Generalized Pressure Drop Correlation

X = Abscissa of Smith-Dresser-Ohlswager correlation, or abscissa of Norton Generalized Pressure Drop Correlation, or Fluor vessel sizing separation factor or evaporator temperature, °F... 

Figures 9-21B and -21C are the earliest generalized pressure drop correlations (GPDC) proposed and have been used for many industrial plant design. Progressively, Figures 9-21E-H are more recent correlations. These charts will be discussed in a later section.

Figure 9-21B. Recent generalized pressure drop correlation. Note v = viscosity of liquid in centipoise. Used by permission of Norton Chemical Process Products Corp.

Figure 9-21F. Strigle s latest generalized pressure drop correlation. Note G = gas mass velocity, Ib/ft -sec. Used by permission of Strigle, R. F. Jr., Packed Tower Design and Applications Random and Structured Packings, 2nd ed. Gulf Publishing Co., (1994) p. 19.

Figure 9-21G. Generalized pressure drop correlation for non-foaming systems for IMTP metal random packing. Parameter of curves is pressure drop in inches of water/foot packed height. Numbers in parentheses are mm of water/meter of packed height. Used by permission of Norton Chemical Process Products Corp., Bull-IHP-1, 12/91 (1987).

Y = ordinate in the generalized pressure drop correlation, = G F tl)UL°-2/pGPLgc u = viscosity, centipoise p = density, Ib/ft ... 

Figure 8-11. Alternate generalized pressure drop correlation.30... 

Even an approach based on the traditional Generalized Pressure Drop-Correlation (Figure 6.2-1) seems doomed, because high-pressure duties show pressure-drops two to three times higher than predicted by such a correlation [17, 32],... 

FIG. 14-58 The Robbins generalized pressure-drop correlation. (From L. A. Robbins. Chem Eng. Progr., May 1991. p. 87, reprinted courtesy of the American Institute of Chemical Engineers.)... 

Figure 3.9 Generalized pressure-drop correlation, upper and lower curve limits. (From J. S. Eckert, Design Techniques for Sizing Packed Towers, Chem. Eng. Progress 57(9), 1961. Used by permission of Chemical Engineering Progress.)...

FIGURE 16 Generalized pressure drop correlation of Strigle21. Cs = flow parameter = Us[pg/(pL - Pg)]0 5, ft/s. Fp = packing factor, ft-1, v = kinematic viscosity of liquid, centipoises/specific gravity. 

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... 

Estimating flood and pressure drop using the GPDC interpolation charts involves data interpolation and extrapolation within the framework of the generalized pressure drop correlation (GPDC) chart (Fig. 8.196 or c), This technique is expected to yield reliable estimates when appropriate data are available in the vicinity of the operating point. The reliability of the estimates will diminish with the extent to which extrapolation is required. Whenever extensive extrapolation is required, the estimates are unreliable, and the calculation is best abandoned. 

The GPDC (generalized pressure drop correlation) interpolation charts are all numbered in the chapter number (10) followed by a 4-digit suffix. The four digits stand for the following... 

Schmidt minimum wetting, 513, 514 Schmidt humber, 528. 531 Sherwood-Eckert generalized pressure drop correlation (GPDC), 479-481. 486. 493, 504-506 Sherwood number, 529, 531 Shiras et al. distributed component. 110... 

Calculate the tower diameter. Various methods are available for the design and rating of packed towers. The method shown here is an extension of the CVCL model, which is more fundamentally sound than the generalized pressure drop correlation (GPDC). The basic flooding... 

Figure 11.46. Generalized pressure drop correlation, adapted from a figure by the Norton Co. with permission.

The column cross-sectional area and diameter for the selected pressure drop can be determined from the generalized pressure-drop correlation given in Figure 11.46. 

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