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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-instrcictions. All Iengthroe asurements i eTn-1nche—s. Phase contact Jthe 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 UpperTube Length must be at least 16"to in- <br /> clude the protective bend in the tube. <br /> (D)= 7 <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower e,valve length, <br /> (W)_ -I-77 - (D) <br /> (t1)_ J._Jly Upper <br /> Tube <br /> Distance from the 71 SO Inlet tube flan a the bottom <br /> of the tank. Note:If a tank bo rote ar is present it <br /> may be necessary to add this thickness to dimension <br /> (OPW 611.1 &6 TP models add 0.6") (W)Valve <br /> (B) length, <br /> bottom of <br /> From the tank calibration chart provided by tank mann- cut <br /> facturer find the dipstick number(Y)which corresponds <br /> to the 100%volume. (8} <br /> (Y)= To Tank <br /> 1. To determine shut-off percentage: M <br /> Tank <br /> Subtract upper tube length(D)from distance to tank (U)Valve Chart <br /> bottom(8) , Length, <br /> (X)=(B)-(D)-2"_ �i top of cut 1o0% <br /> Volume <br /> Using the tank calibration chart provided by the tank Dipstick <br /> manufacturer determine the tank capacity at the cal- <br /> culated(X)dimension and the 100°x6 volume(Y)tank � <br /> capacity. <br /> (X)tank capacity in gallons <br /> (Y)tank capacity in gallons=—A 73 <br /> 01 <br /> SO%=(X)capacity!(Y)capacity x100= ��• to <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 />