Horizontal Shaft CL movement only on Steam Turbine Governor End

Recently witnessed a leftward horizontal shaft centreline movement of 130 um during low load operation of above 40MW extraction condensing Steam turbine. This movement happened on on governor or steam inlet end only. Bearing metal temprature increased from normally seen 80 c to max 120c but came back to 99c.

Currently at full load shaft position is still maintaining on left ward pad and radial vibration has subsided from 10 microm to 5 micron showing suppression by vaccinity to the clearance boundary.ANY THOUGHTS

 

 

 

 

Jonston

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