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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 /> clude the protective bend in the tube. <br /> (D) <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom oflowertube,valve length. (D) <br /> (W)_ JC Upper k <br /> (D) Tube <br /> = I � f i <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 /> (B) 7 Length, <br /> bottom of <br /> From the tank calibration chart provided by tank manu- cut <br /> facturer find the dipstick number(Y)which corresponds ;i <br /> to the 100°/p volume. (B) <br /> (Y)= To Tank h <br /> (Y) II. <br /> 1. To determine shut-off percentage: Tank <br /> Subtract upper tube length (D)from distance to tank (U)Valve Chart <br /> bottom (B) �` Length, 100°0 ++ <br /> (X)=(B)—(D) -2"= top of cut Volume iry <br /> Dipstick <br /> Using the tank calibration chart provided by the tank 1 <br /> manufacturer determine the tank capacity at the cal- <br /> culated (X)dimension and the 100%volume(Y)tank <br /> capacity. r' <br /> (X)tank capacity in gallons= <br /> (Y)tank capacity in gallons=' <br /> r '�1 <br /> SO%=(X)capacity/(Y) capacity x100= I <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 />