TL09 - Dynamics of Modular Rotors in High Speed Centrifugal Compressors: Design, Operational Performance and Field Serviceability

Abstract

Turbomachinery depends on optimal rotor-bearing systems for reliable operation. One type of rotor construction is the concept of modular rotors. While gas turbines have implemented this concept extensively, there has been a steady acceptance of modular rotors in gas compressors in the recent past. End-users have experienced the mechanical reliability, ease of re-staging and high operational availability of compressors with modular rotors for their mission-critical operations. This lecture presents key rotordynamic attributes of centrifugal compressors with modular rotors. Mechanical performance, sensitivity to unbalance, balance repeatability and rotordynamic stability are shown. Historical data on vibration from compressors operating in the field have been presented to validate the design, construction and operation.