Centrifugal compressors, also known as turbo-compressors, are designed to offer an advanced life cycle cost with lower maintenance due to its simpler structure and maintaining of a steady flow, subjecting the unit to less vibration and noise. The designation of centrifugal implies that the gas flow through the compressor is radial, and that the energy transfer is caused from a change in the centrifugal forces. These systems provide high flow rates with relatively low maintenance requirements. The lubricant in these units do not come in contact with the air stream resulting in ISO 8573-1 (2010) Class 0, 100% oil-free air downstream. Differences in Centrifugal Compressor Bearing Technology C