PackCol performs hydraulic designs for new packed columns or rating calculations for existing columns and towers. The design basis can be approach to flood, maximum capacity or pressure drop. Includes a database of packing types, but custom data can be used. The Eckert and Robbins correlations are included to cover the full flowrate range. Results can be printed in tabular form, and plotted as a Generalised Pressure Drop Correlation diagram or as an Operating Diagram. Uses Imperial or Metric units. Detailed manual and tutorial included in Acrobat format.