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-)-i '/� q-s,q�"o <br /> Aunendix 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 following the installation <br /> manual Instructions. All length measurements are In inches. Please contact the Authority Having Jurisdic- <br /> tion(AHA and revlewJocal,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)= (�o b 1f <br /> Distance from the 71 SO Inlet tube flange to the top and <br /> bottom of lower tube,wive length. <br /> ( (Df <br /> t 1 j Upper <br /> {Ul., S Tube <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 /> (OPW 6111 &61TP models add 0.61 (M Valve <br /> Length, <br /> bottom of <br /> From the tank calibration chart provided by tank manu- cut <br /> facturer find the dipstick number(Y)which corresponds <br /> to the 1009 vol me., (B? <br /> (y). 3 To Tank <br /> 1. To determine shut-off percentage: fYl <br /> Tank <br /> Subtract upper tube length(D)from distance to tank (U)Valve Chart <br /> bottom(B) 11 Length, 100% <br /> (X)=(B)-(D)-2"_ OL _ top of cut 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 capacity in gallons= Q <br /> (Y)tank capacity in gallons= 5 <br /> 0/o <br /> 5096=(X)capacity/{Y)capacity x100= ,ZO <br /> 96 <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 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 95%. <br /> 21 <br />