January 2011

Columns

HP Control: Process control practice renewal—select CVs

I followed my April 2010 call for renewal of process control and IT practice with editorials on purpose in August, performance in October and consequences in December. Now I turn to selection of contr..

Latour, P. R., Clifftent Inc.

I followed my April 2010 call for renewal of process control and IT practice with editorials on purpose in August, performance in October and consequences in December. Now I turn to selection of controlled variables (CVs). How do we select CVs? Well, just how do we go about selecting operating conditions to be controlled about setpoints by manipulating valves? Why we do select particular flows, levels, pressures, temperatures, compositions, efficiencies, capacities and yields for measurement and stabilization about desired setpoints near limits? How do we determine the production, inventory, product quality, utility consumption and equipment limit setpoints? From the host of candidate ref

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