Big Size 3 Inch 76mm Pall Ring Custom Material Random Packing
The metal pall ring random packing was developed by BASF company in 1940s on the basis of raschig
ring. It is made of sheet metal by punching and rolling. Two rows
of window holes with tongue leaves extending inside are opened on
the ring wall. Each row of window has five tongue leaves bending
into the ring, pointing to the ring center, almost connecting at
the center, and the upper and lower layers of window holes are
staggered with each other. Generally, the total area of the opening
is about 35% of the whole ring area. As a result of opening windows
on the ring wall, the distribution of gas and liquid in the packing
bed and the mass transfer performance are greatly improved compared
with that in the raschig ring. People have made plenty of study of
its performance, so pall ring is still one of the main random
packing used at present.
Metal pall ring's specification:
Size Dia.*Height (mm) | Thickness mm | Pack No. (m3) | Pack Density (kg/m3) | Specific Area (m2/m3) | Void Volume % | Dry Packing Factor |
| 16*16 | 0.3 | 214000 | 396 | 362 | 94.9 | 423 |
| 25*25 | 0.5 | 51940 | 393 | 219 | 95.0 | 255 |
| 38*38 | 0.6 | 15180 | 318 | 146 | 95.9 | 165 |
| 50*50 | 0.8 | 6500 | 314 | 109 | 96.0 | 124 |
| 76*76 | 1.2 | 1830 | 308 | 71 | 96.1 | 80 |
Pall ring takes an advantage that as random packing being mass
produced with standard elements, the delivery periods are
relatively short from storage. Because the pall ring can be used in
many applications regardless the size of columns, we hold a stock
of most types of random packings for fast delivery.
Random column packing is packaged and shipped by volume. A volume
adjustment factor must be applied to the calculated column.
Geometric volume to estimate the shipping volume required to
properly fill a packed bed to account for edge and settling
effects. The volume adjustment factor depends upon the packing
shape and size and the bed diameter.
Hualai pall rings are available in several sizes as indicated on
our design sheets to suit most commercial applications. They range
in size from 10mm to 76mm or equivalent. It is an essentially a
design consideration in specifying a packing size based on capacity
and efficiency requirements. The nominal packing size specified
should however not be greater than 1/10th of the column diameter.
The packing is usually specified in the lowest cost material of
manufacture that will satisfy temperature and corrosion
requirements. Some of the most common materials listed in order of
relative cost are:
Polypropylene (mainly aqueous systems up to 100 deg. C)
Carbon steel (non-corrosive hydrocarbon systems)
Ceramic (sulphuric acid & nitric acid absorbers)
Stainless steels (most hydrocarbon systems)
PVDF, PFA (corrosive aqueous systems up to 150 deg. C)
PVC / C-PVC (corrosive aqueous systems up to 90 deg. C)
SS316L metal pall rings in various sizes:
Welcome your inquiry with any questions!
