In industrial applications, oil flooded rotary screw air compressors are the most popular. There are many myths about rotary screw compressors that seem to be based around the concept of winterizing. Cold weather does cause problems that are unique to this type of compressor and these problems can be very expensive. However, these problems can be avoided by following some simple rules.

Many people think that because their compressor is inside a heated building, it will not be affected by outside air temperatures. This is not true, because the oil coolers are often vented to the outside of the building. Oil that is trapped in a cooler that is exposed to cold air can become thick and will not circulate. Some rotary screw air compressors have thermal or bypass valves in the oil cooling system. This helps protect the compressor parts during startup in cold weather.

The valve must be checked regularly to ensure that it is operating properly. Synthetic oil can be a good help because it will circulate easier at low temperatures. However, the real problem is water build up in the oil sump because the water will not boil off and evaporate when the compressor is working under 140 degrees F. Problems caused by the water buildup can be avoided by occasionally draining a small amount of oil during cold weather before starting the compressor up.

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