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Posts Tagged ‘cavitation’

Educational Video on Control Valve Cavitation

Posted in Final Control Element on Tuesday, March 28th, 2017. No comments yet
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Wikipedia defines cavitation as: …the formation of vapour cavities in a liquid – i.e. small liquid-free zones (“bubbles” or “voids”) – that are the consequence of forces acting upon the liquid. It usually occurs when a liquid is subjected to rapid changes of pressure that cause the formation of cavities where the pressure is relatively […]

Mitigating Cavitation and Outgassing Control Valve Damage

Posted in Emerson Exchange, Final Control Element on Tuesday, October 25th, 2016. No comments yet
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At the Emerson Exchange conference in Austin, Emerson’s Jonathan Vance presented Outgassing and Cavitation: Not So Good Vibrations. Here’s the abstract: Outgassing and cavitation are two of the most common issues associated with control valves. Both phenomena often occur in high pressure drop applications and result in excessive vibration; however, the solutions to combat these […]

Regulators versus Control Valves: What’s the Best Fit?

Posted in Final Control Element on Thursday, October 9th, 2014. 4 comments so far
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Keith Erskine with Emerson local business partner Puffer-Sweiven and Vince Mezzano with Fluor co-presented a look at considerations in selecting control valves versus regulators. Their abstract: This session will review the selection criteria for consideration of pressure regulators vs. control valves for uses on various applications to ensure the best technical and cost-effective solutions. Understanding […]

Sources, Causes, and Ways to Decrease Process Noise Levels

Posted in Final Control Element, Technologies on Monday, January 21st, 2013. One comment so far
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Those that work or have visited industrial processes know how loud they can be with the fluids flowing through the process. Emerson’s Fisher Valves & Instruments team has a great piece, The Silent Treatment—Fisher Solutions to Noise Problems. It addresses common sources by industry, the science behind noise generation, factors impacting the intensity and frequency […]

Abating Acoustical Noise in Piping

Posted in Final Control Element, Plant Equipment on Tuesday, February 2nd, 2010. No comments yet
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Last week, I shared how resonance can contribute to excessive machine vibration in the post, Spotting and Fixing Resonance in Plant Equipment. A colleague pointed me toward another true Emerson Expert, Dr. Allen Fagerlund. Al’s expertise is on noise measurement and prediction. He also serves on the ISA75, Control Valve Standards and its subcommittee, ISA75.07, […]