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Depending on what air is used for will determine the type of air compressor that is best matched for the task. There are several different uses for compressed air. Most common are to operate handheld pneumatic tools such as grinders, impact wrenches, or nail guns. Other applications require air to act as hydraulics like to move parts of equipment or an assembly line. Direct uses of air include blowing down tanks for cleaning or filling things like tires. Some applications have a much greater demand of air, for example, using compressed air for paint spraying, sand blasting, or blow-off cleaning.
Choose the right equipment for your application.
Reciprocating or Piston-Type
Reciprocating or Piston-Type compressors pump air by action of pistons. Drawing in air on the down stroke and discharging air on its upstroke. Reciprocating compressors can be single-stage or two-stage, while two-stages of compression creates greater efficiency. These compressors are designed to run for a period, and then have down time to cool.
Rotary Screw uses two helical screws that rotate with close clearances next to each other. Air travels through the grooves and is compressed as the channels volume decreases, which increases pressure. Rotary compressors have fewer moving parts and excellent cooling capabilities, meaning they can run 100% of the time without needing down time to cool. Oil is used to cool, lubricate, and seal the screws – which must be separated from the air after the compression cycle.
Rotary Vane compressors use an electrically spun rotor with slots to guide air into a discharge chamber, discharging a fixed volume of air at a higher pressure. Oil is used to cool, lubricate, and seal the bearings and vane – which must be separated from the air after the compression cycle.
Centrifugal compressors use high speed impellers to rotate at up to 60,000 rpm and accelerate the air, causing an increase in pressure. Centrifugal compressors are not positive displacement, but rather dynamic compression. Between stages, intercoolers cool the air and drain condensate to minimize impeller damage.
|Reciprocating||Rotary Screw||Rotary Vane||Centrifugal|
I’ve always had a recip at my shop, but the more and more I look at them, I may just have to check into getting a rotary screw!