DETERMINING THE ROOT CAUSES OF …

DETERMINING THE root CAUSES OF SUBSYNCHRONOUS. INSTABILITY PROBLEMS IN TWO CENTRIFUGAL COMPRESSORS. by Ed Wilcox CVO Rotating equipment Team Lead Lyondell/Equistar Channelview, Texas and David P. O'Brien Principal Reliability Engineer Equistar Chemicals, LP. Clinton, Iowa The first problem occurred with a propylene compressor in a Gulf Ed Wilcox is the CVO Rotating equipment Coast chemical plant that had experienced high journal bearing tem- Team Lead with Lyondell/Equistar, in peratures for several years. A modified bearing was installed to Channelview, Texas. He is responsible for alleviate the temperature problem; however, a large subsynchronous troubleshooting, repair, and condition moni- vibration appeared after the new bearings were installed. A lateral toring of rotating equipment at both the stability analysis showed that the compressor with the modified Lyondell and Equistar facilities. Prior to bearings was very stable with the aerodynamic destabilizing effects this, Mr.

Ed Wilcox is the CVO Rotating Equipment Team Lead with Lyondell/Equistar, in Channelview, Texas. He is responsible for troubleshooting, repair, and condition moni-

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