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Appendix B '6 7 <br /> 71 SO Overfill Valve in Tank Initial 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: _ri <br /> Distance from the 71 SO inlet tube flange to the cast <br /> lugin the 71 SO body(see figures),u <br /> Y g peer tube length. � <br /> (Vote: the Upper Tube Length must be at least 16"to in- <br /> clude the protective bend in the tube. > <br /> g <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lom!pr ti iho ;_, <br /> (U)_ (019,1 Upper I <br /> Tube } �? <br /> Distance from the 71 SO inlet tube flange to the bottom I <br /> of the tank. Note: If a tank bottom protector is present it <br /> may be necessary to add this thickness to dimension <br /> 1, <br /> 'I Lf"/ <br /> (OPW 6111 &61 TP models add 0.6") i> MValve <br /> (B)=- 03I Length, <br /> bottom of y, <br /> From the tank calibration chart provided by tank manu- ,i cut <br /> facturer find the dipstick number(Y)which corresponds `y <br /> to the 100%volume. (B) <br /> (Y)=, To Tank <br /> r,:r <br /> 1. To determine shut-off percentage: M <br /> Subtract upper tube length (D)from distance to tankTank <br /> (U)Valve Chart <br /> � <br /> bottom (B) Length, 100% <br /> (X)=(B)—(D)-2„= `%-L top , <br /> of cut Volume <br /> 1 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 /> l <br /> (X)tank capacity in gallons= Z2%09 s �i <br /> (Y)tank capacity in gallons= 2Hj 7d 1 <br /> SO%_(X)capacity/(Y)capacity x100= 1k -*34 <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 />