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A e be <br /> 71 SO Overfill Valve In Tank Shut off Level Worksheet <br /> lgrtant; 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 .Mrlsd1c- <br /> tlon (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 tante <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 7150 inlet tube flange to the top and <br /> bottom of lower tube valve length . (p) <br /> (W) = � �o 6SUpper <br /> (U) Tube <br /> Distance from the 71 SO Inlet tube flange to the bottom -• • - ~ --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& 61TP models add 0 .6") s , (W) Valve <br /> "moi Length, <br /> (0) ' --- -- "NEWS--� -- St" bottom of <br /> cut th <br /> From the tank calibration chart provided by tank manu� i <br /> facturer find the dipstick number (Y) which corresponds <br /> to the 100% volume�. (B) <br /> (Y) To Tank <br /> (Y) <br /> 1 . To determine shut-off percentage: Tank <br /> Subtract upper tube length (D) from distance to tank (U) Valve Chart <br /> bottom (S) Length, 100% <br /> (X) = (i3) - ( D) - 2" = r O+( — �o "Z- ^ [ d� top of cut Volume <br /> Dipstick <br /> Using the tank calibration chart provided by the tank <br /> manufacturer determine the tante capacity at the cal- <br /> culated (X) dimension and the 100% volume (Y) tank <br /> capacity. <br /> (X) tank capacity in gallons = . . (� _ <br /> .(Y) tank capacity In gallons = ? <br /> SO% = (X) capacity / (Y) capacity x140 q Y ' ISr 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 /> )< ! p O � -I- �"� age the overfill valve must be removed and replaced. For <br /> 4 �- 0 reference 40 CFR part 280 Subpart 8 section 280.20 overfill <br /> valves should be set to a maximum of 95%1 <br />