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z <br /> 5 y Z j Appendix B <br /> 71 SO Overfill Valve in Tank Shut off Level Worksheet W <br /> Important This is meant to be supplemental worksheet and not a substitute to following the installation <br /> 00 <br /> manual instructions.All length measurements are in inches.Please contact the Authority Having Jurisdic- W <br /> tion(AHA and review local,state,and national codes to determine the regulatory requirements governing CD <br /> shut-off capacity in your region,as well as take into account other considerations such as extreme tank tilt. W <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 <br /> include the protective bend in the tube. <br /> (D)= u I <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)= A,4Tube <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 /> (DPW 6111&61 TP models add 0.6") (w)valve <br /> Length, <br /> bottom of t <br /> From the tank calibration chart provided by tank manu- cut y <br /> i <br /> facturer find the dipstick number(1)which corresponds <br /> to the 100%v 100,17Ve. (B) <br /> To Tank �yy <br /> (Y) <br /> 1. To determine shut-off percentage: Tank <br /> Subtract upper tube length(D)from distance to tank (u)valve Chart <br /> bottom(B) Length, 100%Vol- i <br /> (X)=(B)-(D)-2"= �� top of cut ume Dip- <br /> stick d <br /> Using the tank calibration chart provided by the tank I 1) <br /> manufacturer determine the tank capacity at the cal- 1 <br /> culated(X)dimension and the 100%volume(Y)tank <br /> capacity. (� <br /> (X)tank capacity in gallons= Z 7 y I <br /> (Y)tank capacity in gallons= <br /> � rt <br /> So%=(X)capacity/(Y)capacity x100= Z <br /> Note:The overfill valve must be installed per AW require- Mh <br /> ments and all applicable local,state,and national codes_R <br /> the overfill valve Is set above the allowable shut-off percent- n <br /> age the overfill valve must be removed and replaced.For 0 <br /> reference 40 CFR part 280 Subpart B Section 280.20 overfill (7 <br /> valves should be set to a maximum of 95%. O <br /> O <br /> 20 O <br /> LriW <br /> to <br /> N <br /> 00 <br />