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. |