Turbine Bearing Vibration at Start-UP
Turbine Bearing Vibration at Start-UP
(OP)
If you are starting up a steam turbine/generator and you have high bearing vibration, what checks should you perform to find and correct the problem? Thanks!!!!
RE: Turbine Bearing Vibration at Start-UP
If this is a one time problem and the vibration seen was high, you probably want to roll out the bearings and inspect them before you restart. If there is any damage to the bearings, confirm oil orifice location and sizing, oil pressure and temperature, and make sure that the oil drains are open and flowing freely.
RE: Turbine Bearing Vibration at Start-UP
RE: Turbine Bearing Vibration at Start-UP
Conditions of the start? Any repairs? Why was the turbine down to begin? Talk to the operators; they may know something based on how they started it. Enough slowroll?
Regards,
Bill
RE: Turbine Bearing Vibration at Start-UP
Already mentioned, rotor bow due to prolonged periods off of turning gear can cause rubs which cause vibration.
Rubs can cause localized shaft heating which can cause bowing which can cause vibration.
Slinging a balance weight can cause vibration.
Rotor winding shorts (if you are progressed enough through the start up to have synchronized and excited the field) can cause vibration.
Those should give you some food for thought.
rmw