Vibration Analysis for compressors
Vibration Analysis is one of the most effective ways to monitor compressors: it catches developing faults — valve wear and breakage (reciprocating), bearing wear, rotor fouling and clearance loss — early, so repairs are planned rather than forced by a breakdown.
Why vibration analysis suits compressors
Compressed air and process gas are expensive to produce and critical to operations, so a compressor failure is doubly costly: lost production plus a high-value repair. Compressors also degrade gradually — fouling and valve wear quietly raise energy use long before failure — so monitoring protects both uptime and the energy bill.
How vibration analysis works
Accelerometers capture the vibration signal, which is transformed (typically via FFT) into a frequency spectrum. Because each fault type excites characteristic frequencies — running speed for imbalance, twice running speed for misalignment, bearing-defect frequencies for bearing wear — the spectrum reveals not just that something is wrong but what and how severe. Trending the signal against a baseline turns a vague 'it sounds rough' into a dated, prioritised work order.
Faults it catches on compressors
- Valve wear and breakage (reciprocating)
- Bearing wear
- Rotor fouling and clearance loss
- Lubrication problems and oil contamination
- Overheating and efficiency degradation
- Imbalance and misalignment
What the data shows
Rising amplitude at running speed points to imbalance; high vibration at twice running speed suggests misalignment; energy at specific bearing-defect frequencies indicates bearing wear; broadband high-frequency noise can mean lubrication problems or, on pumps, cavitation.
Vibration Analysis on compressors: implementation
What the signal looks like. Rising amplitude at running speed points to imbalance; high vibration at twice running speed suggests misalignment; energy at specific bearing-defect frequencies indicates bearing wear; broadband high-frequency noise can mean lubrication problems or, on pumps, cavitation.
How that reads on compressors specifically. Rising discharge temperature or falling efficiency at constant load signals fouling or valve wear; vibration and oil-debris trends reveal bearing condition. Combined, they separate 'clean it', 'change valves' and 'plan an overhaul'.
Where it is blind. Vibration Analysis does not cover every failure mode on compressors. The equipment profile also lists Oil analysis for wear metals and contamination, Temperature and pressure (process) monitoring for efficiency drift, Ultrasound for valve and leak detection on reciprocating units — they exist because they detect modes this technique cannot see.
Before you set a threshold. Baselining, alarm criteria and the route from alert to work order are the same problem for every technique. They are covered once in setting up a condition monitoring programme and in the vibration analysis overview.
Vibration Analysis on other equipment
Vibration Analysis for pumps · Vibration Analysis for electric motors · Vibration Analysis for fans and blowers · Vibration Analysis for bearings
Other techniques on compressors
Oil Analysis for compressors · Ultrasound Testing for compressors
Related
Predictive maintenance for compressors · Vibration Analysis overview · Vibration Analysis