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Thursday 25 September 2014

TURBINE AUXILIARIES (OIL SYSTEM -LUBE ) PART-II ABC OF THERMAL POWER PLANT

PART-II

OIL SUPPLY DATA FOR A TYPICAL 500MW SET MANUFACTURED BY 

BHEL

MAIN OIL TANK, RATED CAPACITY:                       25/40             Cu . M

Ist OIL FILLING (ESTIMATED):                                   47.5                Cu . M

FLUSHING OIL QUANTITY (ESTIMATED):               28.5              Cu . M

OIL TEMP. AT COOLER OUTLET,                               38 TO 45 DEG C.


TEMP. RISE OF OIL IN BEARINGS                              20 TO 25 DEG C

OIL PUMPS

M.O. PUMP     A.O. PUMP       E.O. PUMP                         J.O.PUMP

      1                      2                          1                                  AC : 2             DC : 1
                                        
                                             CAPACITY (RATED)
      
    75                     89.25                     30                                    1.53              dm3/s
                                               
                                   DISCHARGE PRESSURE (GAUGE)
       
    8.6                     6.2                        2.3                                   178                 BAR
                                                           
                                                       SPEED

    50                   24.75                       24.3                                49.42                         /s

A Few erection points need to be remembered during erection of Lube line of turbine

1. Lube system includes jacking oil line. Jacking oil is used to lift rotor from bearing 

during starting .

2. As these lines requires lot of small items including fastners , o-ring , gasket, small 

bore pipes , prefabricated pipes, valves ,supports  etc a systematic material 

management is required to reduce the time cycle. No pipes to be kept open at the end. 

All pipes to be cleaned by compressed air before erection.

3. To start the work oil canal and oil room front availability is must.

4. All the pipelines joints small bore / large diameter should be tig welded in root.

5. Temporary pipes required for oil flushing to be made during erection itself so that 

last minute fabrication is not necessary.

6. Match up, weld and examine the prefabricated connecting pieces of the discharge 

and suction nozzles prior to the final erection of the first bearing pedestal.

7. Other matching and welding work to be done when the bearing pedestal is full 

assembled.

8. The direction of flow of the oil temperature control valve should be ensured as 

indicated by markings on the valve itself.

Jacking Oil Lines

9. Once the line has been welded to the bearing pedestal, fit a protection plate to 

protect the line in this area.

10. Ensure that oil vapor extraction lines are laid with a gradient descending constancy 

towards the main oil tank without low points. A drain loop at the lower end of this line 

upstream from the blowers return drains to the oil tank.

11. To avoid fire hazards, do not route oil lines near lines or components at high 

temperature.

Oil tank with pump motor on the top.


Typcal 500MW lub oil scheme is given above ( BHEL make sets) 

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3 comments:

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