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,- o � � <br /> c � � r <br /> �S e a <br /> Determine drop tube lengths <br /> Defender Spill Containment (Ref. ) <br /> Seat surface of upper drop tube <br /> 0 <br /> «X„ <br /> «X„ Top of Tank <br /> Upper Drop Tube <br /> -� Final Shutoff Volume" <br /> Overfill Prevention Valve <br /> „A„ <br /> ( U6S .T. ) <br /> Lower " B „ <br /> Drop Tube slyll <br /> 6" ( 152 mm ) Max* <br /> Bottom of Tank <br /> 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 ii <br /> Final shutoff <br /> Gallons "A" " surface to (1 <br /> i) �o I ,, bottom of tank B C1 volume height <br /> X (Multiply) - (Subtract) - (subtract) OPV Length <br /> o „ n Final shutoff 153/," (400 mm) Offset <br /> .95 Typically 95%** B � ) > ! ) volume height <br /> - (subtract) <br /> Final shutoff volume Position and 6" (152mn <br /> (subtract) Tank bottom <br /> (gallons ) 2 '/z' (63 . 5 mm ) mounting I clearance <br /> _ (equals) adjustment = (equals) <br /> « „ / 2 <br /> Final Shutoff Volume Height Upper Drop Tube Length Lower Drop Tube Len th <br /> 6 <br /> I <br />