Pall Rings
|
Pall rings are an industry standard 2nd generation random packing. This shape is the most common both in plastic and metal.
Compared to raschig rings, pall rings offer significantly more capacity (throughput) and lower pressure drop. The efficiency is also greater.
| Pall Rings | Nominal Size | in. | ⅝ | 1 | 1½ | 2 | 3½ |
|---|---|---|---|---|---|---|---|
| Metal | Surface Area | m2/m3 | 340 | 207 | 132 | 102 | 59 |
| Packing Factor | m-1 | 230 | 177 | 144 | 86 | 56 | |
| Plastic | Surface Area | m2/m3 | 322 | 190 | 122 | 98 | 65 |
| Packing Factor | m-1 | 318 | 186 | 119 | 77 | 45 |
Saddles
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Saddles are also a 2nd generation random packing and were originally developed in ceramic material as an improvement to raschig rings, giving lower pressure drop and better liquid distribution.
In ceramic material the saddle shape is still the most popular, but in metal or plastic they offer no significant advantages compared to pall rings.
| Saddles | Nominal Size | in. | ½ | 1 | 1½ | 2 | 3 |
|---|---|---|---|---|---|---|---|
| Ceramic | Surface Area | m2/m3 | 620 | 260 | 190 | 120 | 90 |
| Packing Factor | m-1 | 656 | 330 | 170 | 131 | 72 | |
| Plastic | Surface Area | m2/m3 | 187 | 92 | 65 | ||
| Packing Factor | m-1 | 125 | 79 | 52 |