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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%i <br /> Dipstick Number on Tank Chart that corresponds to 100% volume (Y) (y) <br /> Dipstick Number on Tank Chart that corresponds to SO% (X) � <br /> _ . _ ) <br /> Upper Tube Reference Number Z=Y-X (Z) <br /> Upper Tube Depth Inside Tank C = Z-2 <br /> Distance from top sealing surface for 71 SO Lip' to inside the (C) <br /> top of Storage Tania A <br /> For gn-Testable 77 SO models only <br /> In all cases for nonAestable 71 SO models, the top of the valve body must protrude at least 61/2" 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 61/z" Yes / No <br /> I <br /> If NO, Upper Tube Length (b)= C + A <br /> If YID, Upper Tube Length (D)= 6 'h "+ A <br /> Upper Tube Length = <br /> For Tes abig 73 SO models only <br /> In all cases for Testable 71 SO models, the top of the valve body must protrude at least 6W into the tank to provide <br /> a minimal clearance for proper operation.3 Additionally the total Upper Tube Length must be at least 141/2u of <br /> length to include the protective bend In the tube. <br /> Is C less than 5" Yes / No <br /> If NO, Upper Tube Length (D)= C + A 1 '/z " <br /> IfYE.% Upper Tube Length (D) 6 'h" + A 1 '/z " <br /> Upper Tube Length = <br /> ' Sealing surface may be the top of the Face Seal Adaptor, the built to sealing ledge inside some spill containers, or on non-vapor <br /> tight applications the top of the pipe nipple <br /> a Some Underground Storage tanks utilize a manway system at the top. Make sure to use the top of the storage tank formeasure- <br /> ment and not to top of the manway. Consultyour underground tank manufacturer for height of the manway <br /> a 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 />