Answer Posted / devanesan

1.Misalignment.
2.Loseness in Bearing mountings.
3.Rotor rubbing with stationary parts like sealing fins or
oil guard.
4.water partical entering into the turbine(due to improper
warming up of turbine and pipelines.
5.back pressure increasing due to steam flow path volume
reduction(silica deposition in fix blade.)
6. unbalence of rotor.
7. obstractions in the free expanding parts of turbine and
its associated pipe lines.
etc.....

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