Analysis and on-stream countermeasures of sub-synchronous vibration of a centrifugal compressor

Case StudyThe sub-synchronous vibration could be attributed to many causes such as gas-whirl, oil whirl, looseness and so on. To prevent sub-synchronous vibration, manufacturer analyzes stability during design stage. But field condition can be changed because of process issues. Based on actual experience of sub-synchronous vibration in recycle gas compressor of MDU(Middle Distillation Unit) plant, this case study will show how to analyze and reduce vibration without compressor shut down by applying on-stream countermeasure