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fi <br /> 71 SO Overfill Valve in Tank Shut off Level Worksheet <br /> tMR9qant; 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 tl^e 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 /> T <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lowrr tube.valve length. <br /> �D) <br /> (W) upper <br /> Tube <br /> (U) <br /> Distance from the 71 SO inlet tube flange to the bottom <br /> of the tank. Note:if a'Lank bottom protector is present it <br /> may be necessary to add this thickness to dimension <br /> �'OPW 6111 &61 TP models add 0.6") (W Valve <br /> L14LXL_ Length, <br /> (W V <br /> ,D' <br /> ,,P�r <br /> Tube be <br /> Valve <br /> Length, <br /> bottom <br /> ottom of <br /> From the tank calibration chart provided by tank manu- cut cut <br /> i <br /> facturer find the dipstick number M which corresponds <br /> to the 100%volume. r1B! <br /> To Tank <br /> (Y) 6 <br /> Y) <br /> 1. To determine shut-off percentage: Tank <br /> Subtract upper tube length(D)from distance to tank (U)Valve <br /> Chart <br /> bottom(B) Length, 1100% <br /> M=(8)-(0)-2" 00 top of cut Volume <br /> Dipstick <br /> Using the tank calibration chart provided by the tank i <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= Z-10, <br /> 50%=(X)capacity t(Y)capacity x 100 <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 overhil valve must be removed and replaced. For <br /> reference 40 CFR Dart 280 Subpart B Section 280.20 overfill <br /> valves should be set to a maximurn of 95*. <br /> . 21 <br />