Magnetic Bearing Retrofit Of A High Speed, Eight Stage Coker Compressor.
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The design, integration, and implementation of a successful project to retrofit a high speed, eight stage centrifugal compressor with magnetic bearings and gas face seals is presented. The application is removal of light gases from the top of a fractionating tower in a refinery coker unit. The justification and reasons for the selection of the coker compressor retrofitted with magnetic bearings are discussed. The technical aspects of design, rotordynamics and operation of the old oil bearing and seal design to the retrofitted magnetic bearing and gas face seal designs are compared. The tuning of the magnetic bearings is also discussed along with startup and operation of the compressor running on magnetic bearings. The significant challenge associated with retrofitting a compressor with magnetic bearings previously running on oil bearings is addressed from a design consideration and rotordynamics point of view. The development of assembly/disassembly techniques and manufacturing methods special to a magnetic bearing retrofit are described. Also presented is the logistics of meeting the short lead time and narrow turnaround window of 12 days at the user's facility
Choudhury, Pranabesh De; Watson, Andrew P.; Carter, Donald R.; Farabaugh, Chet (1993). Magnetic Bearing Retrofit Of A High Speed, Eight Stage Coker Compressor.. Texas A&M University. Turbomachinery Laboratories. Available electronically from