Common Terms Associated With Plastic Random Packing
Random Packing: Also referred to as dumped packing. These are individual pieces of packing of a specific configuration which are randomly packed into a column. Material of construction for random packing may be plastic, metal or ceramic.
Mass Transfer: The movement of mass from one phase to another.
Scrubbing: Removing a contaminate from a gas stream.
Air Stripping: Removal of a contaminate from a liquid stream.
Injection Molding: The shaping of plastic parts by injecting heated resin into a mold.
Packing Configuration: Refers to the specific shape and style of plastic random packing such as the Tri-Pack, Pall Ring and Saddle style packing.
HTU: Height of Transfer Unit. The height of packing which gives a change in composition equivalent to one transfer unit and is a direct measure of column efficiency.
NTU: Number of Transfer Units. This is a measure of difficulty of separation.
Geometric Surface Area: Refers to the total physical area packing upon which mass transfer can take place. Typically measured in (FT2/FT3). Example the Kempac 2” Tri-Pack has a geometric surface area of 48.
Wetting: The wetting qualities of a specific tower packing refers to its ability to provide adequate area for liquid and gas contact. Material of construction also plays a part in this.
Liquid Distribution: Refers to a random packing’s ability to evenly distribute liquid through the packed bed section of a column.
Packing Factor: Established performance evaluation for a specific random packing style and size.
Void Space: Is the actual open area or space of a specific configuration or style of random packing. Example: The Kempac 2” Pall Ring has a void space of 92%.
Fouling: Build-up of sediment on individual pieces of random packing or in packed beds.
Settling: Refers to the tendency for some random packing styles to not uniformly sit in a packed bed resulting in a shorter packed bed than originally designed.
Nesting: Refers to void spaces created in packed beds buy some types of pacing due to their design. The Tri-Pack is specifically designed to avoid this.