In a Pumps&Systems article, Digitalization to Predict Reliability of Mechanical Valves, Emerson’s Riyaz Ali shares ways continuous monitoring technology can help.
Digitalization for Improved Valve Reliability
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Riyaz has extensive experience with Digital Valve Controllers with Emerson's Fisher brand of valves. These microprocessor-based DVCs are used for field devices mounted on Final Control Elements for Basic Process Control System and Final Element on Safety Instrumented Systems.
Posts by or with Riyaz Ali
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...
Approaches to Partial Stroke Testing Safety Valves
The safety valve within a safety instrumented function (SIF) must be tested regularly to help assure proper operation in the event of a safety demand. Operators usually perform an offline full stroke test during a scheduled shutdown because of the impact of this test...
Simplifying Safety Valve Proof Testing
A safety instrumented function (SIF) within a safety instrumented system (SIS) consists of a sensor, logic solver, and final element. As part of the IEC 61511 global safety standard, these elements within the SIF must be tested during the operational phase of the...
Partial Stroke Test for Final Elements—Diagnostic Coverage Factors
Partial stroke test is one of the viable means to check mechanical integrity of Final Element of Safety Instrumented Function (SIF) loop. Generally, end users struggle on question of credit of PST for improvement in SIL (Safety Integrity Level). IEC 61508 and IEC...
Low-Bleed or Standard Relays for Control Valves?
Happy New Year everyone! I hope your holidays helped to recharge your batteries and get you off to a great start for 2018. I saw this exchange in my email over the holidays about the effects of using low-bleed relays with Fisher DVC6200 digital valve controllers for...
Selection Criteria in Compressor Anti-Surge Valves
Some of the most consistently popular posts here on the blog involve compressor anti-surge control. It's a condition in centrifugal and axial compressors where a flow reversal condition can occur. Wikipedia defines centrifugal compressor surge as: …the point at which...
Positioner Pneumatic Pressure Bleed in Throttling Control Valves
With the emphasis on improving energy efficiency and reducing greenhouse gas emissions, process manufacturers have turned to pneumatic low-bleed and zero-bleed valve positioners. Emerson's Riyaz Ali copied me on an email about a recent article that mentioned a...
5 Questions for Digital Valve Controller and Safety Expert Riyaz Ali
Let's continue our 5 Questions for an Emerson Expert podcast series with our guest, Riyaz Ali. You may recall Riyaz from numerous posts about digital valve controllers and final control elements in safety instrumented system applications. He has almost 40 years'...
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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.