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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 (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 - <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 Tank' <br />SO%= <br />t F M D(Amt79f <br />(X) <br />i Z a e (Z) <br />2 <br />to?s' (C) <br />A= <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 beat least 16" <br />of length to include the protective bend in the tube. <br />Is C less than 6'/2" 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'/2" into the tank to provide <br />a minimal clearance for proper operation.' Additionally the total Upper Tube Length must beat 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 1/z " <br />If YES, Upper Tube Length (D) = 6'/z" + A -1 1/z " o/ <br />Upper Tube Length = `eeII 7 $ NY <br />' Sealing surface may be the top of the Face Sea/Adaptor, the built in sealing ledge inside some spill containers, or on non -vapor <br />tight applications the top of the pipe nipple <br />z Some Underground Storage tanks utilize a manway system at the top. Make sure to use the top of the storage tank for measure- <br />mentandnottotopofthemanway. Consultyour underground tank manufacturer for height of the 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 />19 <br />