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Advanced Process Control for the Refining and Petrochemical Industry
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Subject: Re: Column Pressure Control
Author: Zak Friedman
Date: 8/11/2011

Dear pressure control questioner, The simple answer is: the strategy of column-accumulator delta pressure controller destabilizes this system. If you control column pressure on condenser inlet (or outlet) valve, and accumulator pressure on hot vapor bypass it would be more stable. This topic has been addressed in a June 2008 HPJ article, please follow the link below. http://www.petrocontrol.com/editorials/2008%20HP0608%20Control%20June.pdf Hope you find it useful, Zak Y. Zak Friedman, PhD www.petrocontrol.com
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