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Appendix 6 <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 /> ( <br /> Note: the Upper Tube Length must be at least 16"to in- <br /> clude the protective bend in the tube. ^ <br /> . 1 <br /> (D)= ....._.... <br /> ..__ - <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube,valve length. ;D) <br /> (W) Upper <br /> Tube <br /> Distance from the 71 SO 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 &61 TP models add 0.6") I (W Valve <br /> (e)= 1 I Length, <br /> bottom of <br /> From the tank calibration chart provided by tank mane- cut <br /> facturer find the dipstick number m which corresponds <br /> to the 100%/volume. g <br /> (Y) To Tank \\ <br /> ` f <br /> t I � I <br /> 1, To determine shut-off percentage: v jDk <br /> Subtract upper tube length(D)from distance to tank (U)Valve <br /> bottom(B) Length,(X)=(B)-(©)-2" ��Li/ top of cut Using the tank calibration chart provided by the tank imanufacturer determine the tank capacity at the cal-culated(X)dimension and the 100%volume(Y)tank <br /> capacity. <br /> (X)tank capacity in gallons= <br /> 46 <br /> (Y)tank capacity in gallons= <br /> SO%_(X)capacity/(Y)capacity x1 oo <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 /> 211 <br />