Oil Vs. Oilless Air Compressor

Oil and oilless air compressor both use oil, but vary in function and design.

Air compressors refer to devices used to convert electrical gas or power into kinetic energy via the pressurization and compression of air. Air compressors can take the form of oil or oilless systems.

Maintenance

Oil air compressors use oil to lubricate the pistons and other compressor components that compress and pressurize air. Oil in oil air compressors can be lost due to leaks and general operation, necessitating monitoring to ensure proper working levels. Oil in oil air compressors must also be monitored for quality, as sediment or sludge can accumulate in inlets, negatively impacting system function. Oilless air compressors also use oil for lubrication, but the level remains constant and requires no maintenance.

Cost

Oilless compressors, smaller and less powerful than oil-based air compressors, typically range in cost from a few hundred dollars to nearly $1,000 (as of January 2011). Oil compressors, which require higher amperage, range in cost from about $500 to $1,500.

Heat Resistance

Oilless air compressors use Teflon-coated cylinder sleeves and piston rings to reduce friction, however excess heat buildup can still occur in the compressor, impairing system function. Oil-based air compressors contain an aluminum crankcase and head which aids in heat dissipation.

References

• 360 Machine Tools: Air Compressor Buyer's Guide: Air Compressor Buyer's Guide: Air Compressor Buyer's Guide: Everything You Need to Know
• "Union Engineering Handbook: Pumping machinery, air compressors, condensers"; Earl P. Ordway; 2010

Resources

• "Compressed Air Operations Manual"; Brian S. Elliott; 2006