface to "B" volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) <br /> OPV Length <br /> Typically 95%** „B„ 5 " Final shutoff 15'/,"(400 mm) Offset <br /> b <br /> (sutract) volume height <br /> - (subtract) <br /> 1 <br /> — -Final shutoff volume Position and 6"(152mm) Tank bohom <br /> (gallons) 2%i'(63.5 mm)I mounting clearance <br /> _(equals) adjustment _(equals) <br /> 1-74 2 B 9 , <br /> S <br /> Final Shutoff Volume Height �— Upper Drop Tube Leath tower Drop Tube Lenm <br />