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Oil-injected screw compressors

10 March 2008

The latest range from compressor manufacturer CompAir offers more in the way of energy savings and efficiency, and less in terms of cost of ownership and space usage. The new range represents a total re-design of CompAir’s L-Series 90 to 132kW oil-injected screw compressors.

The key principle applied to the re-design was to reduce the overall cost of ownership while delivering the highest air outputs. Jeremy Sykes, managing director of CompAir UK and Ireland, explains: “Energy usage, operational performance, parts inventory and maintenance demands all impact on the total cost of ownership of a compressor. With our existing L-Series range we had well-proven design principles, so the objective was to develop these to raise the overall benchmark. What we have achieved with the re-design is a range of gear driven compressors that is better in every way: increased air output, reduced parts and maintenance requirements and higher environmental credentials. The additional bonus is that we have packaged all of this into a smaller frame, substantially reducing the compressor footprint.”

With power consumption of a compressor being up to 80% of the lifetime cost, energy efficiency was a primary requirement. The new fixed speed models deliver up to 15% more air for the same power input than previous models, while the L132kW Speed Regulated (SR) variable speed version offers even greater energy-savings.

The SR energy savings are achieved by an innovative motor design that offers better performance and long term reliability than alternative inverter style variable speed drives. On a typical 132kW installation operating two shifts, this can mean energy savings of £11,000 based on average energy costs compared to a fixed speed approach.

As well as re-designing key components, CompAir has reduced the overall component content of the L-Series compressors by 20%. One such example is the Alpha air end EK230, which has an integrated oil filter and thermostatic valve, reducing the number of tubes and hoses that require routine replacement. The low-speed air-end, radial fan and a noise damper at the cooling air inlet also ensure quiet running, with noise levels starting from 73dB(A) on the L90 model enabling the machines to be installed in areas without the need for ear protection.

Cost-effective operation is matched by ease of maintenance. All the doors are fully removable and major components are arranged to allow easy access for routine servicing, which contributes to reduced machine downtime.

The exceptionally small 3.2m² footprint means that the new design needs almost a third less floor space than comparable models. By paying attention to air circulation within the unit, CompAir has ensured that the machine runs cool, which contributes to prolonged compressor life. With highly efficient heavy-duty intake filters, only high quality air enters the air end.

To complete the package, the L-Series compressors carry CompAir’s Assure free extended warranty scheme, which gives peace of mind for up to 44,000 hours operation.


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