Category Archive: Unit Operation Control

May
20

Surge Tank Control

Surge Tank Level Control

Intermediate liquid storage tanks (surge tanks) are commonly installed between processing areas of the plant. Under normal operating conditions, these storage buffers allow each process area to be operated independently of the other process areas. Any imbalance in the area production rates within a plant will be reflected by a change in level of the …

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Dec
10

Foundation Book Promotional Kit

Foundaton Book Display

The single loop and multi-loop control techniques most often used in automating continuous and batch processes are addressed in the book Control Loop Foundation – Batch and Continuous Processes. Similarly, the advanced control techniques that are most often utilized in the process industry are addressed in the book Advanced Control Foundation – Tools, Techniques, and …

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Oct
22

Continuous Data Analytics – Impact of Transport Delay

Continuous Digester

When developing a PLS models for quality parameter prediction, the deviation of measurement values from their mean must be shifted in time to account for the time required for a change in the input to impact the quality parameter. Similarly, these delays should be taken into account in the processing of the deviation values used …

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Oct
15

Continuous Data Analytics – Impact of Grade Change

Continuous Reactor Example

The process operating points of a continuous process can shift with changes in the product grade that is manufactured. One example of this is a continuous reactor in which the target for output composition changes with product grades. To change the output composition, it is often necessary to change the operating point of one or …

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Oct
08

Continuous Data Analytics – Quality Parameter Prediction

Swing Boiler Example

The prediction of quality parameters using Partial Least Squares (PLS) models is often the preferred technique when dealing with collinear data where multiple process input changes impact similar process output measurements. Predictions based on this linear technique can be used to extrapolate outside the data range used in model development. Process interactions may be accounted …

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Oct
01

Continuous Data Analytics – On-line Use

Data Analytics - Filling the Gap

One of the key objectives of a process control system is to maintain product quality parameters within specification. On-line analyzers that automatically provide measurements of material properties to the control system may be too expensive, may have proven to be unreliable, or simply may not be available because of the complexity of the sampling system …

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Sep
24

Continuous Data Analytics

ContinuousDataAnalyticsFieldtrailProcess

One of the areas addressed by the DeltaV future architecture team over the last two years has been the research and development of on-line continuous data analytics for fault detection quality parameter prediction. This year a prototype of this capability is being tested at two plants in Texas and one plant in Canada. Lubrizol, Deer …

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Sep
17

Control Loop Foundation Class – Nov 5-9

9025 Class

I worked closely with Emerson’s education department to establish the class Control Loop Foundation (9025). This 4 ½ day class is intended primarily for people who are new to the process industry and process control. Approximately 30% of the class is dedicated to workshops in which the students get hands on experience working with the …

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Sep
10

Advanced Control Foundation – Book’s Web Site

Advanced Control Foundation Home Page

A workshop is provided at the end of each chapter of Advanced Control Foundation – Tools, Techniques, and Applications that explores the technology. One of the unique features of the book is that the reader may view the workshop solution by going to the web site (http://www.advancedcontrolfoundation.com. ) that accompanies the book. All you need …

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Sep
03

Advanced Control Foundation – ISA Web Site

Advanced Control Foundation

Last week Mark Nixon, Willy Wojsznis and I completed the final type set review of Advanced Control Foundation – Tools, Techniques, and Applications. It is always a good feeling to reach this point when writing a book. As I mentioned in an earlier blog, Advanced Control Foundation – Tools, Techniques and Applications will be available …

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