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Appendix A 71 SO Overfill Valve Upper Tube Calculation Worksheet Imp rtant: 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. 4 Desired tank capacity for Shut-off: SO%= Dipstick Number (Y)on Tank Chart that corresponds to 100%volume= M Dipstick Number on Tank Chart that corresponds to SO%(X)= M Upper Tube Reference Number Z=Y-X (Z) Upper Tube Depth Inside Tank C=Z-2" �2 Distance from top sealing surface for 71 SO Lip'to inside the '" (C) top of Storage Tank2 A=. 3.3 For Non-Testable 71SO models o" In all cases for non-testable 7150 models,the top of the valve body must protrude at least 6 1/2"into the tank to provide a minimal clearance for proper operation,' Additionally the total Upper Tube Length must be at least 16" of length to include the protective bend in the tube. Is C less than 61/2" Yes 1 N If NO,Upper Tube length(D)=C+A If YES,Upper Tube Length (D)=6'/2"+A Upper Tube Length = 5 For Testable 71 SO models only In all cases for Testable 71S❑ models,the top of the valve body must protrude at least 6'1/2"into the tank to provide a minimal clearance for proper operation.' 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 6 1/2" Yes 1 No If NO,Upper Tube Length (D)�C+A— 1 '/2" If YES,Upper Tube Length(D)=6'/2"+A— 1 1/2" Upper Tube Length = ' Sealing surface may be the top of the Face Seal Adapror,the built in sealing ledge inside some spill containers,or on non-vapor right applications the top of the pipe nipple 2 Some Underground Storage tanks utilize a manway system at the top. Make sure to use(lie top of the storage tank for measure- ment and not ro top of the mar:way. Consulr 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