Download the new Compressor2/18/2024 From 25 to 1,200 HP or 90 to 5,200 cfm, lubricant-free rotary screw compressors are available. Using externally lubricated timing gears, their relative clearances are kept within very small tolerances.Īn intercooler and an aftercooler are typically used in two-stage compression designs. The intermeshing rotors do not come into contact with one another in the dry type. When using two-stage compressors, the compression efficiency is increased by interstage cooling and the decreased internal losses brought on by a lower pressure across each stage. The majority of the liquid is separated using directional and speed changes.Īs a result, lubricant carryover occurs in some parts per million (ppm) of the compressed air due to separating the remaining aerosols. Lubricants used in lubricant-injected rotary screw compressors can be either synthetic or hydrocarbon-based.Ī mixture of compressed air and injected lubricant typically exits the air end and is routed to a sump where the lubricant is removed from the compressed air.
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