Diagnostics
How Vibration Analysis Saved One Plant Tens of Thousands of Dollars
TFG's vibration analysis team caught bearing wear on a Joy centrifugal compressor before any shaft damage occurred. Here is what the data looked like and why it mattered.
Our vibration analysis team recently reviewed a Joy centrifugal compressor at a customer site. The findings pointed clearly to bearing wear. Once the machine was opened, the team was spot on, and the timing could not have been better.
The failure was caught before any major shaft damage occurred. That distinction matters. Bearing replacement is a manageable repair. Shaft damage turns a scheduled rebuild into an emergency, and an emergency into a significantly larger bill. In this case, catching it early saved the customer tens of thousands of dollars.
What the data showed
The vibration spectrum told the story before anyone opened the machine. The analysis showed:
- A spike at the running speed of the low-speed pinion
- A second spike at 20x the running speed of the low-speed pinion
- A raised noise floor at the base of the 20x spike
These are classic indicators of bearing wear. The spike at running speed is expected. Every rotating machine produces it. What you are watching for is the harmonic structure above it and what the noise floor is doing around those harmonics. When you see a raised floor at the base of a 20x spike, you are looking at wear, not just vibration.
The recommendation from the analysis: run normally, but open the machine for physical inspection soon. The customer acted on it. Good call.
Why this kind of work matters
Vibration analysis is not about generating reports. It is about giving plant engineers and maintenance teams actionable information before a problem becomes a crisis.
The Joy compressor in this case was old but functional. It had no obvious symptoms that would have triggered an emergency call: no audible changes, no pressure drops, no trips. The data found what the ear could not.
We will get this old Joy rebuilt and back in service. Done right, it should run reliably for decades more.
If you have not had a vibration survey done recently
Compressed air systems that run continuously, and most centrifugal compressors do, accumulate wear in ways that are not always visible until something fails. A structured vibration analysis gives you a baseline, catches developing problems early, and supports smarter maintenance planning.
Reach out to The Fischer Group to schedule a site assessment. The cost of the analysis is a fraction of the cost of catching a failure late.
Learn more about testing and diagnostics and preventative maintenance programs, or contact The Fischer Group to schedule a vibration survey.