Type of column malfunction

Description of the malfunction

Mechanical

· Missing, collapsed and buckled trays

· Damaged demister pads, liquid and vapour distributors and packing.

· Partially damaged trays resulting from corrosion.

· Level control problems on chimney trays and base liquid level.

· Blocked down comers.

Process

· Bad liquid and vapour distribution in packing.

· Liquid holdup due to fouling and plugging.

· Foaming on trays, condensers, reboilers and accumulators.

· Superheated or subcooled feed or reflux

Flow rate

· Slight, moderate and severe entrainment.

· Weeping or dumping on trays

· Flooding or dry trays due to loading conditions.