Answer / 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.....

Answer / vijaya bhaskar reddy

Vibrations in the turbine occure due to the some
misalignments in the mounting stage.

natural frequency should be higher than the external
excitation erequency to avoid the dangerous phenomenon resonance

Answer / bejoy

yeah right..every rotor howmch ever care taken cannot be
properly placed or properly balanced..it could be minimised
by adjusting the mounting and mass distribution at a given
configuration dynamically by operating it at its maximum
speed..at its natural frequency it still vibrates high..
so the main causes of turbine vibration are
unbalancing,fluid flow instabilities & mounting problems..
fluid flow problems effect greatly the axial vibrations..

Answer / t. chandra shekhar

Centering of bearing
Misaligned
Shaft to center axis
Un balance of rotor
Not maintained interference in between bearing and housing
Not maintained in holding down bolts

Answer / shardul raghuvanshi

According to me the main cause of turbine vibration as
follow-
1)due to lube oil system not working proper.
2)due to disalingment of turbine rotor.
3)changing in the nature of lube oil.
4)due to some water particle on the turbine blade.
5

Answer / gyanaranjan rout

1. If there is any problem duing the the erectioning and commisioning.
2. Over heating of stator and rotor component.
3. Breakge of Turbine blade inside the turbine.
4. Clearence between fix blade and moving blade become less.
5. Neglating in maintenance of turbine.

Answer / anil shukla

1.misalignment .2.coupling bolts loose.3.not fallow proper heating & barring process. 4.bearing clearance less/more 5.foreign material enter in journal bearing.6.back presser develop in turbine.7.oil pressure not maintained as per require.8.load increasing slowly.

Answer / karthick

the rotor of the turbine will be made up of some material
and that material will have its own natural frequency if
the rotor of the turbine exceeds the
natural frequency then the turbine will be subjected to
vibratiion it may cause damage to turbibe
rotor

Answer / ashish kumar

1)inertia of the rotor blade
2)due to unusual supply of steam

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