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Determining Drop Tube Lengths <br /> Defender Spill Containment(Ref.) <br /> Top of Riser <br /> 0 <br /> «X,�X p Upper Drop Tube O of Tank <br /> 95% Tank Volume <br /> Overfill Prevention Valve <br /> 6f A H <br /> (U.S.T.) M <br /> Lower «B» <br /> Drop Tube <br /> 1 <br /> T <br /> „Yrr <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 /> 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 Capacity A„ Top of riser - - -- „ 95%Volume <br /> Gallons - to bottom of B height <br /> tank ! � <br /> (Subtract) - (subtract) oPV Length <br /> X 95%Volume 153/a" (400 mm) Offset g <br /> B height <br /> 95 i - (subtract) <br /> (subtract) <br /> Tank bottom <br /> Gallons ! 21/2" (63.5 mm) Position and 6„ (152mm) clearance <br /> mounting <br /> (95%Tank volume) .. <br /> (equals) <br /> (equals) _(equals) <br /> 95%Volume Height "Y" <br /> — „Xr' <br /> B I Upper Drop Tube Length Tube Length <br /> 4 <br />