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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 Jurisdic- <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 in- <br /> stalled in the tank: <br /> l <br /> ----_—_ � <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 /> elude the protective bend in the tube . j <br /> ( D) _ E (;2� 1 1 L <br /> Distance from the 71 SO inlet tube flange to the top and I 1 <br /> bottom of lower tube, valve length . <br /> Upper <br /> ( U ) = 1 S 3 Tube I 'j <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") (1M Valve l <br /> Length, <br /> bottom 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) _ f To Tank <br /> M <br /> 1 . To determine shut-off percentage: Tank <br /> Subtract upper tube length ( D) from distance to tank (U) Valve Chart <br /> bottom (B) Length , 100% li <br /> (} ) — ( g ) — ( D ) - 2" = I top of cut Volume j <br /> Dipstick I <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 !r <br /> capacity. <br /> (X ) tank capacity in gallons = ( � S Y <br /> c� <br /> (Y) tank capacity in gallons = 4 f _ _ _ ..- - - -- - -- - ---- ---- --------- -/� <br /> SO% = (X) capacity / (Y) capacity x100 = c <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 hp tet to a maximum of 95%, <br /> 21 <br />