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Determine drop tube lengths <br /> Defender Spill Contain ent(Ref.) <br /> Seat surface of upper drop tube <br /> 0 <br /> laxly <br /> X„ Top of Tank <br /> Upper Drop Tube <br /> Final Shutoff Volume" <br /> Overfill Prevention Valve <br /> "All„ <br /> (U-S-T) I1 <br /> Lower ..B„ <br /> Drop Tube <br /> «Y„ <br /> uyn <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 /> Actual Tank Capacity <br /> To find Upper Drop Tube length"X" To find Lower Drop Tube length"Y" <br /> { <br /> " Drop tube seat " Final shutoff <br /> Gallons "A" surface to "B" ,Z volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) OPV Leng th <br /> q Final shutoff 15'/,"(400 mm) Offset <br /> e )3 Typically 9540*` "B" volume height <br /> - (subtract) - (subtract) <br /> su <br /> ( ) <br /> Final shutoff volume Position and I 6"(152mm) clearance Tank bottom <br /> `l Zg (gallons) 2Y:"(63.5 mm) mounting <br /> adjustment <br /> (equals) _ (equals) <br /> Final Shutoff Volume Height uppert7mpT°°°Lengm I MeerDarm Lenlylb <br />