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Appendix 6 <br />91 71 SO Overfill Valve in Tank Initial 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) _ <br />Distance from the 7150 inlet tube flange to the top and <br />bottom of lower tube, valve length. <br />(u) l co �' <br />Distance from the 7150 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 & 61TP models add 0.6') <br />(B) =l� --1 1; <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 />(Y)- i�q�l� <br />1. To determine shut-off percentage: <br />Subtract upper tube length {D) from distance to tank <br />bottom (8) <br />(x) = (B) _ (D) - 2 l�2.2 <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 rapacity in gallons = � 0 '6� "- .1 <br />(Y) tank capacity in gallons = 11 <br />SO% = (X) capacity/ (Y) capacity x100 = q � -10 <br />0'CIkI <br />---_. <br />I <br />f <br />I� <br />i <br />(D) i <br />i <br />Upper <br />Tube <br />f� <br />r <br />I; (W) Valve <br />{j Length, ` <br />bottom of <br />I cut <br />(B) <br />To Tank <br />Tank <br />(U) Valve _ Chart <br />Length, 100% <br />top of cut Volume <br />Dipstick <br />Note: The overfiI I valve must be installed per AHJ require- <br />ments and all applicable focal, 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 45%. <br />21 <br />