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Appendix $ <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 Haying 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 <br />include the protective bend in the tube. <br />(D) = <br />Distance from the 71 SO inlet tube flange to the top and <br />bottom of lower tube, valve length. <br />(W) _ <br />(V) _ <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 />(DPW 6111 & 61 TP models add 0.6") <br />(B) = <br />From the tank calibration chart provided by lank manu- <br />facturerfind the dipstick number (Y) which corresponds <br />to the 100% volume. <br />(Y) - <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" <br />Using the tank calibration chart provided by the tank <br />manufacturer determine the tank capacity at the cal- <br />culated (1C) dimension and the 100% volume (Y) tank <br />capacity. <br />(X) tank capacity in gallons = <br />(Y) tank capadty in gallons = <br />SO% = M capacity / {Y) capacity x1 AQ = <br />1 <br />31 <br />(D) <br />Upper <br />Tube <br />y <br />(W) Valve k <br />Length, <br />bottom of <br />cut <br />(8) <br />To Tank <br />M <br />Tank <br />(U) Valve Chart <br />Length, 100%Vol- 1 <br />top of cut ume Dip- <br />sxick <br />Note, The overfill vdive rnust be installed per AW req ulre- <br />ments and all applicable local, state, and national codes. If <br />the overfill valve is set above the allowable shut -oft 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 shoWd be Set to a maximurn of 9594. <br />20 <br />