Posts Tagged ‘PID loop’

How to Identify Simple Process Dynamics

Posted in Education, Process Optimization on Tuesday, July 23rd, 2013. No comments yet
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The subject of process dynamics can get quite involved and cause many to shy away from it. Emerson’s Felipe Fakir, a systems engineer based in Brazil, has written a whitepaper, Process Characterization, to make the topic more approachable—at least in how to identify simple process dynamics. He opens introducing the process variables used in a [...]

Steps to Effective PID Loop Tuning

Posted in Distillation Column, Education, Process Optimization on Thursday, February 14th, 2013. No comments yet
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Sometimes when you read an article about tuning proportional-integral-derivative (PID) loops, you’re treated to all the 2nd order differential equations they contain. These can be intimidating, especially if your college calculus classes are many years in the rearview mirror. If you find yourself in this situation, there’s a great Chemical Engineering Progress article, Implement an [...]

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Getting the Converted PID Values Right

Posted in Modernization on Friday, February 1st, 2013. 3 comments so far
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I received an interesting story from Emerson’s James Beall about a process manufacturer with a process filled with many fermentors. They were being converted over from Provox control systems to DeltaV systems. pH control was a key part of the plant’s fermentation process. The first two fermentors were converted over but were now cycling. The [...]

Tuning Integrating Process Loops

Posted in Process Optimization, Variability Management on Thursday, November 15th, 2012. 4 comments so far
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Earlier this week, I highlighted a presentation by Emerson’s James Beall, Fundamentals of Modern Loop Tuning. I shared his approach for tuning self-regulating loops and the sequence to tune interacting loops. Today, I’ll share some guidance from the portion of the presentation on integrating processes. An example of an integrating process is a tank level. [...]

How to Tune Self-Regulating Control Loops

Posted in Education, Process Optimization on Tuesday, November 13th, 2012. 2 comments so far
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I’ve highlighted a few Emerson presentations for this week’s ChemInnovations conference in New Orleans. Emerson’s James Beall, a 30-year veteran in process control and chairman of the ISA 75.25 committee on control valve performance testing, shared his ChemInnovations presentation with me as well. The subject is a look at the fundamentals of modern loop tuning. [...]