How integrating physical inspection and digital monitoring can reduce air leak issues

These figures help illustrate the potential scale of the issue, but they remain broad benchmarks and do not reflect what is happening within any specific system.

In recent years, higher electricity costs have led many manufacturers to examine their compressed air systems more closely. In doing so, some have found that overall air demand no longer aligns with production activity, prompting questions about what is happening within the distribution network itself. Leakage, once ignored and absorbed into day-to-day operation, has become harder to overlook.

Why leaks pervade

One reason air leakage persists is its lack of visibility. Unlike water or oil, escaping compressed air rarely creates a visible hazard. Smaller leaks are often inaudible in busy factory environments and may be located above ceilings, behind machinery or deep within pipework runs.

Maintenance teams, already operating under pressure, tend to prioritise faults that directly interrupt production. Minor pressure losses or incremental increases in compressor demand are easy to miss, particularly when they develop slowly. Over time, these small losses accumulate, increasing energy use and placing additional demand on equipment.

As a result, a significant proportion of compressed air generated on site may never reach the point of use. Instead, it is lost through degraded seals, ageing connections or poorly maintained infrastructure, forcing compressors to work harder than necessary to maintain system pressure.

The limits of periodic inspection

Ultrasonic leak detection surveys remain an established and effective way to identify and locate leaks. When carried out regularly and followed by remedial action, they can deliver meaningful reductions in wasted energy.

The challenge lies in continuity. A single audit, even a thorough one, represents only a snapshot in time. Compressed air systems are dynamic. New leaks can develop as equipment is moved, pipework is altered or components wear. Between inspections, leakage can increase without triggering immediate concern.

For sites operating continuously, or with limited access windows, this can create a growing gap between inspection cycles and actual system performance. By the time the next survey is carried out, losses may already be significant.

Reading system behaviour

To address this gap, some manufacturers are beginning to pay closer attention to how their compressed air systems behave over time, rather than relying solely on periodic physical checks.

Changes in compressor operation can provide early indications that leakage is increasing. Unexpected rises in run hours, particularly outside normal production periods, often suggest that air is being generated without a corresponding demand. In some cases, standby compressors are drawn into regular operation even though output levels remain unchanged.

Remote monitoring platforms make it possible to identify these patterns without conducting a physical inspection. By analysing compressor performance data, it becomes easier to see when air demand no longer matches production activity. While this does not identify the physical location of a leak, it provides a clear signal that the system is no longer operating as expected.

This action shifts leak detection from confirmation to indication. Instead of waiting for a scheduled audit or responding to escalating energy bills, maintenance teams can use system behaviour to decide when further investigation is warranted.

In practice, this allows engineering resources to be deployed more efficiently. It also strengthens the business case for action. When leakage is expressed in operational and cost terms, especially as a monetary value, it becomes easier to justify repairs and plan remedial work.

Extending visibility beyond generation

Recent developments in sensor-based monitoring are extending visibility beyond the compressor room and into the compressed air pipework itself. Rather than focusing solely on air generation, sensors can now be installed at multiple points along the distribution network, capturing pressure, flow and air quality data within the pipework that delivers air across the site.

By comparing conditions between different sections of pipework, engineers can identify where pressure drops or flow changes occur. If performance differs between two points, it indicates an issue somewhere in between. That issue may be leakage, inappropriate usage or a developing fault within the distribution system.

This approach turns the pipework from a passive asset into a transparent, real-time  compressed air ecosystem. Instead of relying on periodic inspections alone, teams gain ongoing insight into how air is behaving as it moves through the network. Alerts can be triggered when predefined thresholds are breached, allowing potential problems to be investigated before they escalate into operational disruption.

Supporting established practice

This sensor-based monitoring approach is not positioned as an alternative to established physical leak detection methods. Ultrasonic surveys remain essential for pinpointing exact locations and quantifying individual leaks.

What continuous insight provides is context. It informs when surveys are most needed and where they are likely to deliver the greatest benefit. In doing so, it supports a more structured and sustainable approach to managing leakage over time.

Manufacturers that combine remote monitoring with regular physical inspection are beginning to treat compressed air as a managed utility. Over time, this can help stabilise energy use, reduce unnecessary compressor loading and extend equipment life.

Towards a more proactive model

The wider implication is a shift in maintenance approach. As engineering teams are required to manage increasingly complex systems with limited resource, the ability to anticipate issues becomes more important than reacting to them.

Compressed air leaks may never be eliminated entirely, but they no longer need to persist unchecked. With greater visibility into system behaviour, manufacturers can intervene earlier, make more informed decisions and avoid the gradual drift into inefficiency that characterises many compressed air networks.

If periodic leak surveys have long been considered best practice, the question now is whether they are sufficient on their own. As remote insight becomes more widely adopted, continuous visibility may prove to be the missing link between knowing leaks exist and keeping them under control.

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