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Js� <br />ALpendix 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 fo[I wing 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 7150 body (see figures), upper tube length, <br />Note. the Upper Tube Length must be at least 16" to in- <br />ciude the protective bend in the tube. <br />1p) __ ��� <br />Dklanre from the 71 SO inlet tube flange to the top and <br />bottom of lower tube, vat ve lt=„gilt. <br />(W) = /7-0, U <br />(u)_� d-6 ---5 <br />Distance from the 71 So inlet tube flange to the bottom <br />of the tank. mote: If a tank bottom protector is present it <br />may be necessary to add this thickness to dimension <br />(OPW 6111 & 61 TP models acid 0.6") <br />(B) <br />Prom the tank calibration chart provided by tank manu- <br />facturer 5 n the dipstick number (Y) which rorresponds <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 (8) <br />(X)=(0)—(p)-2"=� �J <br />Using the tank calibration chart provided by the tank <br />manufacturer determine the tank capacity at the cal- <br />culated W dimension and the 100% volume M tank <br />capacity. <br />lX} tank capacity in gallons= S� <br />(Y) tank capacity in gallons <br />50% y tHj capacity/ (Y) capacity x100 <br />F <br />W <br />lf7i <br />� <br />Upper <br />Tube <br />i Mf}valve <br />[ Length, <br />f <br />bottom of <br />1� <br />cut <br />�f <br />To Tank <br />4' i <br />{Y} <br />Tank <br />M Valve <br />_ <br />Chart <br />Length, <br />top of cut <br />volume <br />4l <br />Dipstick <br />h <br />t' <br />Y� <br />L <br />I <br />Dote, 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 6 Section 280.20overhll <br />valves should be set to a maximum of 95%. <br />27 <br />