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Appendix A <br />71 SO Overfill Valve Upper Tube Calculation Worksheet <br />Important: This is meant to be supplemental worksheet and not a substitute to following the installation <br />manual instructions. All length measurements are in inches. Please contact the Authority Having Jurisdic- <br />tion (AHJ) and review local, state, and national codes to determine the regulatory requirements governing <br />shut-off capacity in your region, as well as take into account other considerations such as extreme tank tilt. <br />Desired tank capacity for shut-off. SO%= G Fr <br />Dipstick Number on Tank Chart that corresponds to SO%=R �5��(X} <br />(X)Tank Diameter (100% volume) (Y) <br />Upper Tube Reference NumberZ=Y-X t -U 2A�Z} <br />— 2 <br />Upper Tube Depth Inside Tank C = Z-2" <br />Distance from top sealing surface for 71 SO Lip' to inside the �I �� (C} <br />top of Storage Tan k2 A=— 4 `. — <br />For Non -Testable 71 SO models only <br />In all cases for non -testable 71 SO models, the top of the valve body must protrude at least 6'/2" into the tank to <br />provide a minimal clearance for proper operation.3 Additionally the total Upper Tube Length must be at least 16" <br />of length to include the protective bend in the tube. <br />Is C less than 6'/2" <br />If NO, Upper Tube Length (D)= C + A <br />If YES, Upper Tube Length (D)= 6'/2 "+ A <br />For Testable 71 SO models only <br />Yes / No <br />Upper Tube Length = <br />In all cases for Testable 71 SO models, the top of the valve body must protrude at least 61/2" into the tank to provide <br />a minimal clearance for proper operation.' Additionally the total Upper Tube Length must beat least 14'/z" of <br />length to include the protective bend in the tube. <br />Is C less than 5" Yes I <br />If NO, Upper Tube Length (D)= C + A —1 1/2 " <br />If YES, Upper Tube Length (D) = 6'/2" + A —1 '/2 " ( I <br />Upper Tube Length = '� I X <br />' Sealing surface may be the top of the Face Seal Adaptor, the built in sealing ledge inside some spill containers, or on non -vapor <br />tight applications the top of the pipe nipple <br />2 Some Underground Storage tanks utilize a manway system at the top. Make sure to use the top of the storage tank for measure- <br />mentandnotto top of the manway. Consultyour underground tank manufacturerfor height ofthe manway <br />3 This measurement is taken from the seam where the upper tube is attached to the valve body to the inside of the tank top_ <br />l9 <br />