Your rotary screw compressor starts running hotter than usual. Or it struggles to keep up with demand it handled easily last year. Maybe it just clocked 40,000 hours. Now you face a question that every facility manager dreads: repair it, or replace it?
Both answers cost money. However, the wrong answer costs much more. CFM Air Equipment helps Alberta businesses think through this decision every week, and the process is more straightforward than most people expect.
Start With the Air End
The air end is the heart of a rotary screw compressor. Specifically, it maintains efficiency right up until its bearings start to fail. Depending on design and operating speed, an air end can last 30,000 to 80,000 hours before needing a rebuild.
Complete air end failure is expensive. The rotors can seize, castings can crack, and worn components become scrap. Furthermore, catching the problem early — when you notice higher operating temperatures, noisier operation, or difficulty keeping up with demand — means you can rebuild rather than replace. CFM Air Equipment’s expert compressor service technicians perform air end overhauls that restore like-new performance at a fraction of factory-rebuilt unit costs.
Signs That Repair Makes Sense
Consider repair when your compressor meets most of these criteria. First, the frame and motor are in good condition. Second, the unit has fewer than 60,000 hours on the air end. Third, the failure is isolated to a specific component — a valve, a separator, a cooler — rather than systemic wear.
In those cases, sourcing the right compressor parts and rebuild kits and completing a targeted repair protects a significant capital investment. CFM Air Equipment carries OEM and aftermarket parts for all major brands, including Kaeser, Ingersoll Rand, Sullair, Atlas Copco, and Gardner Denver.
Signs That Replacement Makes Sense
Replacement starts making financial sense when repair costs exceed 50–60% of a new unit’s price. Additionally, if your compressor runs on an outdated control system, lacks variable speed capability, or consistently fails to meet modern efficiency standards, a new unit will pay back the investment through lower energy costs.
Technology has advanced significantly. Specifically, variable speed drive compressors adjust output to match demand in real time, cutting energy use by 30–50% compared to fixed-speed units. Therefore, replacing an aging fixed-speed unit with a modern variable-speed model often delivers a payback period of three to five years.
Plan for Downtime Either Way
Whether you repair or replace, your facility will experience some downtime. Consequently, planning that downtime during scheduled maintenance windows saves you from an emergency shutdown at the worst possible moment. For facilities that cannot afford any gap in air supply, a short-term compressor rental keeps production running while your primary unit is offline.
CFM Air Equipment maintains a rental fleet of electric units from 5 to 125 horsepower. Furthermore, every rental unit ships tested, serviced, and ready to install within hours.
Don’t Forget the Broader System
A compressor decision rarely lives in isolation. For example, if your facility also runs vacuum pump systems or relies on specific air products and ancillary equipment, a compressor upgrade is a good time to review the full system. Upgrading one piece without considering downstream equipment can leave bottlenecks in place.
CFM Air Equipment audits the complete compressed air system before recommending a path forward. In addition, the team provides honest, no-oversell recommendations — you get clarity, not a sales pitch.
The Bottom Line
Run the numbers. Compare repair cost against replacement cost, factor in energy savings from modern equipment, and weigh the risk of another failure in the near term. However, always get a professional assessment before committing.
CFM Air Equipment has operated in Western Canada since 1965. That experience means the team has seen virtually every failure mode on every major compressor brand. Get a proper diagnosis first, and the repair-versus-replace decision becomes much easier.
FAQs
How long does a rotary screw air end typically last? Most air ends last between 30,000 and 80,000 hours depending on design and operating speed. Therefore, a compressor running two shifts per day might reach that threshold in 10–15 years.
Is it worth rebuilding an old compressor frame? It depends on the frame condition, the cost of available parts, and how much life remains in the motor. However, CFM Air Equipment technicians can assess the unit and give you an honest cost-versus-replacement comparison.
What brands does CFM Air Equipment service? The service team works on all makes and models, including Kaeser, Ingersoll Rand, Sullair, Atlas Copco, Chicago Pneumatic, Gardner Denver, and many others.
Can I rent a compressor while mine is being repaired? Yes. CFM Air Equipment offers electric rental units from 5 to 125 horsepower. Specifically, units ship tested and ready to run, so your facility stays operational during repairs.
How do I know if my air end needs a rebuild? Watch for higher-than-normal operating temperatures, increased noise, difficulty maintaining pressure, or a significant increase in oil consumption. Furthermore, high hour counts — above 30,000 on faster units — are a signal to schedule an inspection before failure occurs.