Laserfiche WebLink
Appendix B 91 Drop Tube <br /> 71SO Overfill Valve In Tank Shut Off Level <br /> Worksheet <br /> Important: This is meant to be a supplemental <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 e <br /> capacity in your region , as well as take into <br /> account other considerations such as extreme <br /> tank tilt . ( p) <br /> Upper <br /> With valve installed in the tank take the following Tule <br /> measurements : Le gth <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 ( ) <br /> least 16 " to include the protective bend in the tube . Va ve <br /> ( D ) = 59 . 75 " <br /> Length , <br /> bottc m of <br /> Distance from the 71 SO inlet tube flange to the top c it <br /> and bottom of lower tube , valve length . ( ) <br /> (W) = 138 . 5 " To ank <br /> ( U ) = 136 . 5" Bo om <br /> Distance from the 71 SO inlet tube flange to theT nk <br /> bottom of the tank. Note : If a tank bottom protector ( Le alve th ,e 1010% <br /> is present it may be necessary to add this thickness top of Vol me <br /> to dimension (OPW 6111 & 61TP models add 0 . 6") c it Dip tick <br /> ( B ) = 142 Number <br /> From the tank calibration chart provided by tank <br /> manufacturer find the dipstick number (Y) which <br /> corresponds to the 100 % volume . <br /> (Y) = 89 . 75 " <br /> I . To determine shut-off percentage : <br /> Subtract upper tube length ( D) from distance to <br /> tank bottom ( B) <br /> ( X) _ ( B ) — ( D ) - 2 " = 80 . 25" <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 = 10927 CFR part 280 Subpart B Section 280 . 20 overfill <br /> valves should be set to a maximum of 95 % . <br /> (Y) tank capacity in gallons = 11527 <br /> SO % _ (X) capacity / (Y) capacity x 100 = 94. 75% <br />