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Sharing Devices between Control and Safety Instrumented Systems
Jim Cahill
Emerson’s Mike Boudreaux alerted me to a discussion in the Oil and Gas Instrumentation Club LinkedIn group. The thread referenced an earlier post on this blog, Field Device Sharing Between Control and Safety Systems that Mike had written. Mike quoted...
1 May 2012
Additional Clarifications on Digital Valve Controllers in Safety Applications
Jim Cahill
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...
1 Mar 2012
Centralized, Distributed, and Hybrid Safety Instrumented Systems
Jim Cahill
Emerson’s Mike Boudreaux alerted me to a great article comparing safety instrumented system architectures. The ISA InTech article, Centralized or distributed process safety compares and contrasts centralized, distributed, and hybrid safety systems. Centralized...
11 Jan 2012
Clarifications on the Use of the DVC6000 SIS in Safety Applications
Jim Cahill
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...
1 Dec 2011
Safety Valve and Actuator Proof Test Coverage
Jim Cahill
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...
9 Nov 2011
2011 Emerson Exchange – Addressing Partial Stroke Testing Fears – Avoiding False Trips, Risk Through…
Jim Cahill
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...
25 Oct 2011
Clear and Concise Safety Requirements Specifications
Jim Cahill
Update and bump: Here is the link to Andy’s paper, The importance of a clear Safety Requirements Specification as part of the overall Safety Lifecycle, which is now posted. Original May 2011 post: Emerson’s Andy Crosland, a process safety expert, will...
15 Sep 2011
Safety Instrumented System Architecture Diagnostics
Jim Cahill
The language of process safety is filled with its own jargon. Architectures are described as 1oo1, 1oo2, 2oo2, 2oo3, etc. The “oo” means “out of”. So, 1oo1 means one-out-of-one. William M. Goble and Harry Cheddie wrote a book, Safety Instrumented Systems...
13 Sep 2011
Roundup of Process Safety Thoughts and Ideas
Jim Cahill
As we did with the recent energy efficiency post, I wanted to highlight a few key points made in past IEC 61511 safety lifecycle-related posts. This global safety standard provides a performance-based methodology to plan and execute your process safety...
7 Jul 2011
Adopting the IEC 61511 Safety Lifecycle Standard
Jim Cahill
I saw a great article from exida‘s Dr. Peter Clarke, Setting the Standard, on how process plants can benefit through proper and careful adoption of the IEC 61511 global safety standard. It’s perhaps the best primer I’ve seen in a while on the safety lifecycle...
28 Jun 2011
Confusing Personal and Process Safety?
Jim Cahill
Over at the Process Safety Management (1000+) LinkedIn group is a provocative question, Personal Safety & Process Safety – does management really confuse the two? Do engineers confuse them? The thread began a month ago and has 77 responses and 4 “likes...
26 May 2011
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