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Tank# T2 87B <br /> Determine drop tube lengths <br /> Defender Spill Containment(Ref.) <br /> 2P <br /> Seat surface of upper drop tube <br /> 0 <br /> Top of Tank <br /> Upper Drop Tube /� <br /> - + Final Shutoff Volume"* <br /> Overfill Prevention Valve <br /> "A„ <br /> (U.S.T.) <br /> Lower <br /> Drop Tube <br /> «Y„ <br /> «1 „ <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 /> " <br /> 19,951 Gallons "A" 159" surface to «g„ "I Final <br /> volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) <br /> OPV Length <br /> 94% Typically 95%** °°B" 105 5/8" Final shutoff 153%a" (400 mm) Offset <br /> volume height - (subtract) <br /> Final shutoff volume - (subtract) Tank bottom <br /> 18,750 Position and 6" (152mm) clearance <br /> (gallons) 2'/z"(63.5 mm) mounting <br /> =(equals) adjustment = (equals) <br /> 105 5/8" = B x, 50 7/8" <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tube Length <br /> 6 r-. <br />