What is Pall Ring Packing and How Is It Used in Process Plants? Pall Rings are the similar Packing as Raschig Rings with windows and/or fingers only in addition to it. The development of Pall Rings was a huge replacement in random packing segment. By punching tabs in the wall of the ring, it created internal drip points which drastically increases capacity and efficiency by more than 50% over the Raschig Ring Packing. Like the Raschig Ring Packing, Pall Rings are characterized by having the same height as its diameter. Pall Rings are often used in absorption and distillation services. They are still widely used in the industry owing to their performance with good capacity characteristics at low- pressure drops. This adjustment provides a significant performance increase, resulting in an improvement of the capacity and efficiency. Pall rings also has been divided as metallic and plastic segment as per their application. Metallic Pall rings are made from heat resistant and chemical corrosion resistant plastic. That’s why, metallic type pall rings are mostly used in distillation columns, reaction towers, quench towers and other vessels. Metal pall ring is commonly applied to all sorts of decarbonisation and system of synthetic ammonia. Pall rings can be used for mass transfer operations that often includes stripping, gas scrubbing, de-aeration, biological filtration, degassing, and mechanical filtration.
How Pall Rings are used in Process? 1. Metallic Pall Rings As we know, the design of the pall ring is an inspired from the raschig ring design. The cylindrical dimensions are quite similar, however the metal pall ring has two rows of punched to form drips and fingers facilitating vapor flow. This adjustment provides a significant performance increase, resulting in an improvement of the capacity and efficiency. In addition, this adjusted design leads to overall reduction of the pressure drop throughout the column.