New Turbo blower turbine vibration

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Thread Starter

abhijeet ghosh

While commissioning our new turbo blower, the turbine (decoupled with blower) was put in rolling. As per manufacturer (BHEL, India) we followed the start up curve. The vibration was at 23.6 microns and well within the range. After about 30 min the rear bearing vibration slowly and steadily increased from this level to 116 microns and it made the turbine to trip. The machine was again started after cross checking the vibration probes and this time both the front and rear bearing vibration started to increase and it tripped again. the turbine has been designed for 61 ata, 485 deg celcius but we were rolling at 42 ata, 418 deg. Please guide me to identify the problem and rectify it .
 
What does the manufacturer, BHEL, say about the problem?

Did the manufacturer recommend running the turbine un-coupled from the blower for any "break-in" period?

I know this is sometimes a practice that is done with large AC electric motors, but I've never seen this done with turbines for any purpose (blowers; boiler feed pumps; crude pumps; etc.).
 
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