I had the chance to catch up with Emerson's Riyaz Ali at the Emerson Exchange last month in Nashville. You may recall Riyaz from many process safety-related posts. In his conversations with process automation and safety professionals, he has been encountering some...
I saw an email string with a question asking if it's possible to detect all possible failure modes in a safety valve if very intensive and intrusive tests, such as full-stroke testing, leak testing, etc. are performed. Would it be conceivable to use 100% proof test...
Over at the Read-Out Instrumentation Signpost blog, Eoin Ó Riain shares the news of a new social hub for automation professionals—the International Society of Automation (ISA)'s ISA Interchange. I had the opportunity to share my views and ideas with the team that...
Update and bump: I received great news from Riyaz that the ISA Kuwait section has agreed to let us upload and link to their December 2009 newsletter containing Riyaz's article, When is a Safety Integrity Level (SIL) Rating of a Valve Required? I'd like to thank the...
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...
Safety instrumented functions (SIFs), also known as safety loops, are comprised of a sensor to sense the process condition, a logic solver to decide the safety action to take, and a final element to perform the action. Emerson's Riyaz Ali and I & C Specialist's C...
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...
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...
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...
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...
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...
I'm lucky enough to receive a copy of Andrew Bond's Industrial Automation Insider newsletter each month through an Emerson subscription agreement. Andrew covers the happenings among the automation suppliers and standards bodies. You can also find some of Andrew's...
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