Compressed Air Piping System Maintenance: Leak Detection & Air Purification

Original | Quality-Driven CHANUN Air Compressors
December 15, 2025
Simple Maintenance for a More Reliable Power Source
In industrial production, compressed air is often compared to the “blood” of the factory, while the piping system functions as its “blood vessels.” Keeping this system unobstructed, leak-free, and clean directly affects production stability and energy costs.
According to statistics, air leakage in factories typically accounts for 10%–30% of total compressed air output, meaning a significant amount of electricity is wasted every year. Proper maintenance of the compressed air piping system is therefore essential.

01 Leak Detection: Finding the Root Cause Comes First
Compressed air leaks not only waste energy, but also cause pressure drops, reduce pneumatic equipment performance, and may even lead to unexpected production shutdowns.
Common leak points are mainly found at pipeline connections, including:
• Rubber hose fittings
• FRL units (filter-regulator-lubricator)
• Quick couplings
• Solenoid valves
• Threaded joints
• Pneumatic cylinder front covers
As operating time increases, internal pipe corrosion and aging seals further intensify leakage risks.
Practical Leak Detection Methods
• Ultrasonic Leak Detection
Using an ultrasonic detector to capture high-frequency “hissing” sounds that are inaudible to the human ear. This method is especially effective in noisy environments or for detecting leaks in elevated or concealed areas.
• Soap Water Test
Applying soapy water to suspected leak points and checking for bubbles. This traditional method is simple and effective for visible and accessible areas.
• Sectional Pressure Test
By closing valves in different sections of the system and observing pressure drop rates, leak locations can be quickly narrowed down.
Quantifying Leakage
Leakage levels can be measured using the air receiver volume method. After determining the total system volume, shut down all air-consuming equipment and record the time required for the pressure to drop by a specific amount. This data can be used to calculate the total leakage rate.

02 Air Purification: The Key to Ensuring Air Quality
Compressed air leaving the compressor often contains moisture, oil, and solid particles. These contaminants can corrode pipelines, damage pneumatic equipment, and negatively impact product quality.
Among them, moisture is the most dangerous hidden threat. As compressed air cools in the pipeline, water condenses and causes internal corrosion, leading to rust, oil sludge, and debris buildup. In cold environments, frozen condensate may even crack pipes and fittings.
Effective Purification Measures
• Regular Drainage
At least 2–3 manual drain operations per week should be performed on air receivers, filters, dryers, and low points in the piping system. Ensure automatic drains are functioning properly.
• Filter System Maintenance
Regularly inspect and replace filter elements. A standard filtration setup usually includes 3 μm, 1 μm, and 0.01 μm filters to meet different air quality requirements.
• Dryer Inspection
Ensure refrigerated or desiccant dryers operate correctly and maintain compressed air at an appropriate dew point.

03 Systematic Maintenance: Building a Long-Term Management Strategy
Establishing a regular maintenance plan is the foundation of stable system operation.
• Conduct comprehensive leak inspections and repairs quarterly
• Perform thorough system inspections annually or semi-annually
• For systems operating over 10 years, maintaining a leakage rate of 10%–12% is a reasonable target
Optimizing pipeline design and materials can further reduce long-term issues. Replacing traditional branch-type layouts with looped piping systems helps minimize pressure fluctuations and eliminate dead-end water accumulation. Using corrosion-resistant materials such as aluminum piping effectively prevents internal rust and extends service life.
Maintenance records are equally important. Documenting inspection dates, maintenance content, and identified issues helps establish an equipment health profile, enabling predictive and preventive maintenance.

Conclusion
Compressed air piping system maintenance is not about “fixing problems after they occur,” but about systematic and preventive care. By applying scientific leak detection methods, ensuring proper air purification, and implementing structured maintenance schedules, companies can maintain consistent air quality and provide stable power for production.
A reliable system is built through maintenance.
This investment is far more economical than the energy losses and repair costs caused by air leakage and contamination.