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71 SO Overfill Valve In Tank Shut off Level Worksheet <br /> Irttportant: 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 #udsdlc- <br /> tlon (ANA and review local, state, and national codes to determine the regulatory requirements governing <br /> shutmoff capacity in your region, as well as take into account other considerations such as extreme tank ViL <br /> 'fake the following measurements with the valve In- <br /> stalled In the tank: <br /> Distance from the 7150 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 /> elude the protective bends the tube. <br /> (D) w 'b�! I <br /> Distance from the 71 SO inlet tube flange to the top and �rm"T <br /> bottom of lower, bg,rvalve length . <br /> (W) = (a) <br /> (U) = 10 r Upper <br /> Tube <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 0.61 (W) Valve <br /> (B) MM _� length, <br /> bottom of <br /> From the tank calibration chart provided by tank manu- cut <br /> facturer find the dipstick number (l) which corresponds <br /> to the 100°6 volume. (B} <br /> To Tank <br /> 1 . To determine shut-off percentage: (Y) <br /> Subtract upper tube length (D) from distance to tank (U) Valve Tank <br /> Chart <br /> bottom (B) ,� + � Length, 1 096 <br /> � � 9 <br /> ( ) A (B) - ( D) 2" _. s ) top of cut Volume <br /> Dipstick <br /> Using the tank calibration chart provided by the tank <br /> manufacturer determine the tank capacity at the cal® <br /> culated ( ) dimension and the 100% volume (Y) tank <br /> capacity, <br /> (lt) tank capacity In gallons = A4C) 1-° <br /> (Y) tank capacity in gallons = � 11 1Z1 _ <br /> 50°6 = (X) capacity ! (Y) capacity x100 <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 8 Section 250.20 overfill <br /> valves should be set to a maximum of 95%. <br /> 21 <br />