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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 /> 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 /> H <br /> clude the protective bend in the tube. <br /> >f <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube,valve length. (D) <br /> (W)_ `(L Upper <br /> (U) _ Tube <br /> a <br /> Distance from the 71 SO 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 &61 TP models add 0.6") (W)Valve <br /> _ Length, <br /> (B) <br /> bottom of <br /> `I cut <br /> From the tank calibration chart provided by tank manu- <br /> facturer find the dipstick number(Y) which corresponds (B) <br /> to the 100%volume. To Tank <br /> (Y) <br /> 1. To determine shut-off percentage: Tank <br /> U)ValvChart <br /> Subtract upper tube length (D)from distance to tank (Length, 100% <br /> bottom (B) top of cut Volume <br /> (X)=(B)—(D)-2"_ -[ 7 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= �t5 <br /> (Y)tank capacity in gallons=— o <br /> 50%=(X)capacity/(Y)capacity x100= q 3•Z' Note: The overfill valve must be installed per AM 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 />