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i � Appendix B 71 SO Overfill Valve in Tank Shut off Level Worksheet Important: This is meant to be supplemental worksheet and not a substitute to following the installation manual instructions. All length measurements are in inches. Please contact the Authority Having Jurisdic- tion (AHJ)and review local,state,and national codes to determine the regulatory requirements governing shut-off capacity in your region,as well as take into account other considerations such as extreme tank tilt. Take the following measurements with the valve in- stalled in the tank: Distance from the 71 SO inlet tube flange to the cast lug in the 71 SO body(see figures),upper tube length. Note: the Upper Tube Length must be at least 16"to in- clude the protective bend in the tube. = I- (D) Distance from the 71 SO inlet tube flange to the top and bottom of to �r tube,valve length. (D) (W)= Upper i (U)= Tube I Distance from the 71 SO inlet tube flange to the bottom ---.------- of the tank. Note: If a tank bottom protector is present it may be necessary to add this thickness to dimension (OPW 6111 &61TP models add 0.6") (W)Valve (B)= Length, bottom of n hart provided b tank manu- facturer cut 1! From the tank calibration c p y1, find the dipstick number(Y) which corresponds to the 100%volume. (B) = 11 c (Y) To Tank �I (Y) 11 1. To determine shut-off percentage: Tank Subtract upper tube length (D)from distance to tank (U)Valve Chart bottom (B) , I Length, 100% of cut I (X)_(B)-(D)-2 = �� L� top Volume Dipstick Using the tank calibration chart provided by the tank manufacturer determine the tank capacity at the cal- culated (X)dimension and the 100%volume(Y)tank capacity. G, (X)tank capacity in gallons= (Y)tank capacity in gallons= 5�0 -- SO%=(X)capacity/(Y)capacity x100=�� Note: The overfill valve must be installed per AHJ require- ments and all applicable local,state,and national codes. If the overfill valve is set above the allowable shut-off percent- age the overfill valve must be removed and replaced. For reference 40 CFR part 280 Subpart B Section 280.20 overfill valves should be set to a maximum of 959/o. 21