At the Emerson Exchange Americas virtual series, Emerson’s Mike Hoyme and Stanley Af demonstrated diagnostics in the final elements within a safety instrumented function.
Diagnostics for Final Elements in Safety Applications
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partial stroke test
Understanding Functional Safety Concepts and Final Element Suitability
The world of functional safety has its own tribal language and acronyms, e.g. safety instrumented systems (SISs), safety instrumented functions (SIFs), logic solvers, final elements (FEs), safety integrity level (SIL), probability of failure on demand (PFD), etc. In a...
When is a Safety Integrity Level Rating of a Valve Required?
Control valves play a large role in process control. Emerson's Riyaz Ali shared with me that he is often asked about their use in safety instrumented functions (also known as safety loops). When asked recently, he shared an ISA Safety Division newsletter from the fall...
Additional Clarifications on Digital Valve Controllers in Safety Applications
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...
Safety Valve and Actuator Proof Test Coverage
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...
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...
Hydraulic Partial Stroke and Diagnostics on Emergency Shutdown Valves
I've discussed partial stroke testing (PST) as a diagnostic for the health of a valve in many posts over the years. These posts describe flow applications found in most process manufacturing facilities. But what about high-pressure and hydraulic applications including...
Credit for Partial Stroke Tests in Verification Process
A question was posed this week to Emerson's Mike Boudreaux about how to take credit for partial stoke tests in a performance verification process. Mike leads the process safety systems efforts and was presenting on this topic this week. He wrote up this post to recap...
Testing the Safety Valve in a Safety Instrumented Function
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...
DeltaV SIS Roadmap Recap from Emerson Exchange
The product and service roadmap sessions are typically the most highly attended sessions at Emerson Exchange. Attendees are anxious to understand the forward paths for these products and services. You might have already read about this year's DeltaV SIS roadmap...
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...
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The opinions expressed here are the personal opinions of the authors. Content published here is not read or approved by Emerson before it is posted and does not necessarily represent the views and opinions of Emerson.