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Hi Al,s

I posted this thread before also, once again, i'm posting this question for expert views. we shutdown the refinery for annul trun arund and after inspecting the column I found two things.
NB: this have 40 trays.
1 Column feed tray was damage
2 odd trays down comers was bulged from tray 5~40

my question is why odd tray down comer bulged and only one tray can give this much effect on reboiler out let temperature.
Your views are highly appericated.
Thanks

Toor