TURBINE BARRING GEAR / TURNING GEAR OPERATION
Hot turbine rotor and generator shaft is slowly rotated for uniformly cooing down rotor shafts to avoid distortion or bending. Also its operation is used when Turbine generator rotor is shut down for a prolonged period. Periodic turning gear operation is used to rotate shaft position so that because of rotor weight hanging at bearings do not deform downwards at its centre of gravity.
Jack oil system
Turbine &Generator rotor is slightly lifted from its bearing position to reduce the starting torque requirement to rotate rotor at its initial running moment. A positive displacement pump of High pressure is used to supply oil to bearings to jack the rotor system.
Turbine Lube oil requirement
Turbine bearings are force lubricated system, in which lubricating oil is forced into the bearings to maintain lubrication requirement between static and rotating parts of bearings. Lubricating oil pump(s) are separately mounted to a lubricating oil tank which pumps oil to bearings and which is re circulated by suitable oil piping system, and its accessories. Hot oil after lubrication returns to tank which passes through a oil cooler to reduce oil temperature and again used in bearings. Suitable oil filters, suction filters, Oil injectors are the necessary arrangements to fulfill the systems certain needs of oil purifications, positive oil supply to pump suction, which is as discussed hereunder.
One oil pump (MOP) is either directly mounted or through gear arrangement at the turbine generator rotor system is used. When turbine attains its rated speed around 85% it started pumping lubricating oil in the system instead of the one placed outside(AOP), thus reducing power consumption.
Emergency Lubrication System
When in any case AC supply of the Force lubricating pump is not available or any breakdown of the pumping unit another DC motor driven pump is used as Emergency Oil Pump which starts and starts supply of Lubricating Oil to bearings. This is an emergency measure and suitably incorporated in the system for automatic start
Over Head Oil Tank
This is also a emergency measure of Lube oil supply to bearings in which lubricating oil is continuously stored in a overhead mounted oil tank which can supply oil by gravity to bearings in case both pumps fails to supply lube oil in the rotating shaft.
Hot turbine rotor and generator shaft is slowly rotated for uniformly cooing down rotor shafts to avoid distortion or bending. Also its operation is used when Turbine generator rotor is shut down for a prolonged period. Periodic turning gear operation is used to rotate shaft position so that because of rotor weight hanging at bearings do not deform downwards at its centre of gravity.
Jack oil system
Turbine &Generator rotor is slightly lifted from its bearing position to reduce the starting torque requirement to rotate rotor at its initial running moment. A positive displacement pump of High pressure is used to supply oil to bearings to jack the rotor system.
Turbine Lube oil requirement
Turbine bearings are force lubricated system, in which lubricating oil is forced into the bearings to maintain lubrication requirement between static and rotating parts of bearings. Lubricating oil pump(s) are separately mounted to a lubricating oil tank which pumps oil to bearings and which is re circulated by suitable oil piping system, and its accessories. Hot oil after lubrication returns to tank which passes through a oil cooler to reduce oil temperature and again used in bearings. Suitable oil filters, suction filters, Oil injectors are the necessary arrangements to fulfill the systems certain needs of oil purifications, positive oil supply to pump suction, which is as discussed hereunder.
One oil pump (MOP) is either directly mounted or through gear arrangement at the turbine generator rotor system is used. When turbine attains its rated speed around 85% it started pumping lubricating oil in the system instead of the one placed outside(AOP), thus reducing power consumption.
Emergency Lubrication System
When in any case AC supply of the Force lubricating pump is not available or any breakdown of the pumping unit another DC motor driven pump is used as Emergency Oil Pump which starts and starts supply of Lubricating Oil to bearings. This is an emergency measure and suitably incorporated in the system for automatic start
Over Head Oil Tank
This is also a emergency measure of Lube oil supply to bearings in which lubricating oil is continuously stored in a overhead mounted oil tank which can supply oil by gravity to bearings in case both pumps fails to supply lube oil in the rotating shaft.
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