Flood-packings interpolation

The pressure drop through packed columns, and the flooding conditions, can be estimated from the generalized correlation of Leva (1992), shown in Fig. 13-5. The pressure gradient in millimeters of water per meter of packed height is the parameter on the curves, and interpolation is usually necessary to determine the pressure drop (note that the pressure... 

Kister and Gill compared flood-point predictions from Eq. (8.1) to their massive data banks for second and third-generation random packings (60) and for structured packing (60a). Pressure drops were calculated using the Kister and Gill GPDC interpolation charts (Sec. 8.2.9). They showed that Eq. (8.1) predicted all the flood points in their data bank to within 15 percent and most to within 10 percent. 

A weak link in the correlation is the packing pressure drop prediction. Inaccurate pressure drop prediction procedures will lead to inaccurate flood-point predictions using this correlation. For best results, the author recommends applying Eq. (8.1) together with pressure drop predictions by interpolation (Sec. 8.2.9). 

Chapter 10 presents a compendium of GPDC data interpolation charts for flood, MOC, and pressure drop prediction, both for random and structured packings. When flood data are absent, pressure drop data can be used for approximating the flood point using Eq. (8.1). 

Rgure B.1S GPDC interpolation plots for structured packings flood points, i.o) The Fair and Bravo plot for Sulzer BX and Mellapek 250Y. (Part a. from J. R, Fair and J. L, Bravo, I, Citem, E, Symp. Ser, No. 104, p. A183,... 

Which method to use, Data interpolation is generally the most accurate and should be preferred whenever flood data are available. Otherwise either if pressure drop data are available or when pressure drop can be reliably predicted, Eq. (8.1) is recommended. When the packing factor Fp exceeds 60, the Eckert correlation, Fig. 8.17 is recommended. At... 

Figure B.1B (Continued) GPDC interpolation plots for structured packings flood points, (b) The Billet plot for several structured packings (cj the Spiegel and Meier plot for Mellapak , (Part b from R, Billet, Packed Column Analysis and Design, Ruhr University, Bochum, 1989, reprinted courtesy of Ruhr University part e, from L. Spiegel and W. Meier, 1. Chem. E. Syrtip. Ser. 104, p. A203, 1987 reprinted courtesy of the Institution of Chemical Engineers (UK).)...

Figure 8.1 B (Continued) GPDC interpolation plots for structured packings flood points. (d) The Dolan, Hausch and Petschauer plot for Intelox 2T Structured Packing. (Port d. from G,W. Hausch, P. Quvtson, and K. Seeger, Structured Packing Revamp of a 305 Psig Depropanizer, paper presented at the AJChE Annual meeting, Los Angeles, California, November 1991 reprinted courtesy of the Norton Company,)...

This chapter presents an atlas of charts for interpolating flood, pressure drop, and MOC. For random and grid packings (Charts 10.1002 to 10.3517 and 10.8005 to 10.8205), the charts are plots of the Eckert generalized pressure drop correlation (GPDC) curves, with experimental data superimposed on them. These plots permit data interpolation... 

Kister, H.Z. Larson, K.F. Gill, D.R. More interpolation charts for predicting packing flood and pressure drop. AIChE Spring National Meeting, Houston, TX, Mar 19-23, 1995. 

The determination of the flooding velocity in structured packings is best carried out by using interpolation of the flooding and pressure drop charts for individual structured packings in Chapter 10 of Kister (1992). 

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