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Advanced Process Control for the Refining and Petrochemical Industry
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Subject: Re: Column Pressure Control
Author: Mr Mahesh Khanna
Date: 8/3/2011

The column pressure control is done by controlling the condensing duty of the overhead gas. There are various variants for total condenser pressure control. A Pressure Control valve in the vapor outlet line upstream of the condenser or downstream of the condenser controls the column pressure and a Pressure differential valve or hot bypass valve ensures that there is enough diffenertial pressure for the condensed liquid to flow from column to the reflux drum. Unless there is a specific requirement for the tight control of reflux drum pressure(NPSH requiremnet of the pumps), Reflux drum pressure can be a resultant of the condensation.
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