chemical plant

APC: What’s in an acronym?

I closed my first advanced control loops on a cat cracker debutanizer in 1980. The platform was Honeywell PMX computer control software running on a TDC 4500 mainframe on top of early-release TDC 2000 – a real workhorse combination for 20 or more years. The controls maintained the LPG product heavy key spec while maximizing […]

Print Friendly
Continue Reading · 5
101 Tips for a Successful Automation Career

Tip #30: Appearance Matters

I was working on a large project early in my career and due to a last-minute design change, I had to quickly fabricate a panel with a dozen three-way valves to allow Operations to manually control some equipment. I threw together a design and the contractor did a good job of procuring the panel and […]

Print Friendly
Continue Reading · 1
OEE Screen

Tapping Hidden Manufacturing Potential Using OEE

Overall equipment effectiveness, or OEE, is an indicator of the sum of three production measures: uptime, quality, and throughput. By monitoring OEE, companies can find hidden capacity, what some have called uncovering the “hidden factory.” OEE gives users a better view of how, why, and when stoppages or downtime occur, even if sub-second in nature. […]

Print Friendly
Continue Reading · 0
Chemical Plant

Simple, Model-Based Process Control

Nonlinear control techniques can be used for more efficient process operation Often, nonlinearity is the primary problem for single-input-single-output (SISO) chemical process control. One solution is to design the process for PID control success – for linear responses, or with large inventories to reduce interaction and temper upsets. However, design is an act of balancing […]

Print Friendly
Continue Reading · 0
Silver Cup

ISA technical publications excel in advancing automation industry knowledge

ISA’s reputation for providing automation professionals with the highest quality, unbiased technical information continues to grow. Just a few days ago, in late June, the 2013 Thomson Reuters Journal Citation Reports (JCR), a highly recognized quantitative ranking and comparison of professional journals, announced that ISA Transactions: The Journal of Automation earned its highest rating ever […]

Print Friendly
Continue Reading · 0
Security with Lock

Protecting water and wastewater facilities from cyberattack

“If you aren’t scared yet, you haven’t been paying attention.”  So goes the aphorism for modern times, and it applies equally well to industrial cybersecurity.  Conclusive proof is hard to come by, but consider the supporting evidence: U.S. presidential executive orders, vulnerabilities markets for ICS, U.S. Secretary of Defense warnings of a “cyber Pearl Harbor”, […]

Print Friendly
Continue Reading · 0
Penetrating Firewall

13 Ways Through A Firewall: What You Don’t Know Can Hurt You

Firewalls are seen as pillars of both business-focused and industrial, control-system-focused cybersecurity programs. But how secure are firewalls really? Firewalls have been with us for 25 years. While firewall limitations are well known to both black-hat and white-hat experts, those limitations are not as well known to everyday security practitioners. This article catalogs 13 classes […]

Print Friendly
Continue Reading · 0
101 Tips for a Successful Automation Career

Tip #3: Pain Is Instructive

I must confess that this is one of my favorite lines because it applies to practically everything from managing your boss, to dealing with co-workers, to raising children. The concept is simple—humans (and most animals) learn to avoid “pain.” (The word “pain” is used here in a very broad sense.) If we burn our fingers, […]

Print Friendly
Continue Reading · 0
Fig. 1. Schematic of test system ~HP5high pressure, LP5low pressure!

Modeling supply and return line dynamics for an electrohydraulic actuation system

Abstract: This paper presents a model of an electrohydraulic fatigue testing system that emphasizes components upstream of the servovalve and actuator. Experiments showed that there are significant supply and return pressure fluctuations at the respective ports of the servovalve. The model presented allows prediction of these fluctuations in the time domain in a modular manner. […]

Print Friendly
Continue Reading · 0