Rotary Screw
Rotary screw compressors operate on the principle of positive displacement. Filtered air enters the inlet of the airend where two rotors un-mesh. As the rotors re-mesh, the space is reduced on the opposite side of the airend and thus, the air is compressed and moved to the discharge port.
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Reciprocating
Reciprocating compressors are a positive displacement machine, which means using a piston within a cylinder they increase the pressure of the air by reducing its volume, thus taking in successive volumes of air that is confined within a closed space and elevating this air to a higher pressure.
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Centrifugal
Unlike Rotary and Reciprocating air compressors, which are positive displacement systems, a Centrifugal compressor is known as a "dynamic" system. A dynamic compressor raises air pressure using an impeller to impart radial flow and a diffuser to convert the residual velocity energy to pressure energy.
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Oil-Free
Oil-Free compressors are available as rotary screw, piston, and centrifugal designs. The rotary screw utilizes specially designed air ends to compress air without oil in the compression chamber; the centrifugal is oil-free by design with oil lubricated running gear separated from the air by shaft seals and atmospheric vents.
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Packaged Air Systems
In recent years, various manufacturers have been stepping up their design and production of "packaged" air systems. It might be more correctly defined as "pre-packaged" systems. These come from the factory with many of the complimentary components for a complete system already mounted on a skid, ready for installation.
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PET Packaged Systems
Hope Air Systems has over 30 years experience in designing skid-mounted PET package systems to meet a wide range of requirements, including expanded focus on offerings from 1,000 L/M to 40,000 L/M at 40Kg. We have extensive experience with every type of installation, including screw/booster, reciprocating 3-stage, centrifugal, and oil-free screw booster systems.
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