Centrifugal pump minimum flow recirculation
reducing cavitation
Cavitation occurs on liquid applications when drops in pressure cause vapour bubbles (cavities) to form within the liquid. As these bubbles collapse, shock waves are created which can impact on the metallic surface of the valve or trim. Though the shock waves may be small, cavitation can result in brand new equipment being out of service within minutes, in extreme cases.
Correct specification is vital to avoiding severe damage from cavitation. To bring cavitation under control it is usually necessary to stage pressure drops gradually, using specially-designed multi-stage trims. Often, where problems still arise it is because the pressure drop has not been staged sufficiently and is too sudden causing vapour bubbles to form.
Case study
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