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ckoz

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Posts: 8
Reply with quote  #1 
Hello everyone,

we have 1 set HP/IP turbine and 2 sets LP turbine.
Total nominal output is 600 MW.

And during stable operation, turbine rotor vibrations fluctuate independently of operating parameter. Most of time vibrations dependents a operation parameter(like vacuum, gland steam, MS,RHS etc.) But this time we could not match any of them.

What could be the  reasons?
Regards
Caglar

Attached Images
jpeg c98edd50-2a2b-455c-a69b-69cf21cfb458.jpg (325.41 KB, 35 views)
jpeg BEAR?NG_LOCAT?ON.jpg (20.45 KB, 30 views)

Shoveldr

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Posts: 88
Reply with quote  #2 
I would start throwing process parameters on the that trend plot until you found something that correlated.  Load, valve position, steam pressure, vacuum, oil temp, etc.

Can you get spectrum, waveform and Orbit data on bearing 2?  Ideally monitoring it live.  The trend is more erratic than the other bearings and may be showing an instability in the bearing, either oil or steam related. 
John from PA

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Posts: 963
Reply with quote  #3 
In addition to what has been suggested as additional data, can you improve the data you have already presented.  It is impossible to read any of the scales on the screen.  

If you are using Windows you should be able to do a PrntScrn, then paste the image into Paint, and then save the image as a jpg for insertion.  There are other ways as well but without knowing what software you are using and the OS it would be speculation.  But it will be very difficult to help you the way you are presenting the data. 
vogel

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Reply with quote  #4 
More and better data is needed to diagnose this issue. In addition to what others have suggested, is this a recurring event or did it happen only once? Was the machine operating at full load during the event?

That picture looks like a Cimplicity screen. If it is, you probably want a dedicated vibration analysis software to analyze data (spectra, orbits, ...) in such a machine.
ckoz

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Posts: 8
Reply with quote  #5 
Thanks for replies
you can find attached orbits of first and second bearings
regards

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jpeg 1x-1y.jpeg (165.34 KB, 12 views)
jpeg 2x-2y.jpeg (145.04 KB, 12 views)

John from PA

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Posts: 963
Reply with quote  #6 
Quote:
Originally Posted by ckoz
Thanks for replies
you can find attached orbits of first and second bearings
regards


Are those orbits during the high vibration excursion?  Can you compensate the orbits for runout?

Is this a condensing or non-condensing turbine?
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