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g� ,dux <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(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)— h <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube,valve length. <br /> (W)_ pp <br /> (U)_ Upper <br /> Distance from the 7150 inlet tube flange to the bottom Tube <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 A 61 TP models add 0.6") (VJ)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 100 volume, {i3} <br /> (Y)= To Tank <br /> 1. To determine shut-off percentage: (Y) <br /> Tank <br /> Subtract upper tube length(D)from distance to tank (l,i}Valve Chart <br /> bottom(B) Length, 100% <br /> (X)=(B)—(D)-2"= 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= <br /> (Y)tank capacity in gallons= <br /> SO%=(X) capacity/(Y)capacity x100 = Cl <br /> Note: The overfill valve must be installed per AHJ require- <br /> ments and all applicable lova state,and national codes If <br /> the overfill valve is set above the allowable shut-off percent- <br /> aQe the ave-fill.,aloe mist be removed and replaced For <br /> re`erence 40 CFR part 280 Subpart B Section 280 20 overfill <br /> valves sFould'be set tc a n-aximum of 950e <br /> 2' <br />