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Appendix B <br /> 71 SO Overfill Valve in Tank Shut off Level Worksheet <br /> lmrtant: 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- t <br /> stalled in the tank: <br /> Distance from the 71 SO inlet tube flange to the cast IR <br /> lug in the 71 SO body(see figures),upper tube length. '! <br /> Note: the Upper Tube Length must be at least 16"to <br /> include the protective bend in the tube. <br /> (D) _ <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube,valve length. {D? <br /> (W)= <br /> (D)= Uper <br /> Tube <br /> Distance from the 71 SO inlet tube flange to the bottom 9 <br /> of the tank. Note:If a tank bottom protector is present it <br /> may be necessary to add this thickness to dimension 5 <br /> (OPW 6111 &61 TI'models add 0.6") (W)Valve <br /> (B)_ Length, <br /> bottom of <br /> From the tank calibration chart provided by tank mane- cut <br /> facturer find the dipstick number(Y)which corresponds <br /> to the 100%volume. {8) <br /> (Y)= To Tank <br /> 1. To determine shut-off percentage: M <br /> Subtract uppertube length (D)from distance to tank (U)Valve Tank <br /> chart <br /> bottom(B) length, 10056Vol- j <br /> (X)_(B)—(D)-2"= top of cut ume Dip- <br /> stick <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= <br /> Note: The overfill valve must be installed per AN requlre- <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 /> valve3 should be set too moxlmurn of 9596. <br /> 20 <br />