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This issue is a rising trend and has become more common for several reasons. A thorough root cause analysis in addition to education regarding the matter will show air entrainment is a much more common pump ailment than initially believed.

Poor pump performance is often confused and erroneously blamed on a multitude of symptoms other than air entrainment. However, air entrainment even in amounts of 1 to 2 percent will cause pump performance to drop dramatically. Many users will inject up to 0.9 percent air to cushion the effects of cavitation. The bubbles may change in size but typically do not collapse when running through the pump.Īir entrainment in very small amounts can actually be a good thing. The difference is that cavitation is the formation and subsequent collapse of vapor bubbles, while air entrainment is simply air bubbles that were in the process stream before the pump and will remain there after the pump. In recent months, I have been involved in four cases of misunderstood pump performance where air entrainment was determined to be the main culprit.Īir entrainment may sound like and be confused with cavitation in an operating pump. I didn’t plan on writing about air entrainment again, but recent field issues pushed me to revisit the subject. Read Jim Elsey's 'Most Common Reasons for Air Entrainment in Pump Systems' here.

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