January 2010

Letters to the Editor

Letters to the editor/Correction

  Advocating the abandonment of MPC Regarding Zak Friedman's three "HPIn Control" columns on APC designs for minimum maintenance in the June (p. 90), July (p. 13) and August (p. 13) 2009 issues o..

  Advocating the abandonment of MPC Regarding Zak Friedman's three "HPIn Control" columns on APC designs for minimum maintenance in the June (p. 90), July (p. 13) and August (p. 13) 2009 issues of Hydrocarbon Processing, I fully agree with Mr. Friedman's suggestions to prune multivariable controller (MPC) matrices in order to mitigate maintenance and operations difficulties. In many cases, I would go a step further and consider abandoning the MPC altogether in favor of revisiting what can be accomplished with well-designed DCS-level regulatory controls. In a surprising number of cases, this will result in more optimal and robust performance, while the demands of MPC go away altogeth

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