Normally, the TG rotor is a heavy mass and rests on the bearings, when no
steam is admitted to Turbine. In order to prevent metal to metal
contact/erosion during initial steam admission, the rotor mass is lifted
(Jacked up) slightly away from bearing metal thru thin film of high pressure
Oil.Baring Gear is the motive force to Rotate the TG rotor in slow speed. This
is needed to faciliate easy rotation of TG on steam admission. The TG rotor is also
put on barring on Turbine stop to assist in uniform cooling of rotor mass until
the turbine metal reaches the room temperature.
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