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Appendix A 71 SO Overfill Valve Upper Tube Calculation Worksheet important: This is meant to be supplemental worksheet and not a substitute to following the installation manual instructions. All length measurements are in inches. Please contact the Authority Having Jurisdic- tion (AHJ) and review local, state, and national codes to determine the regulatory requirements governing shut-off capacity in your region, as well as take into account other considerations such as extreme tank tilt. Desired tank capacity for shut-off: Dipstick Number on Tank Chart that corresponds to SO%= Tank Diameter (100% volume) (Y) Upper Tube Reference NumberZ=Y-X Upper Tube Depth Inside Tank C = Z-2" (Z) 2 Emf (C) Distance from top sealing surface for 71 SO Lip' to inside the top of Storage Tan kz A=---4- For Non -Testable 71 SO models only 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 provide a minimal clearance for proper operation 3 Additionally the total Upper Tube Length must beat least 16" of length to include the protective bend in the tube. Is C less than 6'/z" Yes / No If NO, Upper Tube Length (D)= C + A If YES, Upper Tube Length (D)= 61/2 "+ A Upper Tube Length = For Testable 71 SO models only In all cases for Testable 71 SO models, the top of the valve body must protrude at least 6'/i" into the tank to provide a minimal clearance for proper operation 3 Additionally the total Upper Tube Length must beat least 141/2" of length to include the protective bend in the tube. Is C less than 5" Yes / if NO, Upper Tube Length (D)= C + A —1 '/2 " If YES, Upper Tube Length (D) = 61/2"+A-1 '/z " i ( I Upper Tube Length= Sealing surface may be the top of the Face Seal Adaptor, the built in sealing ledge inside some spill containers, or on non -vapor tight applications the top of the pipe nipple Some Underground Storage tanks utilize a manway system at the top. Make sure to use the top of the storage tank for measure- ment and not to top of the manway. Consult your underground tank manufacturer for height ofthe manway This measurement is taken from the seam where the upper tube is attached to the voive body to the inside of the tank top_ 19