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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 (Z) <br /> - 2 <br /> Upper Tube Depth Inside Tank C = Z-2 " <br /> Distance from top sealing surface for 71 SO Lip ' to inside the ® (�> <br /> top of Storage Tank2 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 6 '/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 6 '/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 '/2" 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 may be the top of the Face Seal Adaptor, the built in sealing ledge inside some spill containers, or on non-vapor <br /> tight applications the top of the pipe nipple <br /> z Some Underground Storage tanks utilize a manway system at the top. Make sure to use the top of the storage tank for measure- <br /> ment and not to top of the manway. Consult your underground tank manufacturer for height of the manway <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 />