Monthly Archive: February 2010

Feb
22

Exceptional Opportunities in Process Control – Flow and Level Measurements

Knowledge of the flows and the accumulation of material in a unit operation are fundamental to the understanding and analysis of process and equipment performance. Flows are the primary way of affecting the process. Root cause analysis requires sensitive and repeatable flow measurements. I have seen costly expert systems fail to deliver benefits because of …

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Feb
15

Exceptional Opportunities in Process Control – Adaptive Level Control

The tuning settings of many level loops aren’t in the ball park. The result is persistent oscillations that spread throughout the process. Level loops frequently manipulate feed flows to process operations. Variability in these feed flows causes variability in the temperature and composition in equipment whose process loops end up chasing continual changes in feed. …

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Feb
05

Exceptional Opportunities in Process Control – Middle Signal Selection

This piece could have been titled “Exceptional Failures in Process Control.” Despite my 25 years of explaining the importance of using middle signal selection, I don’t see much evidence of what I have said has taken root outside of Monsanto and its spin-off Solutia, where it became a part of the culture and best practices …

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