Preventing Cavitation in Liquid Applications

by | May 21, 2014 | Valves, Actuators & Regulators

Jim Cahill

Chief Blogger, Editor

In the Fisher Valve & Instruments YouTube series on reducing cavitation in your process flows, the 3-minute second video, Cavitation Mitigation Part 2 shows a split line demonstration of cavitation. I highlighted Part 1 in yesterday’s post, Reducing Cavitation in Piping.

Emerson’s Melissa Niesen, shows the difference in flow patterns across a thick plate in the line with a single, through hole versus a second plate in the other line with an array of holes, like those found in Cavitrol III valve trim. The cross-sectional exit areas of the holes in the plates on both lines is the same.

You’ll notice how much louder and lower the noise frequency is flowing through the single-hole plate from the cavitation formed by the pressure drop. In addition to the potential damage this causes in the piping, the line with the multi-hole plate also had higher throughput than the line with the single-hole plate.

Each plate hole creates a small flow stream with a vena contracta pressure higher than that typically present in the flow stream of the line with the single-hole plate.

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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.