Tuesday, 16 January 2007 16:58

QRS air compressors offer many advantages over reciprocating compressors

Written by Rich Evans
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I recently added the Chicago Pneumatic QRS Quiet Rotary Screw air compressor to my shop because of its quiet operation, smooth and pulse-free air output, compact size, high output volume, low vibration, prolonged service intervals, and long life.

The QRS rotary screw package is built to be able to run continuously 24 hours a day, 7 days a week, if necessary. However, the built-in timed shutdown will stop the compressor and motor when compressed air is not needed, resulting in lower energy demands. In contrast, reciprocating compressors should be operated at a 70% duty cycle in order to not overheat the pump which could cause excessive wear or - even worse - failure.

The QRS HP (without refrigerated dryer) model supplies cleaner and cooler air than reciprocating compressors. Oil lubricates the bearings, seals between the rotors and cools the air during the compression cycle. This oil is cleaned by an oil filter and than taken out of the air by an oil separator resulting in clean air. Since the QRS does not create friction like a reciprocating compressor, and has a built-in cooling system, the compressed air is delivered at a minimum of 100 degrees cooler than reciprocating compressors, resulting in less moisture in the delivered compressed air.

With a refrigerated dryer, the QRS HPD cools the compressed air down to 39 degrees F, removing about 95% of the moisture that is in the compressed air. A refrigerated dryer is the most efficient method for removing moisture for paint spray applications. The QRS HPD is a perfect choice for body shops. Add a coalescing filter after the dryer, and the compressed air system is ready for every paint job.

And it is quiet

The sound levels of the QRS range from 61 dB(A) to 68 dB(A) for the 15 hp model, which is far quieter than any reciprocating compressor I have come in contact with. Therefore, the QRS can be located anywhere in the shop as long as it has a good air flow and is in a reasonably clean environment.

The QRS rotary screw design has no wearing parts, so the compressor life expectancy is 3 to 5 times the life of a reciprocating pump. The QRS is fitted standard with magnetic starter, motor overload protection, high discharge temperature shutdown at the compressor, control transformer with fused protection, and timed shutdown when compressed air is not needed.

The QRS is a completely packaged unit with compressor, tank and dryer, simply requiring a power supply to the compressor, the dryer and air line connection to your shop air system. It arrives factory assembled and tested, read to be installed simply by a qualified electrician. With no vibration, the QRS can easily be mounted on a mezzanine or above the office if desired.

High volume, lower pressure

The QRS is available from 3 hp to 15 hp, and shortly 20, 25 and 30 hp models will be available for shipment. Body shops require a high volume (cfm) of air but not as high a pressure as other applications, so starting at 10 hp, the QRS is available with 125 psig operating pressures (standard is 150 psig). At 125 psig, the QRS delivers 10% to 20% higher capacity (cfm) depending on the model.

Rotary screw air compressors have been in use in industrial plants for over 40 years, and have replaced many reciprocating compressors because of their reliability, serviceability, compact design and the ability to deliver high quality compressed air.

The ability of the QRS to run continuously when several grinders and sanders are operating, and not affect the paint spray booth makes the QRS an excellent compressed air system for body and paint shops.

"The QRS is the absolute best choice for every body shop that is serious about the quality of their work. The quality compressed air system provided by the QRS is the beginning of producing a quality automobile or truck repair," according to Peter Beers, western region sales manager for Chicago Pneumatic's Vehicle Service Division and a 20-year veteran in body and paint shop equipment.

For more information on Chicago Pneumatic or their products, contact Chris Gaither at (214) 707-4228 or see their website at www.cp.com.


Rich Evans, owner of Huntington Beach Bodyworks in Southern California, is an award winning painter and fabricator. Currently he is offering workshops at his facility so he can share his special techniques to other industry professionals. For more information about Evans, visit www.huntingtonbeachbodyworks.com

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