How vibration analysis is transforming compressor maintenance

TODAY’S CONDITION monitoring now relies on sophisticated instruments that provide a level of precision impossible to achieve by touch or hearing. Thermography can reveal hot spots invisible to the naked eye, ultrasonic detectors expose leaks that the ear cannot catch, and oil analysis highlights hidden contamination. 

Vibration analysis complements these methods by going deeper into a machine’s mechanical health. It is especially powerful for air compressors because it reveals the early signs of bearing wear, imbalance or misalignment that can undermine both reliability and efficiency. If compressed air is the lifeblood of production, vibration analysis is the stethoscope that listens to its heartbeat.

Why vibration matters

Air compressor failure can halt output, threaten delivery schedules and inflate costs. Routine servicing dictated by time or running hours has long been the safety net, but vibration analysis provides something more powerful. It is an early warning system that helps operators anticipate mechanical wear before it becomes critical or conversely shows when the equipment is running well.

How it works in practice

At its core, vibration analysis involves placing a sensor on key points of a compressor and measuring how the machine vibrates under different load conditions. The data is interpreted using software that compares results against expected values. Even small deviations can reveal early-stage problems that would otherwise remain hidden.

For smaller machines, a series of readings can be captured in less than half an hour. For larger 200-kilowatt units with multiple measurement points, the full procedure, analysis and reporting may take closer to two hours. The compressor remains in operation throughout, meaning there is no disruption to production.

The results are typically presented using a simple traffic light system. Green indicates normal operation, orange highlights issues that should be revisited within a few months, and red signals the need for immediate action. This clear framework helps maintenance teams make informed decisions about priorities and investment.

Real world impact

A major UK food production site provides a useful illustration. The facility operates more than a dozen compressors supplying air to fermentation tanks. With several machines approaching their overhaul point, the potential cost and disruption were significant.

Vibration analysis was used to build trend profiles across the fleet, identifying the compressors that were in good condition, which ones were deteriorating slowly and which required urgent intervention. Armed with this insight the site was able to prioritise remedial work, and avoiding the risk of multiple failures hitting simultaneously. The service plan was reshaped around actual operating data rather than fixed intervals. Every site and application is different, and although some customers prefer the traditional running hours based overhauls, this isn’t the same for everyone.

This was the case for a food packaging facility in the north of England, where a variable speed compressor had reached its manufacturer’s recommended overhaul point and, under normal practice would have been stripped down and rebuilt. Yet the vibration data told a different story. Because the compressor seldom ran at maximum load its components had experienced far less wear than predicted. The overhaul was unnecessary.

Instead, the company invested in upgrading their older fixed speed backup compressors to improve overall system efficiency. Vibration analysis prevented unnecessary maintenance spend and supported a long-term investment decision that improved both reliability and energy performance.

A bridge to predictive maintenance

Over time, the real prize is prediction. As data accumulates across fleets, industries and operating conditions, vibration analysis becomes more than a diagnostic tool. It feeds into predictive models that show not only the current state of a machine but how that state is likely to evolve. This makes it possible to plan interventions months in advance, align maintenance with production schedules and order parts before they are needed.

By bridging today’s condition monitoring with tomorrow’s predictive maintenance, vibration analysis provides a pathway to a more reliable and cost-efficient compressed air system.

What a vibration analysis report shows

While vibration analysis is often described in broad terms, the practical value comes through the structured reporting provided to maintenance teams. A vibration analysis, for instance, captures measurements from multiple points across the compressor – such as bearings, gearboxes, and motor drive ends – under real operating conditions. Each measurement is benchmarked against expected baselines to detect anomalies that signal early wear or developing faults.

The reports distil complex vibration signatures into clear findings. Results are categorised by severity, with “no action,” “monitor,” or “urgent action” recommendations. For example, a gearbox bearing showing progressed-stage defects would be flagged as requiring immediate attention, while other points might show no evidence of wear. This traffic light-style framework helps teams prioritise interventions and prevents issues being buried in technical jargon.

Atlas Copco has recently introduced a vibration analysis service for compressors that builds on these principles. The approach provides rapid on-site diagnostics without interrupting production, helping customers detect bearing wear, imbalance or misalignment before they escalate. Reports are delivered with clear recommendations, giving maintenance teams the evidence they need to plan ahead.

By embedding vibration analysis into broader service support, Atlas Copco helps manufacturers reduce total cost of ownership, improve equipment reliability and protect workplace safety. The service is already being applied in sectors as varied as food and drink, pharmaceuticals, oil and gas and general manufacturing.

Ben John is business line manager for compressor technique service at Atlas Copco Compressors UK

For more information:

www.atlascopco.com/en-uk

Tel: 0800181085