Thursday, 27 December 2012

TURBINE OILING SYSTEM



  1.  OIL SUPPLY

A single oil supply line lubricates and cools the bearing, governs the m/c and operates the hydraulic actuators and safety and protective devices.
During start-up & shut-down, aux oil pump supplies the control oil. Once the turbine speed is more than 2850 rpm, the main oil pump (M.O.P) takes over. It draws oil from main tank .The lubricating oil passes through oil cooler, before can be supplied to the bearing (Under emergency, lube oil can be supplied by a DC oil pump).Before the turbine is turned or barred, Jacking oil pump  (2 nos.) supplies high pressure oil to the jack up the TG shaft to prevent boundary lubrication and also supplies high pressure oil to drive the hydraulic motor(turning gear)

2)Turbine lubricating oil system

  •  Function:

          1. Provides a supply of oil to journal bearings to give an oil wedge as the shaft rotates.
          2. Maintains the temperature of turbine bearings constant at the required level.
         3. Provides a medium for hydraulically operating the governor gear and controlling the steam 
             admission valves.               
         4. Provides for hydrogen cooled generators a sealing medium to
             prevent hydrogen leaking out along the shaft.  
 

3)Main components

     1) Main Oil Pump
     2)Auxiliary Oil Pump
     3) Emergency Oil Pump
     4) Jacking Oil Pump
     5) Main Oil Tank (MOT)
     6) Centrifugal

3.1) Main Oil Pump
  •  This pump is located at the front bearing pedestal of the HP turbine.
  • It is coupled to the turbine rotor through a gear coupling.
  • When the turbine is running at a normal speed of 3000rpm, then the desired quantity of oil to the governing systems and the lubrication systems is supplied by this pump.
3.2)Auxiliary Oil Pump
  •  Auxiliary Oil Pump can meet the requirements of lubrication system under emergency conditions
  • One stage vertical centrifugal pump driven by an A.C. electric
    motor.
  • It has radial impeller and volute casing.
  •  The pump automatically takes over under interlock action
    whenever the oil pressure in the lubrication system fails below
    certain desired level. 
3.3) Emergency Oil Pump
  •  Emergency oil pump has been foreseen by as a back-up
    protection to AC driven standby oil pump.
  •  This is a centrifugal pump, driven by DC electric motor.
  •  This automatically cuts in whenever there is a failure of AC
    supply at power station
3.4)Jacking Oil Pump:
  •  JOP ensures that there is no metal contact between a journal
    and the bearing.
  •  Positive displacement pumps that provide high pressure supply
    of oil under strategic journals of the turbo generator and oil lifts
    the shaft slightly.
  •  This greatly reduces the static friction and bearing wear.
  • The JOP can be stopped after the lubricating oil film is
    established between the shaft and bearings.
  •  Pressure produced is 120 bars
3.5) Main oil tank
  •  The oil used for lubrication is stored in the Mai Oil Tank.
  •  Capacity -20/32 m3.
  •  The Main Oil Tank holds the oil inside the tank for a period long
    enough to ensure liberation of air from the oil.
  •  Filters are located inside the tank to filter the oil during its
    normal course.
  •  The oil tank is supported on a framed structure just below the
    turbine floor at the left hand side of the turbine.

 

7 comments:

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    ReplyDelete
  2. I appreciate your hard work that will make this blog valuable in the Vertical Turbine Pump Skid and other Tool.
    The great information provided by you with the help of your blog.
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    ReplyDelete
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    ReplyDelete
  4. Hello Sir
    Can some one post Single Diagram of Temporary GTG Oil Flushing.

    ReplyDelete
  5. There is also a DC operated Gear pump as an emergency pump in lube oil system. When does it some in to operation?
    It would make the write up even more informative if you include the typical working parameters of each pump described above.


    C S Cowlagi

    ReplyDelete
  6. Hye.
    Will the system be the same for steam or gas turbine?
    JOP - does it a requirement to have this and is there any other name as I cant remember we have JOP.

    I believe OVE is Oil Vacuum Extraction, can anyone elaborate on this?

    ReplyDelete
  7. This comment has been removed by the author.

    ReplyDelete