You are hearing noise

  • The product is cavitating in the pump. There are four types of cavitation:
    • Vaporization.
    • Internal recirculation
    • The Vane Passing Syndrome
    • Turbulence
    • And one that resembles cavitation, Air ingestion
  • A rotating component is rubbing.
  • The bearings are bad.
  • The seal has come loose from the shaft. The soft stainless steel set screws have vibrated loose from a hardened shaft or sleeve.
  • A foreign object has entered into the stuffing box or was left in the stuffing box during the last seal change.
  • The sleeve is hitting an API (American Petroleum Institute) disaster bushing.
  • The seal faces are running dry. They will make a whistling noise.
  • You have hit a critical speed.
  • Coupling misalignment.
  • The noise is coming from the motor or some near by equipment.
  • “Slip stick” at the seal faces.


  • On February 18, 2018