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IZk- <br />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 (AHA 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 - <br />Dipstick Number on Tank Chart that corresponds to SO%= <br />Tank Diameter (100% volume) (Y <br />Upper Tube Reference Number Z=Y-X <br />Upper Tube Depth Inside Tank C = Z-2" <br />Distance from top sealing surface for 71 SO Lip' to inside the <br />top of Storage Tank2 <br />SO%= <br />— (X) 94-16 <br />t Z a s (Z) <br />— 2 <br />to?s' (C) <br />A= 40 <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'/z" 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'/z" Yes / No <br />If NO, Upper Tube Length (D)= C + A <br />If YES, Upper Tube Length (D)= 6'/2 "+ A <br />Upper Tube Length = <br />For Testable 71 SO models only <br />In all cases for Testable 71 SO models, the top of the valve body must protrude at least 6'/z" into the tank to provide <br />a minimal clearance for proper operation 3 Additionally the total Upper Tube Length must be at least 14'/2" of <br />length to include the protective bend in the tube. <br />Is C less than 5" �/ No <br />6NO Upper Tube Length (D)= C + A -1 '/2 " <br />If YES, Upper Tube Length (D) = 61/2" + A -1 '/2 " 1� <br />Upper Tube Length =4S <br />Sealing surface maybe 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 />Some Underground Storage tanks utilize a manwaysystem at the top. Make sure to use the top of the storage tank for measure- <br />mentandnotto top of the manway. Consultyour underground tankmanufacturer for 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 ofthe tank top. <br />19 <br />