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I `- <br /> f�- Che. v/ten <br /> Appendix BB <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 /> 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 ) _ r / t ILIo <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube, valve length . <br /> (w) = 13/L� 137 ( D) <br /> ( U ) I J) 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 4 <br /> may be necessary to add this thickness to dimension <br /> (OPW 611 I .&ZITP models add 0 .6 " ) it (W) Valve <br /> ( B) _ 3 � 136 I 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% volu1 e . ( B) <br /> (Y) _ <br /> To Tank <br /> (Y) <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% <br /> ( X ) = ( B ) — ( D ) - 2 " _ 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 . j <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 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 />