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Appendix C ( continued ) <br /> 71 SO Overfill Valve in Tank Complete Shut Off Level 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 /> Take the following measurements with the valve in - <br /> stalled in the tank: <br /> Distance from the 71 SO inlet tube flange to the cast = - - - <br /> lug in the 71 SO body ( see figures) , upper tube length . <br /> Note : the Upper Tube Length must be at least 16" to in - <br /> clude the protective bend in the tube . <br /> ( D ) _ <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube, valve length . <br /> (W) _ ( D) <br /> ( U ) = Upper <br /> Tube <br /> Distance from the 71 SO inlet tube flange to the bottom <br /> of the tank. Note : If a tank bottom protector is present it IL <br /> may be necessary to add this thickness to dimension <br /> (OPW 6111 & 61 TP models add 0 .6") (W) Valve <br /> ( B) = Length, <br /> bottom <br /> From the tank calibration chart provided by tank manu - of cut <br /> facturer find the dipstick number (Y) which corresponds <br /> to the 100 % volume . (B) <br /> (Y) = To Tank <br /> 1 . To determine complete shut-off percentage: Tank <br /> Subtract upper tube length ( D) from distance to tank ( U) Valve Chart <br /> bottom ( B ) Length, 100 % <br /> (X) _ ( B) - ( D) + 1 . 5 = top of Volume <br /> Dipstick <br /> Using the tank calibration chart provided by the tank <br /> manufacturer determine the tank capacity at the cal - <br /> culated (X) dimension and the 100 % volume (Y) tank <br /> capacity. <br /> (X) tank capacity in gallons = <br /> (Y) tank capacity in gallons = <br /> Complete SO% _ ( X) capacity / (Y) capacity x100 = <br /> Note : The overfill valve must be installed per AM re- <br /> quirements and all applicable local , state, and national <br /> codes . If the overfill valve is set above the allowable <br /> shut-off percentage the overfill valve must be removed <br /> and replaced . <br /> Note. This Appendix only applies to valves installed per Appendix C . See Appendix B for the standard valve <br /> installation tank shut off level worksheet . <br /> 24 <br />