This course is designed to familiarize participants with basic concepts associated with the parts and operation of centrifugal and axial compressors. After completing this course, participants should be able to describe the main parts and the general operation of single-stage centrifugal compressors, multistage centrifugal compressors, and axial compressors. They should be able to describe the functions of compressor lubrication systems, seals, bearings, and common auxiliary devices.