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Structured packing is a family of corrugated internals engineered to maximize vapor-liquid contact surface area at lower pressure drop than trays or random packing. Four types cover the full range of process applications. Gauze is specified for deep vacuum and low liquid rate services where minimizing pressure drop per theoretical stage is critical. Knitted provides high mass transfer efficiency for small-diameter columns.
Sheet metal handles the widest range of vapor and liquid rates, with high-capacity corrugation geometry increasing column capacity 20 to 30% over standard packing. Grid is specified for fouling services including FCC fractionator pumparound zones, crude vacuum wash sections, and quench columns. TrayTec supplies and installs all four types to your column specification.
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Selection is driven by four factors: process service, liquid rate, pressure drop requirements, and fouling tendency. Gauze is selected for deep vacuum and low liquid rate applications where pressure drop per theoretical stage must be minimized. Knitted is used where high surface area is needed in small-diameter columns. Sheet metal is the standard choice for the broadest range of refinery and gas plant services including atmospheric and high-pressure distillation, absorption, and stripping. Grid is selected wherever fouling would foul or block the finer geometry of sheet metal packing, including FCC main fractionator pumparound zones and quench columns. Contact TrayTec with your column operating conditions to confirm the correct type for your application.
The high-capacity sheet metal packing uses curved corrugation angles, approximately 45 degrees through most of the packing layer transitioning to 90 degrees at the top and bottom of each layer. This eliminates the high pressure drop created at the interface between rotated standard packing layers, increasing column capacity by 20 to 30% over standard corrugation geometry at the same bed height and column diameter.
Yes. Structured packing is a common retrofit choice when a column requires increased throughput or improved separation efficiency without modifying the vessel shell. Sheet metal structured packing is the most common retrofit selection for refinery and gas plant columns. Grid packing is specified for retrofit into services where the existing structured packing or random packing is fouling and restricting column operation. Support grids, liquid distributors, and bed limiters must be reviewed and may require replacement as part of the retrofit scope. Contact TrayTec to assess your existing column configuration and confirm the retrofit specification.
