Analysis of Causes for Excessive Vibration and Abnormal Noise of Pumps

Causes and Solutions for Excessive Vibration and Abnormal Noise of Pumps

Causes & Corresponding Solutions

1. Misalignment between motor shaft and pump shaft

Correct the coaxiality of the motor shaft and pump shaft

2. Corroded or worn impeller and unbalanced rotor

Replace the impeller and conduct precision balance test

3. Friction between impeller and pump casing

Inspect and adjust components to eliminate friction

4. Bent pump shaft

Straighten the pump shaft

5. Loose foundation bolts

Tighten the foundation bolts

6. Cavitation inside the pump

Adjust the outlet valve to keep the pump operating within specified performance range

Note: Real-time monitoring of pump operating conditions is required to guarantee its safe operation. Abnormal vibration and noise are the primary fault characteristics of rotary pump machinery, and their vibration signals reflect equipment fault information in amplitude domain, frequency domain and time domain. Therefore, vibration measuring devices must be deployed to conduct real-time monitoring on pumps and matching motors.

Our company’s integrated vibration transmitter model SK-B-5 or piezoelectric integrated vibration sensor PAS1120 can be adopted for such monitoring.