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Appendix B <br />71 SO Overfill Valve in Tank Shut off Level Worksheet <br />Important: 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 Jurisdic- <br />tion (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 tank: <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) = -j, '-1 <br />Distance from the 71 SO inlet tube flange to the top and <br />bottom of lower tube, valve length. <br />(W) = k ti') <br />(U) = k1.l <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 &i 1T1 models add 0.6") <br />From the tank calibration chart provided by tank manu- <br />facturer find the dipstick number (Y) which corresponds <br />to the 100% yolume. <br />(Y) <br />1. To determine shut-off percentage: <br />Subtract upper tube length (D) from distance to tank <br />bottom (B) � � �/ <br />(X) = (g) - (D) - 2 t <br />Using the tank calibration chart provided by the tank <br />manufacturer determine the tank 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 = 14 f Z/,3 - <br />SO% = (X) capacity / (Y) capacity x100 = �; Y, ` <br />(D) <br />Upper i <br />Tube <br />i <br />(1M Valve 5,ti <br />Length, <br />bottom of <br />cut <br />(B) <br />To Tank <br />(Y) II� <br />Tank <br />(U) Valve Chart <br />Length, 100% <br />top of cut Volume 11 <br />Dipstick <br />Note: The overfill valve must be installed per AM 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 B Section 280.20 overfill <br />valves should be set to a maximum of 95%. <br />21 <br />