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mast A� a ndix 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 .Jt(risdic- tion (AHJ) and review local, state, and national •codes to determine the regulatory requirements governing shut-off cep4city 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 . Sam Distance from the 7150 inlet tube flange to the top and bottom of lower tube, valve length . (D) (W) _ 6 Upper (U ) Whom Tube Distance from the 71 SO inlet tube flange to the bottom •• 1 • ••• •- -1111• so is of the tank. Note: if a tank bottom protector is present it s may be necessary to add this thickness to dimension (OPW 6111 & 61 TP models add 0.61 QAsk son, (W) ValveRow (g) _ �Ii " (� M Length, to bottom of cut From the tank calibration chart provided by tank manu- \ M facturer find the dipstick number (Y) which corresponds to the 100% volume. To Tank (B) — • � (Y) 1 . To determine shut-off percentage: Tank Subtract upper tube length (D) from distance to tank (U) Valve _. _ Chart bottom (B) Length, 100% (X) _ (g) „ (p) - 2„ _ p ►1Z - ,�3 /y -Z = / 0S top of cut Volume -- Dipstick On 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. c' ... (X) tank capacity In gallons = a .(Y) tank capacity in gallons = I � X03 • ' , : . .. . . . .:_..:.�.-.,.. . . . , . .. . . _ . . . .. SO% = (X) capacity / (Y) capacity x100 = 9 `�' �-� Mote: The overfill valve must be Installed per AHJ require- ments and all applicable local, state, and national codes , If 19669 the overfill valve is set above the allowable shut-off percent- x 1 oo � g y . � 5 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 95%.