Riyaz Ali

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.

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Posts by or with Riyaz Ali

Approaches to Partial Stroke Testing Safety Valves

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...

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Simplifying Safety Valve Proof Testing

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...

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Low-Bleed or Standard Relays for Control Valves?

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...

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Selection Criteria in Compressor Anti-Surge Valves

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...

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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.