Vibration Spike During Start up of an Integrally Geared Compressor

Abstract

During workshop testing of a new 3-stage main air compressor, higher than expected vibration levels were detected at stage 1 and 2 at start up. They are high enough that the machine could not be brought to the full speed. This case study will cover the basic design of the compressor, the history of the problem, the root cause analysis, conclusions and corrective action.