Laserfiche WebLink
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 /> 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 /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube, valve length . <br /> Upper <br /> ( U ) = 1r1 °� Tube <br /> 1 <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 /> ( B ) j 1 �_( cl 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) I <br /> (Y) _ To Tank <br /> ( Y) <br /> 1 . To determine shut- off percentage : Tank <br /> Subtract upper tube length ( D) from distance to tank (U ) Valve ChartII <br /> bottom ( B) Length , 100% 1 <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 . <br /> ( X ) tank capacity in gallons = <br /> (Y ) tank capacity in gallons <br /> SO% _ (X ) capacity / (Y ) capacity x100 = L( ' � <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 />