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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 accotmt other considerations such as extreme tank tilt . <br /> Take the following measurements with the valve Inn <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 /> M _ <br /> ( D) <br /> ( U ) <br /> Upper I <br /> Tube j <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 - --- – – — -- -may be necessary to add this thickness to dimension <br /> (OPW 6111 & 61 TP models add 0 .6") <br /> ( B ) _ (W) Valve <br /> Length, <br /> From the tank calibration chart provided by tank manu - bottom <br /> �1 <br /> facturer find the dipstick number ( 1) which corresponds of cut <br /> to the 100 % volume , ( B) <br /> (Y) = To Tank <br /> I <br /> 1 . To determine complete shut-off percentage: M <br /> Subtract upper tube length ( D) from distance to tank ( U) VaTank <br /> lve Chart <br /> bottom ( B) Length, <br /> (X) _ (B ) mo ( D) + 1 . 5 " = 100% <br /> top of Volume j <br /> � <br /> Using the tank calibration chart provided by the tank Dipstick <br /> manufacturer determine the tank capacity at the calm <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 AHJ 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 />