Page 301 - Applied Process Design For Chemical And Petrochemical Plants Volume II

290 Applied Process Design for Chemical and Petrochemical Plants

Table 9-26D
Glitsch Packing Factors for Cascade@’ Mini-Rings

Size Plastic Ceramic Metal
~
0 - - 55
OA 60 - -
1 29 - 40
1A 30 - -
1.5 - - 29
2 15 38 22
2A 30 - -
2B 18 - -
2c 19 - -
2.5 - - 19
3 11 24 14
3A 12 - -
4 - - 10
3 - 18 8
7 - 15 -
~- ~ -- -
Used by permission: Glitsch, Inc., Bull. 345

Table 9-263”
Nutter Ringm Random Packing
~. . -
~
Relative
Size Packing HEW
No. Pieces/F$ Ft2/Ft3 Lb/F$ % Void Factor** values
0.7 4,740 69 11.0 97.8 xx 0.72
1.0 1,900 51 11.1 97.8 30 0.83
1.5 760 38 11.3 97.8 24 0.94
2.0 383 29 10.8 97.9 18 1.00
2.5 250 25 9.0 98.2 xx 1.18
3.0 120 20 8.3 98.4 xx 1.40
~ -.
*Nutter uses their OMTI proprietary computer program and not the conventional GPDC Chart shown in Figures 9-21B-E.
**Values shown developed by Kister [go] from data supplied by Nutter Engineering Co., a Harsco Corp.
Used by permission of Nutter Engineering Co., a Harsco Corp.; Bull. NR-2

reducing the effective liquid density, and increasing the “dry” factors only. (See later write-up.) This factor is a
volume occupied by a given mass of liquid is increased. unique characteristic of each packing size and experimen-
This aeration effect can vary from 0.9 at atmospheric pres- tally determined style/design. These factors cannot be
sure for non-foaming liquids to 0.7 for hydrocarbon sys- determined by calculation from the physical dimensions,
tems (not absorbers operating at 35% of critical pressure). they are more accurately determined experimentally.
Kaiser [140] presents a correlation analysis for flooding Packing factor selection significantly affects the perfor-
in packed towers that is more analytical in the performance mance of a packed tower system. These factors are only
approach. It is based on single phase hydraulics. It would suitable for discreet particle type packing, and their values
have been helpful for the article to present a comparison of vary depending on how the packing is installed in the
results with the other more conventional techniques. tower. For example, the factors for a ceramic packing are
different for packing floated (dumped) into a tower full of
Packing Factors water and the particles allowed to float down when com-
pared to the same packing dumped into a dry empty tower
The use of “packing factors” is established in the design where significant breakage can occur and consolidate the
concepts of evaluating packed tower performance. Essen- packing, or even to packing “hand-placed or stacked dry.
tially all of the manufacturer’s published data are for “wet Often it is only necessary to change a packing size or
and dumped” packing factors, F. Robbins proposes using type to modify the capacity and/or contacting efficiency