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Determining Drop Tube Lengths <br /> Defender Spill Containment ( Ref. ) <br /> Top of Riser <br /> T <br /> O <br /> X « X „ To of Tank <br /> Upper Drop Tube <br /> 95 % Tank Volume <br /> Overfill Prevention Valve <br /> « A „ <br /> ( U . S . T. ) <br /> Lower « B " <br /> Drop Tube <br /> «Y" <br /> T <br /> CgT <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" N 52mm ) <br /> Figure 1 : Installation Overview and Drop Tube Calculation <br /> To find 95% Tank Volume and <br /> Measurement From Tank Chart To find Upper Drop Tube length "X To find Lower Drop Tube length "Y" <br /> Actual Tank CapaClty „A„ a Top of riser „ 95% Volume <br /> Gallons <br /> to bottom of ? " B ” �� height <br /> - tank - <br /> (Subtract) � (subtract) <br /> X OPV Length <br /> „ 95% Volume 153/4" (400 mm ) Offset <br /> „B <br /> height <br /> . 95 - (subtract) <br /> - (subtract) <br /> Position and6" ( 152mm ) Tank bottom <br /> [� Gallons ! 2'/2' (63 . 5 mm ) mounting clearance <br /> (95 % Tank Volume ) _ (equals ) adjustment = (equals ) <br /> 95 % Volume Height <br /> «Y„ <br /> BUpper Drop Tube Length Lower Drop Tube Length <br /> 4 <br />