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Appendix B <br /> 71 SO Overfill Valve in Tank Initial Shut off Level Worksheet aC L <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 bodysee figures), <br /> ( 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) <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom n6 lower r!rho .,ol.,., I�n.yt4.I L& 1 <br /> f� <br /> :i� :in <br /> (U)= WIN 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") (1 (V1�Valve 1t <br /> (B)= 03 <br /> f? Length, s <br /> bottom of , <br /> From the tank calibration chart provided by tank manu- cut s� <br /> facturer find the dipstick number(Y)which corresponds <br /> to the 100%volume. (B) <br /> (Y)= 119,5/6 <br /> To Tank <br /> �i <br /> 1. To determine shut-off percentage: M <br /> Subtract upper tube length (D)from distance to tank Tank <br /> bottom (B) (U)Valve Chart <br /> (X)=(B)-(D)-2" t p ogtcut V000m�e <br /> -{ Dipstick <br /> Using the tank calibration chart provided by the tank <br /> manufacturer determine the tank capacity at the cal- I%1 <br /> culated(X)dimension and the 100%volume(Y)tank <br /> capacity. ? !1 <br /> (X)tank capacity in gallons <br /> � rf� <br /> (Y)tank capacity in gallons=. �"Skt <br /> Q ll <br /> SO%=(x)capacity/(Y)capacity x100 <br /> (Vote: The overfill valve must be installed per AM 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 /> 21 <br />