Comment. This calculation is based on data for nonfoaming systems. The calculated pressure drop is satisfactory, but the actual pressure drop would be somewhat higher due to the foaming tendency.

Efficiency check. HETP data will be compared with the calculated HETP (Sec. 9.4.4). Table 11.1 is searched for efficiency data on columns in similar service that contain random packings. The following data, extracted from Table 11.1 are relevant:

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