Voices: Lipták

Controller Action and Positioner Rules

Two of Our Readers Ask Our Experts to Clarify Their Views on Controllers and Positioner Rules

By Bela Liptak

*Q:* I am an instrumentation engineer working for a EPC company in Dubai, UAE. I follow your articles closely. I have a query about one of your replies to the query on the subject of direct and reverse controller action. My understanding is that the controller action should be decided based on the control valve failure position, plus the process requirements, while the control valve failure action position is decided independently, considering only the safety requirements. I am still skeptical about the controller action. Can you please review my paper and help me? I tried to get this concept from books and the Internet, but nowhere is it complete.

Read more

More from this voice

Title

Pumping Station Optimization - Part 2

Bela Liptak Talks About the Phenomenon of Net Positive Suction Head (NPSH) and Multiple Pump Stations

01/08/2010

Pumping Station Optimization - Part 1

Liptak Describes the Pumping Process to Then Show How to Control and Optimize Pumping Stations

11/03/2009

Process Control's Role in Nuclear Waste Handling

Liptak Talks about the Role of Process Control in Nuclear Safety and How It Can Plays in Reducing the Risks Associated with the Transportation and Storage of Nuclear Wastes

09/11/2009

Chernobyl Did Not Need To Occur

Good Process Control Could Have Prevented this Historic Meltdown

07/12/2009

What Caused the Three Mile Island Accident?

Liptak Describes the Sequence of Events and the Primitive Controls That Led to the Three Mile Island Accident

05/11/2009

The Future of Nuclear Energy

If Global Carbon Emissions Were Cut by 15% by 2050 by the Increased Use of Nuclear Power, 1,070 Plants Would Need to Be Built at a Cost of $5 Trillion.

03/02/2009

Nuclear Security, Part II—Fission Basics

The Overall Topic of the Nuclear Power Plant Operation and the Use of Process Control to Protect Against Nuclear Accidents

01/09/2009

Nuclear Plant Security and Cyber Terrorism

How To Improve Nuclear Power Plant Security

10/28/2008

Controlling the Post-Oil Energy Economy

The World’s First Solar-Hydrogen Demonstration Power Plant

08/20/2008

Fuel Cell of the Future

Process Control Will Play a Key Role In the Transition From the Fossil/Nuclear Economy to the Solar-Hydrogen Economy of the Future

07/01/2008

Green Energy Can Stop Recession

Storing Solar Energy for the Night

05/04/2008

The Third Industrial Revolution

The Transition to a Solar/Hydrogen Economy Will Trigger an Economic Boom Unseen Since the Marshall Plan.

03/07/2008

Distillation Control and Optimization – Part 7

Plant-Wide Optimization Involves Coordinating the Control of Distillation, Furnaces, Compressors, etc. to Maximize the Profitability of the Entire Operation

01/03/2008

On the Road to Renewable Transportation

The OECD estimates that replacing 10% of the country’s motor fuels with bio-fuels would use one-third of all croplands.

11/06/2007

The Global Energy Future – Part 5

Covering 10 million American homes with solar roofs would trigger the biggest economic expansion of the decade.

08/31/2007

Distillation, Part 5: Multiple Products

In Part 5 of this series on distillation control and optimization, we find that adding a side-stream component to your process gives an additional degree of freedom, but makes it even more essential to not mismatch the variables.

08/01/2007

The Energy Future—Process Control’s Role

Find out about the “zero energy home of the future” and the hydrogen economy. What are the potentials of process control in wind, ocean wave, and geothermal energy systems.

07/12/2007

The global energy future – Part 3

Control's own Béla Lipták continues his series on the future of global energy, stating that in order to obtain maximum energy recovery, the various solar collectors described all need to track the sun.

05/07/2007

Control of the solar-hydrogen plant

Columnist Béla Lipták describes equipment and control requirements of the solar-hydrogen demo power plant and says we now are in critical need of them because the stakes are even higher.

03/01/2007

The power of the Sun: Part 1

In discussing global energy issues, CONTROL columnist Béla Lipták, PE, estimates that global warming damage will consume as much as 20% of the global GDP by 2020 even without energy wars.

01/05/2007