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Determine drop tube lengths <br /> Defender Spill Containment <br /> 9 <br /> * 17 <br /> Seat surface of upper drop tube <br /> 0 <br /> "X" If 11 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 /> « Y , <br /> slyll <br /> 1 <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 /> Gallons "A" surface to Final shutoff j <br /> bottom of tank <br /> volume height { <br /> X (Multiply) - (Subtract) - (subtract) OPV length <br /> 95 <br /> Typically 9590** „ gr. Final shutoff 15'/x' (400 mm ) offset <br /> Yp Y volume height <br /> 00,0040 subtract 111 (subtract) i <br /> Final shutoff volume <br /> (subtract ) Position and Tank bottom <br /> ( 152mm ) <br /> (gallons ) 2 %' ( 63 . 5 mm ) mountingIIIIII clearance <br /> _ (equals) adjustment = (equals) <br /> _ 14YII <br /> X» <br /> Final Shutoff Volume Height Upper Drop Tube Length Laxer Drop Tubo Length <br /> � s <br />