Hidden Causes of Air Compressor Downtime | Prevention Tips

1. Rotary screw air compressors overheat when the oil is low, or the air/oil
coolers are blocked:

Regular maintenance is essential to preventing overheating—one of the most common causes of air compressor downtime.
You might also consider checking for other potential causes, such as:

• Low Oil Levels
Check the oil level in your unit daily. Insufficient oil can reduce lubrication and cooling,
increasing the risk of overheating.
• Air/Oil Coolers
Clean your air/oil coolers weekly to prevent dust buildup. Blocked coolers reduce heat
dissipation and cause temperature spikes.
• Cooling Fan
Ensure the cooling fan is functioning correctly. A faulty fan will compromise airflow and
cooling efficiency.
• Improper Ventilation
If your compressor is installed in a confined or poorly ventilated space, heat may not
dissipate effectively. Make sure there’s adequate airflow around the unit for proper
ventilation.

2.Condensate Problems That Lead to Compressor Failure and Downtime

Moisture buildup is one of the hidden risks that can lead to air compressor downtime if not properly managed. Below are common causes and what to check:

• Air Dryer Not Working
Ensure your air dryer is operational and cooling the air effectively to a dew point of +3 to
+6°C. A malfunctioning dryer is often a primary cause of excess moisture in the system.
• Inline Filtration
Proper inline filtration is essential for removing moisture and contaminants. Check if
your system has adequate filters in place and whether the filter elements have been
replaced recently. If you’re unsure or need replacements, contact us for a quote on new
filters or servicing of your current units.
• Auto Drains
Inspect all mechanical or electronic auto drains to confirm they are functioning correctly
and discharging moisture as intended. Faulty drains can quickly lead to condensate
buildup.

• Improper Piping System
The layout and design of your piping play a vital role in managing moisture. Piping
systems without proper slope or drain points can cause condensate to accumulate in
low spots. We recommend a system assessment to identify and resolve any piping
issues.

3. Low air pressure: Low air pressure in your compressed air system can be
caused by several key issues.

Addressing these proactively can improve efficiency and avoid costly downtime:

•  Improper Piping System
  The design and installation of your air lines play a critical role in system
  performance. Poorly installed or undersized piping can create flow restrictions
  and pressure drops throughout your plant. Contact us to assess your piping
  layout—we can offer expert advice and solutions to optimize your system.
•  Incorrectly Sized Air Compressor
  An air compressor that is too small for your operational demands can result in
  insufficient pressure. Ensuring that your compressor is correctly sized for your
  current production needs is essential for consistent performance.
•  Blocked Inline Filters
  Clogged or dirty inline filters can restrict airflow and cause pressure drops
  downstream. Regular inspection and maintenance of filters is crucial to
  maintaining optimal system pressure.

4. How can you save money:

Upgrade your unit to VSD – Upgrading your system to a Variable Speed Drive
(VSD) can significantly reduce your energy costs. In South Africa, we are billed
based on our peak demand. Traditional star/delta units cause a spike in energy
usage every time they start up, and that spike sets your peak demand rate,
meaning higher energy bills.
A VSD eliminates this issue by gradually ramping up the motor speed, avoiding
sudden spikes during startup. It also ramps down as required, adjusting the
power usage based on your actual pressure demand. This means you’re not
consuming the full kW rating of the unit at all times—only what’s
needed—resulting in reduced kWh usage and substantial energy savings.