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Appendix B QS #121 87 DT 5-16-2024 <br /> 71SO Overfill Valve In Tank Shut Off Level <br /> Worksheet <br /> Important: This is meant to be a supplemental - <br /> worksheet and not a substitute to following the <br /> installation manual instructions. All length <br /> measurements are in inches. Please contact the <br /> Authority Having Jurisdiction (AHJ) and review <br /> local, state, and national codes to determine the <br /> regulatory requirements governing shut-off <br /> capacity in your region, as well as take into <br /> account other considerations such as extreme <br /> tank tilt. ( ) <br /> U per <br /> With valve installed in the tank take the following Tu e <br /> measurements: Le gth <br /> Distance from the 71 SO inlet tube flange to the cast <br /> lug in the 71 SO body (see figures), upper tube <br /> length. Note: the Upper Tube Length must be at ( ) <br /> least 16"to include the protective bend in the tube. V ve <br /> (D) = 46.75 Le th, <br /> bottc m of <br /> ct <br /> Distance from the 71 SO inlet tube flange to the ( ) <br /> bottom of the tank. Note: If a tank bottom protector To ank <br /> is present it may be necessary to add this thickness Boltom <br /> to dimension (OPW 6111 & 61 TP models add 0.6") ( ) <br /> (B) = 128.875 Tz nk <br /> (U) Valve Cl- rt <br /> From the tank calibration chart provided by tank Length, 10)% <br /> manufacturer find the dipstick number (Y) which top f Vol me <br /> o cit Dipstick <br /> corresponds to the 100% volume. Number <br /> (Y) = 89.75 <br /> 1. To determine shut-off percentage: <br /> Subtract upper tube length (D) from distance to <br /> tank bottom (B) <br /> (X) _ (B)—(D) -2" = 80.125 <br /> Using the tank calibration chart provided by the Note: The overfill valve must be installed per AHJ <br /> tank manufacturer determine the tank capacity at requirements and all applicable local, state, and <br /> the calculated (X) dimension and the 100% volume national codes. If overfill valve is set above the <br /> (Y) tank capacity. allowable shut-off percentage the overfill valve <br /> must be removed and replaced. For reference 40 <br /> (X) tank capacity in gallons = 10915 CFR part 280 Subpart B Section 280.20 overfill <br /> valves should be set to a maximum of 95%. <br /> (Y) tank capacity in gallons = 11527 <br /> SO% _ (X) capacity/ (Y) capacity x 100 = 94.7 <br />