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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%= <br /> Dipstick Number on Tank Chart that corresponds to 100%volume(Y)= 0 (Y) <br /> Dipstick Number on Tank Chart that corresponds to SO%(X)_ (X) <br /> Upper Tube Reference Number Z=Y-X _ 2 (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 Tank' 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 61/2"into the tank to <br /> provide a minimal clearance for proper operation.' 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 61/2" Yes / No <br /> If NO,Upper Tube Length(D)=C+A <br /> If YES,Upper Tube Length(D)=61/2"+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'/z"into the tank to provide <br /> a minimal clearance for proper operation.' Additionally the total Upper Tube Length must beat least 141/2"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 1/2" <br /> If YES,Upper Tube Length(D)=61/2"+A- 1 1/2" <br /> Upper Tube Length= <br /> ' Sealing surface maybe the top of the Face Seal Adaptor,the built in sealing ledge inside some spill containers,or on non- <br /> vapor tight applications the top of the pipe nipple <br /> 2 Some Underground Storage tanks utilize a man way system at the top. Make sure to use the top of the storage tank for <br /> measurement and not to top of the man way. Consultyour underground tank manufacturer for height of the man way <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 /> 20 <br />