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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: SO%= Dipstick Number(Y)on Tank Chart that corresponds to 100%volume- 0 (y) Dipstick Number on Tank Chart that corresponds to SO%(X)_ E= (X) Upper Tube Reference Number Z=Y-X 0 2 (Z) — Upper Tube Depth Inside Tank C=Z-2" Distance from top sealing surface for 71 SO Lip' to inside the (C) top of Storage Tank2 A= 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'/2"into the tank to provide a minimal clearance for proper operation.' 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'/2" Yes / No If NO,Upper Tube Length (D)=C+A If YES,Upper Tube Length (D)=6'/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'/2" into the tank to provide a minimal clearance for proper operation.' Additionally the total Upper Tube Length must beat least 14'/2"of length to include the protective bend in the tube. Is C less than 5" Yes / No If NO,Upper Tube Length (D)=C+A— 1 1/2" If YES,Upper Tube Length(D)=61/2"+A- 1 1/2" 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 2 Some Underground Storage tanks utilize a man way 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 of the manway 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. 20