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o� <br /> Determine drop tube lengths <br /> Defender Spill Containment (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 /> "All <br /> N . S .T. ) / 1 <br /> Lower <br /> " 6 " <br /> Drop Tube <br /> Idyll <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 /> I <br /> Calculate final shutoff volume g <br /> To find Upper Drop Tube length ' To find Lower DropTube length "Y" <br /> Actual Tank Capacity Drop tube seat <br /> � <br /> Gallons "A" a surface to « g » 1, Final shutoff� � volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) <br /> OPV Length <br /> . 95 Typically 95%** «g » Final shutoff 153/4" (400 mm ) Offset <br /> Yp Y volume height _ (subtract) <br /> (subtract) Tank bottom <br /> Final shutoff volume 6" ( 152mm ) <br /> I n (gallons ) <br /> Position and <br /> i ( 1 %- I, • " aIIOnS 2'/z" (63 . 5 mm ) mounting j clearance <br /> _ (equals) adjustment = (equals) <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tuhe Length <br /> Lc - <br /> 4 6 C <br />