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Appendix B I <br /> 71SO Overfill Valve In Tank Shut Off Level <br /> Worksheet <br /> Important : This is meant to be a supplemental - - Ir <br /> - <br /> worksheet and not a substitute to following the <br /> installation manual instructions . All length <br /> measurements are in inches . Please contact the <br /> Authority Having Jurisdiction ( AHJ ) and review <br /> local , state , and national codes to determine the <br /> regulatory requirements governing shut-off ' <br /> capacity in your region , as well as take into <br /> account other considerations such as extreme ( D ) <br /> tank tilt . Upper <br /> With valve installed in the tank take the following Tube j <br /> Length <br /> measurements : _-j <br /> Distance from the 71 SO inlet tube flange to the cast <br /> lug in the 71 SO body ( see figures ) , upper tube <br /> length . Note : the Upper Tube Length must be at A <br /> least 16 " to� incl de the protective bend in the tube . Valve <br /> Length , <br /> ( D ) _ �U bottom of <br /> cut <br /> Distance from the 71 SO inlet tube flange to the top <br /> and bottom of lower tube , valve length . ( B ) <br /> (W ) _ ( �� �� To Tank <br /> ( U ) = I ,�lYi I Zli' Bottom ( Y ) <br /> Tank <br /> Distance from the 71 SO inlet tube flange to the ( U ) Valve Chart <br /> bottom of the tank . Note : If a tank bottom protector Length , — 100 % <br /> is present it may be necessary to add this thickness top of Volume <br /> to dimension ( • PW 611, 1 & 61 TP models add 0 . 6 " ) cut Dipstick <br /> ( B ) _ t Number <br /> From the tank calibration chart provided by tank f <br /> manufacturer find the dipstick number (Y ) which <br /> corresponds to th 1000/q volume . <br /> ( Y) = c ti c (� 11ie.? <br /> 1 . To determine shut-off percentage : <br /> Subtract upper tube length ( D ) from distance to <br /> tank bottom ( B ) <br /> Using the tank calibration chart provided by the Note : The overfill valve must be installed per AHJ <br /> tank manufacturer determine the tank capacity at requirements and all applicable local , state , and <br /> the calculated ( X ) dimension and the 100 % volume national codes . If overfill valve is set above the <br /> ( Y ) tank capacity . allowable shut- off percentage the overfill valve <br /> must be removed and replaced . For reference 40 <br /> X tank capacity in gallons = t 7 � / J 0 CFR part 280 Subpart B Section 280 . 20 overfill <br /> ( ) p Y g <br /> r �A C� l valves should be set to a maximum of 95 % . <br /> (Y ) tank capacity in gallons (v <br /> SO % _ ( X) capacity / ( Y ) capacity x 100 = �� � <br />