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Tank ID: REG. <br />(X) tank capacity In gallons = 18478 <br />20 <br />{Y) tank capacity In gallons = 19703 <br />SO% = (X) capacity / (Y) capacity xl 00 = 939 <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 />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 B Section 280.20 overfill <br />valves should be set to a maximum of 95%. <br />From the tank calibration chart provided by tank manu­ <br />facturer find the dipstick number (Y) which corresponds <br />to the 100% volume. <br />fY)= 19703_______ <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 <br />include the protective bend in the tube. <br />(D)= 75-5_________________ <br />Distance from the 71 SO inlet tube flange to the top and <br />bottom of lower tube, valve length. <br />(W)= <br />(U} = <br />Distance from the 7ISO 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 0.6') <br />(B)=l81_______ <br />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 />1. To determine shut-off percentage: <br />Subtract upper tube length (D) from distance to tank <br />bottom (B) <br />(X) = (B) - (D) - 2" = 103-5 <br />(U) Valve <br />Length, <br />top of cut <br />(Y) <br />Tank <br />Chart <br />100% Vol­ <br />ume Dip­ <br />stick <br />(B) <br />To Tank <br />(0) 1 <br />Upper <br />Tube