ROTARY-SCREW AIR COMPRESSORS FEATURES

Although rotary-screw compressors are available in lower horsepower ratings, it would appear that it is in the 20 to 25 horsepower and higher range that many industrial compressor applications tend to move toward using a rotary-screw compressor solution instead of other types of compressors.

One major manufacturer states that the rotary-screw air compressor has become the most popular source of compressed air for industrial applications.

That may be because of the need for a compressor with a continuous duty cycle. Some rotary-screw compressor manufacturers claim a duty cycle of 24/7/365, which is pretty incredible for any electromechanical device.

Rotary-screw compressors are available with a direct motor-to-screw drive; others are belt driven. Each has its benefits and its own drawbacks, the details of which are best obtained from the actual compressor manufacturer.

Less Maintenance
The perception, one that is claimed by some manufacturers, is that rotary-screw units have the least maintenance issues of all types of air compressors and are touted as being the easiest to maintain in terms of both regular maintenance and unscheduled downtime.

Reputed for Lower Cost
When you move up into the higher horsepower units, rotary-screw units are reputed for their lower cost over a comparably sized reciprocating compressor, and further, they boast lower operating costs than either vane or reciprocating units.

Oil Carryover
Some manufacturers suggest their oil carryover from the compressor to the compressed air supply of the plant is calculated in parts per million per day, rather than the ounces or more of oil that can enter the plant-air stream from older reciprocating models and some well-used vane models.

Lower Operating Noise
Other firms suggest that their rotary-screw units boast a very low operating decibel rating, and claim noise output levels far below other types of compressors, an important issue to be considered for the benefit of workers in the area. It is our experience that the lower operating sound levels may not eliminate the need for a soundproof housing, unless the compressor is well equipped with sound-deadening cladding.

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