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Atopendix 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 . t(risdic- tion (AFIJ) and review local, state, and nationakodes to determine the regulatory requirements governing shut-off capocity In your region, as well as take into account other considerations such as extreme tank tilt. Take the folloWltig measurements with the valve in• (, _ stalled in the tank: Distance from the 71SO 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. (D) Distance from the 71 SO inlet tube flange to the top and bottom of lower tube, valve length . (p) W = 1 b 5 :34? Upper (U) '/2 ` Tube 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 _ (0PW 6111 & 61TP models add 0.61) t`') (W) valve Length, _ • '. bottom of From the tank calibration chart provided by tank manu- M cut M facturer find the dipstick number (Y) which corresponds to the 100% volume.ORIN it (B) To Tank (Y) 1 . To determine shut-off percentage: to Tank Subtract upper tube length (D) from distance to tank (U) Valve Chart bottom (B) Length, .� 100% (X) _ (B) — ( D) - 2" _ 6 g `" C63 � i = b y top of cut Volume Dipstick Using the tank calibration chart provided by the tank manufacturer determine the tank capacity at the cal- culated (Xj dimension and the 100% volume (Y) tank capacity, (X) tank capacity in gallons = q $ 5^ (Y) tank capacity in gallons = . _1 X65 _ SO% = (X) capacity / (Y) capacity x100 Note. The overfill valve must be installed per AH1 require- ments and all applicable local, state, and national codes . If L? / o O _ 9 q - S6 the overfill valve is set above the allowable shut-off percent- 10361 D �6 � — 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%.