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Is it worth to change the casing of the pump than to change it completely if it has been seriously affected by cavitation?

April 26, 2017affected casing cavitation completely pump worth

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Is it worth to change the casing of the pump than to change it completely if it has been seriously affected by cavitation?

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The right approach is to do Root Cause Failure Analysis (RCFA). If it is established that the damage is due to cavitation, the reasons for cavitation have to be investigated. Replacing the casing or impeller or even the pump casing may not eliminate cavitation. New casing or new impeller or new pump may again suffer cavitation. In a cooling water system, 2-pole pumps were suffering from cavitation. However,4-pole pumps for the same duty did not have the problem. NPSHr of 2-pole pumps was very high, whereas that of 4-pole pumps was low. In another system, changing plug valves by ball valves reduced friction loss on the suction side and cavitation got eliminated.