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California Stop-91 <br /> Appendix B <br /> 71 SO Overfill Valve in Tank Initial 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)= 46" li <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 /> (U)= Tube <br /> Distance from the 71 SO inlet tube flange to the bottom j <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 0.6") j (W)Valve <br /> (B)= 141" Length, <br /> bottom of <br /> From the tank calibration chart provided by tank manu- L cut <br /> facturer find the dipstick number(Y)which corresponds ! _, <br /> to the 100%vol ume. (B) <br /> (Y)= 92" To Tank <br /> I �'I <br /> M Ij <br /> 1. To determine shut-off percentage: i Tank <br /> Subtract upper tube length (D)from distance to tank M Valve Chart i; <br /> bottom (B) I Length, 100% <br /> (X)=(B)—(D)-2"=83" top of cut Volume <br /> Dipstick ; <br /> Using the tank calibration chart provided by the tank j <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= 11,077 + <br /> (Y)tank capacity in gallons= 11,627 �.�__ _ _ - <br /> SO%=(X)capacity/(Y)capacity x100= 95% <br /> Note: The overfill valve must be installed per AM require- <br /> ments and a'I applicable local,state,and national codes. If <br /> the ovnrfll 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 />