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Appendix B _ - --- <br /> 71 SO 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 consideraMons such as extreme <br /> tank tilt. (D) <br /> Upper <br /> With valve installed in the tank take the following Tube <br /> measurements: Lenqth <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 (W) <br /> least 16" to include the protective bend in the tube. Valve <br /> (p) = Length, <br /> bottom of <br /> Distance from the 71 SO inlet tube flange to the top cut <br /> and bottom of lower tube, valve length. (B) <br /> (IN) = To Tank <br /> (U) _ Bottom <br /> (Y} <br /> Distance from the 71 SO inlet tube flange to the Tank <br /> bottom of the tank. Note: If a tank bottomrotector (U) Valve Chart <br /> p Length, 100% <br /> is present it may be necessary to add this thickness top of Volume <br /> to dimension (OPW 6111 61 TP models add 0.6") cut Dipstick <br /> (B) = Number <br /> From the tank calibration chart provided by tank <br /> manufacturer find the dipstick number (Y) which <br /> corresponds to the 100% volume. , <br /> (Y) <br /> 1. To determine shut-off percentage: t <br /> Subtract upper tube lengtl,,(D) from distance to <br /> tank bottom (B) <br /> (X) _ (B)—(D)-2" = <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 = CFR part 260 Subpart B Section 280.20 overfill <br /> valves should be set to a maximum of 95%. <br /> (Y) tank capacity in gallons = <br /> SO% = (X)capacity 1(Y) capacity x 100 = <br />