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It has been observed that a phenomenon known as "transient vibration "sometimes occurs in centrifugal compressorswith between bearing configuration during start- up just after a short shutdown. The phenomenon iscaused by a thermal induced bow which is similar to rotor bow occurring in large steam turbines during start-up.The occurrence of this phenomenon depends on certain operating conditions and loop configurations of centrifugal compressors. The temporary rotor bow may cause rotor -stator rubbing due to vibration at high amplitude during restart of compressor inthe hotcondition.This write up endeavors to provide a guideline about when a method to assess sensitivity to rotor bow during testing of compressors at manufacturer's test bed.Without identifying the potential severity of this issue it is very cumbersometo change design or implement protective logics in system.

Identification of Probability of thermally induced Transient Vibration in CentrifugalCompressor