A few months ago, I attempted to clear up some misconceptions about the use of digital valve controllers in safety applications in a post, Clarifications on the Use of the DVC6000 SIS in Safety Applications. It addressed misconceptions about references to the obsolete...
digital valve positioner
2011 Emerson Exchange – Addressing Partial Stroke Testing Fears – Avoiding False Trips, Risk Through…
Exida's Dr. William Goble and Emerson's Afton Coleman presented Addressing Partial Stroke Testing Fears - Avoiding False Trips / Risk Through... Their abstract: It is not uncommon for some users to perform partial stroke testing (PST) using cumbersome mechanical or...
Impacts of Control Valve Diagnostics
Plants tend to run longer in between turnarounds, or the period of time in which a plant is shut down for maintenance. These turnaround time intervals can be three, four, five, or even longer depending on the process and the industry. Emerson's Riyaz Ali, whom you may...
Failure Modes of Positioners in Safety Applications
A few weeks ago, I highlighted a thread from the ISA Safety email list on partial stroke testing using control valve positioners. A few weeks later, this thread is still going strong. Emerson's Riyaz Ali sent me some of the recent exchanges. A concern was expressed...
Addressing Safety Valve Opening Times with Partial Stroke Tests
A question came into the ISA's Safety email list concerning the use of valve positioners in partial stroke tests for valves used in safety shutdown applications. The person asking the question wrote: I was informed that PST using positioner such as the Fisher/Emerson...
Adding Wireless Valve Position Monitoring
Update: Unfortunately the video had to be removed. I'll add another update to the post when the existing, revised, or new video becomes available. I apologize for the inconvenience. Emerson Process Management's Fisher Valve team has opened up a channel, Fisher Control...
Diagnosing Valve Performance Issues
My good friend Riyaz Ali, whom you may recall from earlier process safety and digital valve controller-related posts, was kind enough to send me an article he's recently written. The subject is performance diagnostics for control valves. Since control valves are in...
Extending Plant Turnarounds Out 5-7 Years
Industrial Automation Insider's Andrew Bond wrote an article for ControlGlobal.com, DVCs Drive Digitization of the Process Industries. It describes the introduction of digital valve controllers by Emerson's Fisher business in the 1990s and their widespread use--more...
Do You Know Your Manual Valve’s Position?
I don't want to admit how long I've know Emerson's Kurtis Jensen, but it does goes back to the pre-Emerson days at Fisher Controls. Kurtis is an instrument product manager for the Fisher Valve and Valve Automation businesses. He's penned a great article for Valve...
Greg McMillan and Friends Measurement and Final Element Book
Being lousy at secrets, I thought I'd share some news in an email from ModelingAndControl.com's Greg McMillan. He's just completed a book, Essentials of Modern Measurements and Final Elements for the Process Industry: A Guide to Design, Configuration, Installation,...
Look Beyond Control System when Modernizing
The EngineerLive website has an article, System migration: make sure you improve control, not just replicate, which shares many of the thoughts we've expressed in recent modernization posts. I turned once again to Emerson principal modernization consultant, John...
Positioners and Partial Stroke Tests in Safety Applications
InTech magazine has a web exclusive on the importance of safety valves in a safety instrumented system. The article, Valve failure: Not an Option, describes methods of implementing partial stroke testing (PST) to reduce the probability of failure upon demand, average...
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