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Appendix C (continued) <br /> y 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 7150 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 7150 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 <br /> may be necessaryto add this thickness to dimension <br /> (OPW 6111 & 61TP models add 0 .6") <br /> (B) _ {1N) Valve <br /> Length, <br /> From the tank calibration chart provided by tank manu- bottomof cut <br /> facturer find the dipstick number (1) which corresponds <br /> to the 1000/6 volume. (B) <br /> (Y) = To Tank <br /> 1 . To determine complete shut-off percentage: {Y) <br /> Tank <br /> Subtract upper tube length (D) from distance to tank (U) Valve Chart <br /> bottom (B) Length, 100% <br /> (X) = (B) — ( D) + 1 .S" = 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 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 />