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...
digital valve controller
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...
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...
Advanced Valve Diagnostics in a Maintenance Tech’s Hands
Handheld field communicators have been the tool of maintenance technicians to configure and calibrate their smart field devices since the 1980s. With technology advancements and by taking a fresh look at handheld usability with a lens on the problems maintenance techs...
Wireless versus Fieldbus Cost Comparison
At last week's Emerson Exchange, John Rezabek of ISP presented Wireless or Fieldbus? You might recall John from his columns in Control magazine and on the ControlGlobal.com site. He presented a cost comparison for a plant expansion considering Foundation fieldbus...
Final Control Element Partial Stroke Testing
Emerson's Riyaz Ali, whom you may recall from earlier posts, wrote an Inside Functional Safety article recently titled, Digital Technology: A remedy for sick shutdown valves in Safety Instrumented System (SIS) applications. The paper is available for purchase from...
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...
Getting Your Power Plant Unstuck
Imagine that your power plant is about to have a scheduled outage. As the unit is ramped down and feed water control is taken over by the by-pass valves, you discover that the control valves refuse to close upon receiving orders from the level control system to do so....
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