Cavitation:

Flow Recirculation versus Inadequate NPSHA



Q  -  Can you differentiate the symptoms of cavitation caused by internal flow
recirculation from that caused by inadequate NPSHA?


A  -  The following are some typical symptoms of cavitation caused by internal flow
recirculation:

  • cavitation damage in the high pressure side of impeller vanes

  • random crackling noise at pump suction side

  • noise is reduced at higher flow rate

  • vibration is at (or less than) 1x RPM, at vane pass frequency, or at odd
    frequencies


The following are some typical symptoms of cavitation caused by inadequate
NPSHA:

  • cavitation damage in the low pressure side of impeller vanes

  • steady crackling noise at pump suction side

  • noise is reduced at lower flow rate

  • vibration is at odd frequencies
CENTRIFUGAL-PUMP.ORG
Related topics

Introduction to cavitation
Impeller erosion
Noise and damage
Recirculation vs. insufficient NPSHA
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