Like all electro-mechanical equipment, oil-free rotary screw compressors require periodic maintenance to operate at peak efficiency and minimize unscheduled downtime. Inadequate maintenance can lead to lower compression efficiency, air leakage, pressure variability and other issues. All equipment in the compressed air system should be maintained in accordance with the manufacturers’ specifications.
Routine maintenance for oil-free rotary screw compressors
Oil-free rotary screw compressors require relatively minimal routine maintenance. With this type of compressor, the microprocessor control panel is responsible for monitoring the status of the air and lubricant filters.
Daily maintenance – Following a routine start, observe the various control panel displays and local gauges to check that normal readings are being displayed. Use previous records to help determine if current measurements are within the normal range. These observations should be made during all expected modes of operation (i.e., full load, no load, different line pressures and cooling water temperatures).
After initial 50 hours of operation – Essential readings of operating conditions should be verified and any necessary adjustments made.
Every 3,000 hours of operation – The following items should be checked every 3,000 hours of operation:
- Check/change the lubricant charge and filter element.
- Check/change the air filter element.
- Check/change sump breather filter element.
- Check/clean control line filter element.
- Check/clean condensate drain valve.
- Check the condition of shaft coupling element and tightness of fasteners.
- Measure and record vibration signatures on compressor, gearbox and motor.
- Annual rebuilding of the inlet is normally recommended.
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Source: thecompressedairblog
