Abstract
This chapter provides an overview of compressors. It provides information about the common components of compressors, positive-displacement compressors and dynamic or centrifugal compressor. It also provides guidelines used for the selection process of compressors. A compressor must operate within a system that is designed to acquire and compress a gas. The lubricating system for centrifugal or dynamic compressors is designed to provide bearing lubrication. In smaller compressors, the lubrication systems may consist of individual oil baths located at each of the main shaft bearings. In larger compressors, such as a bullgear design, a positive system is provided to inject oil into the internal, tilting-pad bearings located at each of the pinion shafts inside the main compressor housing. Positive-displacement compressors use their lubrication system to provide additional functions. The lubrication system must inject the sufficient quantities of clean fluid to provide lubrication for the compressor's internal parts, such as pistons and lobes, and to provide a positive seal between moving and stationary parts.
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