Monthly Archive: April 2007

Apr
30

A Funny Thing Happened on the Way to the Control Room

From the 1980s to the present I decided to have some fun and add humor to the world of process control literature. The result was a series of books How to Become an Instrument Engineer – The Making of a Prima Donna A Funny Thing Happened on the Way to Control Room How to Become …

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Apr
19

Valves that can Turn on a Dime, or at Least a Quarter – Part II

In my younger days I was presented with the critical need to make air compressor surge and electrical phosphorous furnace pressure control loops able to handle very abrupt and extreme disturbances. I vastly prefer the present to that present. These applications offered more excitement than engineers should be allowed to have. The compressors provided the …

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Apr
09

Valves that can Turn on a Dime, or at Least a Quarter – Part I

I have seen some of the best and the worst of control valves. I have also found out that not all positioners are created equal and responsible responsiveness depends upon the whole package. Here is a checklist for making sure your valve is nimble enough to respond to every demand of your loop if you …

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Apr
02

Analog Control Holdouts

I have seen two control loops that did not go digital during the migration to a DCS. These electronic analog controllers stick out like a sore thumb in a modern day control room. The user would like to get rid of them along with the parts, maintenance, and operator interface issues. What keeps these relics …

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