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Appendix B <br /> 71 SO Overfill Valve in Tank Initial Shut off Level Worksheet <br /> Important: This is giant to be supplemental worksheet and not a substitute to following the installation <br /> manual instructio s. 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 hi 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 Zast S� <br /> lug in the 71 SO body(see figures),upper tube length. <br /> Note: the Upper Tu e Length must be at least 16"to in- <br /> clude the protective bend in the tube. r <br /> O I t <br /> (D)_ � f <br /> Distance from the 7 SO inlet tube flange to the top and1 <br /> bottom of lower tulz e,valve length. I (D) t ' <br /> {W)= Z " <br /> Upper <br /> (U)= Tube <br /> Distance from the 7 1 SO inlet tube flange to the bottom —,--L--_-1..----=�-� _�-.-------. --- <br /> of the tank. Note:If a tank bottom protector is present it I i 1 ti <br /> may be necessary tc add this thickness to dimension <br /> (OPW 6111 &61TPmmodels add 0.6") - �NI (W)ValveP to <br /> • ,� <br /> (B)— g Length, ti <br /> bottom of <br /> From the tank calibration chart provided by tank manu- L cut <br /> facturer find the dip tick number(Y)which corresponds CM� <br /> to the 100%volum . (B) <br /> (Y)= 2 31 To Tank � <br /> >t• M <br /> 1. To determineshut-off percentage: f I IN, Tank <br /> Subtract upper tubE length (D)from distance to tank + (U)Valve 4 ^I Chart <br /> bottom (B) �� Length, b0 100% ') <br /> (X)=(B)—(D)-2"= 1 8 2 -2=/0.3�i top of cut Volume <br /> Z 3 6 4'L Dipstick 11 <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 I �� <br /> capacity. <br /> (X)tank capacity ir gallons= <br /> (Y)tank capacity ir gallons= tj 3 I ---- ----------.------_._-- <br /> 50%= (X)capacity/(Y)capacity x100= <br /> Note: The overfill valve must be installed per AHJ require- <br /> ments and all applicable local,state,and national codes. If <br /> 2.3l0}Z� — �, 0 the overfill valve is set above the allowable shut-off percent- <br /> ^ X OO 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 />