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( ALppendix B <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{AHA 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}= , � G '-,/ 4-1, <br /> - _% <br /> Distance from the 71SO inlet tube flange to the top and <br /> bot om of I weL tube,valvelenot. <br /> (D) j <br /> (U)_ & 163 Ile Tuber <br /> Distance from the 71 SO inlet tube flange to the bottom <br /> of the tank. mote:if a tank bottom protector is present it —may be necessary to add this thickness to dimension <br /> (OPW 61)1 &61Tp models add 0.6") (W)Valve <br /> ($)= C � 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. (13} <br /> (Y)= To Tank <br /> 1. To determine shut-off percentage: (Y) <br /> Tank <br /> Subtract upper tube length(D)from distance to tank (t!)Valve Chart <br /> bottom(8) Length, 100% <br /> (X}=(8)—(D)-2"= f C� Z f 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. i <br /> (X)tank capacity in gallons <br /> (Y)tank capacity g <br /> p ty in gallons= <br /> SCI1%=(X)capacity 1(Y)capacity x1 oo; �r <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 450,c. <br /> 21 <br />