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C <br /> r Tank 3 91 <br /> Determine drop tube lengths <br /> Defender Spill Containment{Ref.} <br /> Seat surface of upper drop tube <br /> x„ Tap of Tank <br /> Upper Drop Tube <br /> t � <br /> Final Shutoff Volume" <br /> I <br /> Overfill Prevention Valve <br /> (U.S.T.) <br /> Lower �rB„ <br /> Drop Tube <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 /> off <br /> 19,951 "A surface to volume height <br /> Gallons 171.75 "B" 107.25 <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) <br /> OPV Length <br /> 95 Typically "B" 107.25 Final shutoff 15%"(400 mm) Offset <br /> YP Y 95e/n�'" <br /> tbtrac- <br /> volume Height <br /> - (subtract) <br /> — (su <br /> Final shutoff volume Position and} 6"(152mm) Tank bottom <br /> 18,954 (gallons) 2'/z"(63.5 mm} mounting clearance <br /> =(equals) adjustment _ (equals) <br /> 107.25 = B "X" 63.00 "Y" 85.50 <br /> Final Shutoff Volume Height upper Drop Tube Length Lower Gro Tube Length <br /> Note for the"X"measurement:We add 1 inch to the upper drop tube measurement lowering the final shut-off to 106.25(94.5%) <br /> 6 <br /> n <br />