Emerson Exchange 365

Activity

Commissioning Control Systems – Control Response

Terry Blevins and Greg McMillan

In many processes, it is desirable to have an overdamped response. To achieve that response, the proportional gain used in the PID is typically much less than that required for an underdamped or unstable response. When selecting the PID gain, it is important...
- 22 Aug 2011
Updated Batch Redundancy Product Data Sheet

Larry Griffin

Eliminate a single point of failure in your system with redundant Batch Executives and no longer worry about interrupting your batch operations and causing costly downtime. (171KB PDF) Read the full text.
- 22 Aug 2011
Updated OPC Data Access Server Redundancy Product Data Sheet

Larry Griffin

Provides a fast and efficient means for transferring data between the DeltaV system and OPC Data Access client applications. (400KB PDF) Read the full text.
- 19 Aug 2011
Effect of Mechanical Design – Equipment

Terry Blevins and Greg McMillan

There are numerous examples where equipment design by not taking into consideration dynamics caused poor control. A good equipment design should reflect an understanding of how dynamics affect control loops and the efficiency and capacity of the production...
- 18 Aug 2011
Commissioning Control Systems – Process Interaction

Terry Blevins and Greg McMillan

In many applications, the process equipment is characterized as having multiple manipulated inputs. This type of equipment configuration is often referred to as a multiple input/multiple output process. The process control consists of multiple PID blocks...
- 15 Aug 2011
PID World Tour--The Final Performance

Gregory K McMillan

Read the Conclusion of McMillan, Weiner and Congiundi's Tour of PID World Read the full text.
- 15 Aug 2011
Effect of Mechanical Design – UA

Terry Blevins and Greg McMillan

The product of the overall heat transfer coefficient and area (UA) determines the controllability of temperature processes. The deterioration of the UA is a particular concern for crystallization and polymerization processes. Frosting and fouling can...
- 11 Aug 2011
Commissioning Control Systems – Installed Characteristics

Terry Blevins and Greg McMillan

From a control perspective, it is highly desirable that the process gain be constant. If the process gain is constant, then the same proportional gain may be used over the entire operating range of the control loop. However, if for example the valve characteristic...
- 8 Aug 2011
Effect of Mechanical Design – Pumps and Piping

Terry Blevins and Greg McMillan

The increasing emphasis on saving energy and capital costs can lead to pump and piping designs that inadvertently cause a severe loss of turndown in flow loops and a significant increase in noise , delay, and lag in temperature and pH loops. The deterioration...
- 4 Aug 2011
Commissioning Control Systems – Resolution and Deadband

Terry Blevins

As addressed in my July 18th and July 25th blogs, to achieve best control performance, it is important that the final control element moves to a position that matches that requested by the control system. The minimum size of change in the PID output that...
- 1 Aug 2011
Effect of Mechanical Design – Mixing

Gregory K McMillan

Mixing changes the game. Mixing has a broad impact on disturbances, interactions, and noise. Mixing breaks paradigms on tuning, control, and performance. Mixing is at play in key unit operations offering incredible tightness of control and forgiveness...
- 28 Jul 2011
Commissioning Control Systems – Valve Performance

Terry Blevins

As addressed in my July 18th blog, when a valve positioner is installed on a valve actuator, as long as it is functioning properly it will automatically increase the actuator pressure until the valve moves to a position that matches that requested by...
- 25 Jul 2011
Top Ten Limitations – Analyzers

Gregory K McMillan

Ultimately what we most need to know in each key process stream is the operating condition least measured; composition. We are largely flying blind. Neural networks and projections to latent structure technologies have proliferated because online and...
- 21 Jul 2011
Commissioning Control Systems – Valve Positioners

Terry Blevins

When commissioning a control system, it is important to be aware of whether a regulating valve is equipped with a positioner. If a valve does not have a positioner, then as part of loop commissioning it may be necessary to install a positioner on the...
- 18 Jul 2011
Top Ten Limitations – Setpoints

Gregory K McMillan

A loop is only as good as its setpoint. Most loops are not operating at the best setpoint for 9 major reasons. For sustainable manufacturing we need to understand and address these reasons to achieve better setpoints to reduce the energy, raw material...
- 15 Jul 2011
Commissioning Control Systems – Input Filtering

Terry Blevins

The method used to process analog inputs and outputs is unique to each control system. Also, controller and IO bus design influence how often measurement and outputs are updated and thus dictate the control execution rate that is supported by the control...
- 11 Jul 2011
More Fun with PID Controllers

Gregory K McMillan

Exploring Just How Flexible and Powerful the PID Controller Can Be Read the full text.
- 11 Jul 2011
Top Ten Limitations – Turndown

Gregory K McMillan

Plant turndown determines how effectively a production unit can minimize inventory and energy costs. As utility rates change with supply and demand, energy efficiency changes with weather, and product demand changes with customer shipments and downstream...
- 7 Jul 2011
Stairway to Heaven

Bruce Greenwald

Many years ago, I was working a startup in Addis, LA and the process control technician explained to me the various titles for the operation’s staff. At the top of the food chain was the title AAGLB. I asked what it stood for. The reply was “Almost A...
- 5 Jul 2011
Commissioning Control Systems

Terry Blevins

The long-term performance of a plant is directly impacted by the care with which the control system is commissioned. Establishing control loop tuning is an important part of the work needed to commission a new plant or an area of the plant in which measurement...
- 4 Jul 2011
More Extraordinary PID Innovations

Gregory K McMillan

The Creative Use of PID Controllers for Process Improvement Read the full text.
- 13 Jun 2011
Skinning the Cat with XLReporter

Bruce Greenwald

At what point does control functionality requirements become just too complex to implement in the native control environment? It’s a tough call, because there are so many factors that go into the decision. Converting some massive calculation into the...
- 9 Jun 2011
Troubleshooting Help

Bruce Greenwald

Not that you need another reason to upgrade your DeltaV system to version 11, but there’s a way cool app in Windows 7 and Server 2008 R2 to enhance troubleshooting. It’s called Problem Steps Recorder or PSR for short. What PSR does is record your mouse...
- 26 May 2011
35 Years of Extraordinary PID Innovations

Gregory K McMillan

The Best Tuning of a PID Controller Is Knowledge of the Process Dynamics Read the full text.
- 12 May 2011
Ultimate Limits to Performance

Gregory K McMillan

Whether You Are Talking About Advanced PID Control or Model-Predictive Control, the Final Control Element Determine How Well You Can Achieve Your Control Objectives Read the full text.
- 11 Apr 2011

Emerson Exchange 365

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