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Appendix B 71SO Overfill Valve In Tank Shut Off Level Worksheet Important: This is meant to be a supplemental worksheet and not a substitute to following the installation manual instructions. All length measurements are in inches. Please contact the Authority Having Jurisdiction (AHJ) and review local, state, and national codes to determine the regulatory requirements governing shut-off capacity in your region, as well as take into account other considerations such as extreme tank tilt. With valve installed in the tank take the following measurements: Distance from the 71 SO inlet tube flange to the cast lug in the 71 SO body (see figures), upper tube length. Note: the Upper Tube Length must be at least 16" to include the protective bend in the tube. (D) = 35.5 Distance from the 71 SO inlet tube flange to the bottom of the tank. Note: If a tank bottom protector is present it may be necessary to add this thickness to dimension (OPW 6111 & 61TP models add 0.6") (B) = 114.5 From the tank calibration chart provided by tank manufacturer find the dipstick number (Y) which corresponds to the 100% volume. (Y) = 89.75 1. To determine shut-off percentage: Subtract upper tube length (D) from distance to tank bottom (B) (X)=(B)—(D)-2"=77 Using the tank calibration chart provided by the tank manufacturer determine the tank capacity at the calculated (X) dimension and the 100% volume (Y) tank capacity. (X) tank capacity in gallons = 8908 (Y) tank capacity in gallons = 9684 SO% _ (X) capacity / (Y) capacity x 100 = 92 Note: The overfill valve must be installed per AHJ requirements and all applicable local, state, and national codes. If overfill valve is set above the allowable shut-off percentage the overfill valve must be removed and replaced. For reference 40 CFR part 280 Subpart B Section 280.20 overfill valves should be set to a maximum of 95%.