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ARpendixB <br /> 71 SO Overfill Valve in Tank Shut off level Worksheet <br /> Imoor.M This is meant to be supplemental worksheet and not a substitute to following the Installation <br /> manual-insfru�tiflns. All eng Rmeasuremeni areT �c <br /> R �es,Wlease contact the Authority Having Jurisdic- <br /> tion IAHJ}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 /> Iug In the 71 SO body(see figures),upper tube length. <br /> Note: the Upper Tube Length must be at least 16"to In- <br /> dude the protective bend In the tube. <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube,valve length. iD? <br /> (1N) <br /> (U) Upper <br /> Tube <br /> Distance from the 7150 inlet tube flan a the bottom _ <br /> of the tank. Note:If a tank bo rote or is present it <br /> may be necessary to add this thickness to dimension <br /> (OPW 6111 UTP models add 0,6") W Valve <br /> (B)= J Length, <br /> bottom of i <br /> From the tank calibration chart provided by tank manu- cut <br /> facturer find the dipstick number(Y)which corresponds <br /> to the 100%volume. (el <br /> (Y)= To Tank <br /> 1. To determine shut-off percentage: (Y) <br /> Subtract upper tube length(D)from distance to tank Tank <br /> bottom{B} iUl Valve Chart <br /> ( I/ Length, 100% <br /> {X}=(B)-(D)-2"= f top of cut <br /> Volume <br /> Dipstick <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 ca ac'iq m gallons <br /> P i <br /> (Y)tank capacity in gallons= l7 Z 5 <br /> SO%=(X)capacity/(Y)capacity x100= L3-2"/u <br /> Note: The overfill valve must be installed per AW 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 overrilf <br /> valves should be set to a maximum of 95%. <br /> 21 <br />