Flooding is creating due to high pressure drop creating in the column during flooding condition Tower efficiency fall to lower value.when down comer and space between the tray are completely filled up by liquid then tower is said to be flooded due to high pressure drop and due to increase flow rate of stream.
2.)Priming:-
During gas liquid contacting a foam is created and that foam carried liquid from one tray to tray above that is result in carried liquid recirculate between trays and the liquid handling load is increase & it increase gas pressure drop which create a flooding.to prevent this condition gas velocity are increase this condition are known as priming.
3.)Coning:-
In coning condition gas liquid contacting is poor due to low liquid rate and rising vapor pushes the liquid back from top of holes.
4.)Weeping:-
It is condition in which vapour flow rate is too low enough to hold All the liquid on the tray so that part of liquid comes from openings in the tray.
5.)Dumping:-
It is condition caused by low vapour (gas) flow rate some part of liquid comes out from opening in tray and vapour passed through remains holes.
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