air compressors are the more common compressor used in industries today.
Inherently by design they are approximately 25% more efficient than a
reciprocating "piston" type of air compressor. Sizes of the rotary
screw now very from five horse to several hundred. Discharge pressures
can now range upwards of 350 PSIG. At approximately 10
horsepower, a rotary screw type of air compressor will cost about the same as a
good quality reciprocating unit.
or piston type of air compressors, although less efficient than a rotary
screw most assuredly still have a position in the marketplace. The
most common use today is small applications, as well as low flow and
high-pressure applications. Due to the ease of multiple staging of
the reciprocating air compressor, these units can easily be designed to
drive compressed air discharge pressures to as high as 9000 PSIG.
Pressure lube and the standard splash lube are both available.