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��- - 1' Appendix B <br /> 71 SO Overfill Valve in Tank Shut off bevel Worksheet <br /> Imnorta= 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: <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 Upper Tube Length must be at least 16"to in- <br /> clude the protective bend in the tube. <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of/l9wer tube,valve length <br /> (W)= L / <br /> _ 7 �/ Upper <br /> (U) <br /> Tube <br /> Distance from the 7150 inlet tube flange to the bottom <br /> of the tank, Note:If a tank bottom protector is present it — — — <br /> may be necessary to add this thickness to dimension <br /> (OPW 6111 &61TPmodels add 0.6") (W}Valve <br /> (B)= Length, <br /> bottom of <br /> From the tank calibration chart provided by tank manu- cut <br /> facturer find the dipstick number(Y)which corresponds <br /> to the 100%volume. (i3} <br /> (Y)= To Tank <br /> (Y} <br /> i. To determine shut-off percentage: Tank <br /> Subtract upper tube length(D)from distance to tank (U}Valve Chart <br /> bottom(B) Length, 100% <br /> (X)=(B)-(D)-2"_ L` 5^ top of cut Volume <br /> 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 /> (X)tank capacity in gallons <br /> (Y)tank capacity in gallons=� ' <br /> SO%=(X)capacity/(Y)capacity x104=� <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 260.20 overfill <br /> valves should be set to a maximum of 951b. <br /> 21 <br />