High vibration levels during the commissioning of industrial steam turbines
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During the individual testing of the industrial steam turbine, when the shaft end radial bearings exceeded the critical speed, the vibration value on one side was 57 microns, while it was 38 microns on the other side； At the rated speed, the vibration amplitude is 50 micrometers on one side and 36 micrometers on the other. The alarm value is 50, and the interlock value is 75 micrometers. Please help analyze the cause of the vibration based on the situation, and advise on how to deal with it.
Have the manufacturer recheck the dynamic balance and alignment
Was the cranking done before warming up? Has the warm-up time been reached?
A high critical vibration level is also normal. If vibration remains at the alarm level even when the normal speed is reached, it should be a cause for concern. Given that the situation you described is too simplistic, there are many reasons that can cause vibration ； Whether the pipes and machinery are properly warmed up, whether it is the first time the machine is started, rotor bending, etc ； If there is an online monitoring and analysis system, it is possible to take a close look at the spectrum and conduct targeted analysis