Abnormal pump noise does not always indicate a failed component.

Recently, our engineering team was called to investigate an unusual operating noise reported by a customer. The first suspicion was mechanical seal failure, as this is a common assumption when abnormal noises occur.

However, after an on-site inspection, no visible seal damage or leakage was found.

By reviewing the operating conditions and process parameters, we identified the actual cause as cavitation.

What Is Cavitation?

Cavitation occurs when the pressure at the pump inlet drops below the liquid's vapor pressure, causing vapor bubbles to form inside the pump.

As these bubbles move into higher-pressure areas, they collapse rapidly, producing characteristic noise, vibration, and localized impact forces.

If cavitation continues for an extended period, it may lead to:

• -Increased vibration
• -Reduced pump performance
• -Premature wear of internal components
• -Shortened equipment service life

How Can Cavitation Be Prevented?

Although every application is different, the following practices can significantly reduce the risk of cavitation:

• -Ensure sufficient NPSH Available (NPSHa).
• -Minimize restrictions in the suction piping.
• -Keep suction piping as short and straight as possible.
• -Avoid operating the pump beyond its recommended speed.
• -Consider the liquid temperature, viscosity, and overall process conditions during pump selection.

-Proper system design is just as important as selecting the right pump.

Engineering Is About Finding the Root Cause

When unusual noise occurs, replacing components should not always be the first response.

Understanding the operating conditions and identifying the actual cause often results in a faster, more effective, and more economical solution.

This field case serves as a reminder that many pump issues originate from system conditions rather than component failure.

About TAYEE Pump

TAYEE Pump specializes in hygienic rotary lobe pumps for the food, beverage, pharmaceutical, and personal care industries. In addition to supplying pumps, we work closely with equipment builders and end users to analyze application challenges and recommend practical pumping solutions based on real operating conditions.