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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 /> ke the following measurements with the v ve in- <br /> sta d in the tank: <br /> Distan from the 71 SO inlet tube fla a to the cast <br /> lug in the 1 SO body(see figures), pper tube length. <br /> Note: the U er Tube Length m be at least 16"to in- <br /> clude the prote 've bend in t tube. <br /> (D)_ <br /> Distance from the 71 let tube flange to the top and <br /> bottom of lower t e,valy length. (D) <br /> (W)= <br /> Upper <br /> (U)_ Tube <br /> Distan from the 71 SO inlet tube flange to the bottom <br /> of t tank. Note,If a tank bottom protector is present it <br /> m be necessary to add this thickness to dimension <br /> PW 6111 &61 TP models add 0.6") (W)Valve <br /> (B)_ /en <br /> Length, <br /> bottom of <br /> From the tank calibration chart providcut <br /> facturer find the dipstick number(Y)w <br /> to the 100%volume. (B) <br /> (Y)_ ( 123/b, To Tank <br /> (Y) <br /> 1. To determine shut-off percentagTank <br /> Subtract upper tube length(D)from di (U)Valve chart <br /> bottom(B) Length, 100% <br /> (X)_(B)-(D)-2"= CXn r14top of cut Volume <br /> Dipstick <br /> i <br /> Using the tank calibration chart p ovided by the tank <br /> manufacturer determine the tan capacity at the cal- <br /> culated(X)dimension and the 0%volume(Y)tank <br /> capacity. <br /> I <br /> (X)tank capacity in gallons PiW <br /> (Y)tank capacity in gallo = 19, 1 FZ <br /> o C.qS Jv <br /> SO/o=(X)capacity/(Y)�apacity 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 />