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Appendix B <br /> 71 SO Overfill Valve in Tank 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 JurlsdiC, <br /> tion ( AHJ) and review local, state, and national codes to determine the regulatory requirements governing <br /> shutoff capacity in your region, as well as take Into account other considerations such as extreme tanktilt. <br /> Take the following measurements with the valve In- <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 <br /> Include 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. ( 0) <br /> (W) = 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 necessary to add this thickness to dimension <br /> (OPW 6111 & 61 TP models add 0.6') (W) Valve <br /> (g) _ Length, <br /> bottom of <br /> From the tank calibration chart provided bytank mann- cut <br /> facturerfind the dipstick number (Y) which corresponds <br /> to the 100% volume. (8) <br /> (Y) = To Tank <br /> (Y) <br /> 1 . To determine shutoff percentage: Tank <br /> Subtract uppertube length (D) from distance to tank (U) Valve Chart <br /> bottom (B) length, 100% Vol" j <br /> (X) _ (B) _ (D) . 2" = top of cut ume Dip- <br /> stick <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 /> SO% = (X) capacity ! (Y) capacity x100 = <br /> Note : The overfill valve must be installed per AHJ require- <br /> ments and all applicable local, state, and national codes. If <br /> the overfill valve is set above the allowable shutoff percent- <br /> age the overfill valve must be removed and replaced . For <br /> reference 40 CFR part 280 Subpart 8 Section 280.20 overfill <br /> valves should be set to a maximum of 9594. <br /> 20 <br />