A rotary-screw compressor is a kind of gas compressor, such as for example an surroundings compressor, that runs on the rotary-type positive-displacement system. They are generally used to replace piston compressors where huge volumes of high-pressure atmosphere are needed, either for large commercial applications or even to operate high-power atmosphere tools such as jackhammers and influence wrenches. For smaller rotor sizes the inherent leakage in the rotors becomes much more significant, getting less useful than piston types for smaller volume air compressors.
The gas compression procedure for a rotary screw is a continuing sweeping motion, so there is very small pulsation or surging of flow, as occurs with piston compressors. This also allows screw compressors to end up being considerably quieter and produce significantly less vibration than piston compressors.
Ever-power Rotary Screw Air Compressor. 230 volt with built in air dryer and 80 gallon tank.Unit offers 13857hours on it. Unit was lately serviced with new separator filters, air conditioning filter, essential oil filter, and new oil. Unit has been examined and functions great. Free freight delivery. Feel free 
to contact me with any questions you may have.
Item specifics
Rated Voltage: 230 V
Brand:Ever-power
Rated Horsepower:15 hp (11 kW)
Power oil-free air compress Supply:Electric Airflow Volume (CFM): 60
Compressor Type:Rotary Screw
Air Tank Capacity: 80 gal
Motor Horsepower:10.5 to 30
Current Phase: 3 Phase