When a variability problem emerges in a production process, the first suspect is often to look at the tuning of PID [proportional-integral-derivative] loops. While adjustments can be easily made in most automation systems, this is often not the source of the problem....
Variability in a process can impact unplanned downtime frequency, product quality, energy usage and more. I received some questions about measures of control performance from a reliability specialist in a refinery. I thought that these questions and answers I received...
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