Valves used in process safety applications remain static for much of their existence in a manufacturing or production process. Digital valve controllers can play an essential role in ensuring these valves operate as they should when called upon in an abnormal situation.
Riyaz Ali provides clarity on when to assign the SIL suitability for valves used in different scenarios (process control vs. safety shutdown) and establish criteria to assign SIL applicability for the “Final Element”.
LNG facilities and pipelines rely on valve positioners to provide precise and reliable flow control. My article in the January 2025 issue of LNG Industry on pages 35-38, titled “Wise Valve Selection Improves Performance,” discusses key features of modern...
Emerson’s Riyaz Ali & Tom Mullins join podcast host Jim Cahill to share the story of an LNG producer and how they applied digitalization in their project design and installation to deliver integrated solutions to improve the project schedule and ongoing operational performance.
Generally, depending upon the design of internal components of smart devices and their response to control change from the controller input signal, pneumatic parts like I/P (current-to-pressure transducer) and pneumatic relays are tailored to optimize control performance.
Emerson’s Riyaz Ali presented Digital Valve Controller Used with Final Control Elements Inching Towards Net Zero Emission at the 2024 Emerson Exchange conference in Düsseldorf, Germany. Here is his presentation abstract: Energy consumption is a big part of process...
Digital transformation of field instrumentation can spark one’s imagination with new concepts, including the possibility of data harvesting from automated on-off valves. Automated on-off valves are typically used in a basic process control system (BPCS) or safety instrumented system (SIS). In these and other automation systems, they must function properly to optimize performance, availability, and reliability. The data provided by smart on-off valves can be used to increase uptime, reduce maintenance costs, and improve safety.
I’ve often written about how digital valve controllers improve control valve performance and ongoing maintenance. But how about on-off valves? In this Valve World Americas featured story, How Digitized On-Off Valves Improve Operations, Emerson’s Riyaz Ali explains how...
For air-operated control valves, the pneumatic power at a constant supply pressure is proportional to the mass flow rate of instrument air. The pneumatic/eletro-pneumatic/microprocessor-based digital valve controller is used on most control valves operated in closed-loop control, where the input signal is continuously changing.
Riyaz Ali discussed with a major international oil company ways to eliminate supply line relief valves or needs for higher pressure-rated actuators should the air filter regulator (AFR) fail.
I received a question from an earlier post, End of Life Expectancy for Final Control Elements in Safety and Control Systems, by Emerson’s Riyaz Ali. The instrument & control engineer who came upon the blog post wrote…
When is it possible to use control valves like final elements for SIS [safety instrumented system] application? I am looking for other useful documents and technical requirements when it is possible to use only control valves as the final element instead of on/off valves and not in combination with it in the SIF [safety instrumented function] application.
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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.