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Appendix B <br /> 71 SO Overfill Valve in Tank Shut off level Worksheet <br /> lmgoMM This is meant to be supplemental worksheet and not a substitute to following the Installation <br /> manual instructions. All length-measurements are-Th-inches. Ofease contact the_Aerthority Havin-g 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)_ Sly <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube,valve length. <br /> (W)=- I q`3 (D) <br /> (U) Upper <br /> Tube <br /> Distance from the 7150 inlet tube flan a the bottom <br /> of the tank. Note:If tank bo rot or Is present it <br /> may be necessary to add this thickness to dimension <br /> (OPW 6111 &61TP n)odels acid 0.6') W Valve <br /> (B)= 2 Y 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. (B} <br /> (Y)= To Tank <br /> 1. To determine shut-off percentage: M <br /> Subtract upper tube length(D)from distance to tank Tank <br /> N)Valve Chart <br /> bottom(B) , length, 100% <br /> (X)=(B)-(D)-2"= U S� 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= •I�U�� <br /> Note: The overfill valve must be installed per AR)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 90 CFR part 280 Subpart B Section 280.20 overfill <br /> valves should be set to a maximum of 95%. <br /> 21 <br />