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Site: SJ RTD <br /> Appendix B Date: 9/21 /21 <br /> 71 SO Overfill Valve in Tank Shut off Level Worksheet Tank ID 87 Tester ED <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 /> 16 <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 mm <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 in- <br /> clude the protective bend in the tube . <br /> ( D) = 73 <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube, valve length . (D) <br /> (W) = 148 Upper <br /> ( U ) = 147 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 & 61TP models add 0 .6") (W) Valve <br /> ( B) = 152 Length, <br /> I <br /> ottom of <br /> From the tank calibration chart provided by tank manu - cut <br /> facturer find the dipstick number (Y) which corresponds <br /> to the 100% volume . (B) <br /> (Y) = 96 To Tank <br /> M <br /> 1 . To determine shut-off percentage : Tank <br /> Subtract upper tube length (D) from distance to tank ( U) Valve Ll Chart <br /> bottom ( B ) Length, 100% <br /> ( X) = ( B ) - ( D ) - 2 " = 77 top of cut 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 = 8746 <br /> (Y) tank capacity in gallons = 9696 <br /> SO % = (X) capacity / (Y) capacity x100 = 90 . 2 <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 shut-off percent- <br /> age the overfill valve must be removed and replaced . For <br /> reference 40 CFR part 280 Subpart B Section 280 .20 overfill <br /> valves should be set to a maximum of 95 %. <br /> 21 <br />