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LUBE OIL SYSTEM
LUBE OIL SUPPLY TO BEARINGS FOR
LUBRICATION AND COOLING OF
TURBINE, GENERATOR AND EXCITER
BEARINGS
LUBE OIL ACTS AS A MOTIVE FORCE
FOR HYDRAULIC BARRING GEAR
DURING START UP AND SHUT DOWN
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LUBE OIL SYSTEM
JACKING OIL SUPPLY TO LIFT TG
ROTORS IN THE BEARINGS DURING
START UP AND SHUT DOWN
OIL VAPOUR EXHAUSTERS TO
REMOVE OIL VAPOUR FROM BEARING
PEDESTALS AND MAIN OIL TANK
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LUBE OIL SYSTEM
THIS CONSISTS OF FOLLOWINGEQUIPMENTS
MAIN OIL TANK
MAIN OIL PUMP (TURBINE DRIVEN)
AUXILARY OIL PUMP (2X100% AC OPERATED) EMERGENCY OIL PUMP (1X100% DC OPERATED)
JACKING OIL PUMP (2X100% AC / DC OPERATED)
OIL VAPOUR EXHAUSTERS (2X100%)
OIL COOLERS (2X100%) DUPLEX OIL FILTERS (LUB OIL & JACKING OIL)
SEAL OIL STORAGE TANK
TEMP CONTROL, BUTTERFLY, PR LIMIT VALVES
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LUBE OIL SYSTEM
SYSTEM IS DIVIDED INTO
THREE SUB-SYSTEMS
OIL SUPPLY AND RETURN
JACKING (LIFTING) OIL
MISC DRAINS AND VENTS
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LUBE OIL SYSTEM
OIL SUPPLY AND RETURN DURING START UP & SHUT DOWN, AOP RUNS MOP TAKES OVER AT 2800 rpm ADEQUATE SUCTION PRESSURE TO MOP
CREATED BY 2 INJECTORS TO AVOID CAVITATIONIN MOP DISCHARGE PRESSURE OF MOP/AOP IS 8 BAR OIL SUPPLY TO BEARINGS ROUTED THROUGH OIL
COOLER & TEMP CONTROL VALVE TO MAINTAIN
OIL SUPPLY AT 45 DEG C DUPLEX OIL FILTER DOES NOT ALLOW SOLIDPARTICLES (>37 MICRON) TO BEARINGS
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LUBE OIL SYSTEMOIL SUPPLY AND RETURN
EOP (DC OPERATED) DISCHARGES OILDIRECTLY TO BEARINGS IN THEEMERGENCY POWER MODE
BEARING OIL RETURNS TO MOT THROUGH
GRAVITY DRAINAGE DUE TO HIGH HYDROGEN
CONCENTRATION, RETURN OIL FROMGENERATOR BEARINGS IS PASSED VIA
SEAL OIL STORAGE TANK TO DEGASIFY ITBEFORE RELEASING TO MOT
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LUBE OIL SYSTEM
JACKING (LIFTING) OIL DURING START UP & SHUT DOWN, JOP RUNS TO
LIFT TG ROTORS FOR BARRING OPERATION JOP IS A SCREW TYPE PUMP AND DICHARGES OIL
AT 180 BAR ONE OF THE TWO JOP IS DC OPERATED TOENSURE OIL SUPPLY TO BEARINGS IN THEEMERGENCY POWER MODE
JACKING OIL SUPPLY TO BEARINGS ROUTED
THROUGH A PRESSURE LIMIT VALVE TO ENSUREOIL SUPPLY AT A CONSTANT SET PRESSURE OF178 BAR
JACKING OIL FILTER ALSO RESTRICTS SOLIDPARTICLES (>37 MICRON) TO BEARINGS
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LUBE OIL SYSTEM
MISC DRAINS & VENTS OIL VAPOUR EXHAUSTER CREATES A SLIGHT
NEGATIVE PRESSURE IN MOT, BEARING SHELLSTO ELIMINATE POSSIBILITY OF ANY FIRE HAZARD
OIL PURIFIER SEPARATES SOLID PARTICLES &WATER CONTENT (UPTO 500 PPM) FROM OIL ANDTHUS SUPPLY CLEAN OIL TO THE SYSTEM
DRAINS & VENTS ARE PROVIDED TO SEVERAL OILEQUIPMENTS SUCH AS OIL COOLER, DUPLEX OILFILTERS, MOT, ETC TO FACILITATE HASSLE FREEDRAINAGE FOR REPAIR & MAINTENANCE WORKAND PROPER VENTING DURING START UPENSURE BUBBLE FREE OPERATION OF LUB OILSYSTEM
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TG Rotors
EXC
HP ROTOR : 16.3 T
IP ROTOR : 23.1 T
LP ROTOR : 90.0 T
GEN ROTOR : 68.0 T
EXCITER ROTOR : 7.55 T
HP I P L P
1 2 3 4 5 6 7
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Injector
IPT LPTHPTGen
MOP
JOP
Oil cooler
Filter
AOP
EOP
MOT
Vap. Ext
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Lube Oil Piping: in Oil Room
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Lube Oil Piping: in Oil Room
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Lube Oil Piping: in the Oil
Canal
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LUBRICATION
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HYDRODYNAMIC LUBRICATION
Turbine bearings are hydro dynamically Lubricated.
For this to happen following things are important
1. Viscosity of oil which is directly related to the oil
Temperature.
2. Rotation/speed of the Rotor.
3. Desired Clearances/Converging Wedge in theBearings. (convergence should be in the direction of
rotation)
In fact the Pressure of the Lube oil is mainly just
to ensure that oil reaches the Bearing. However it
is also very important and requires to be
maintained as per design.
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LUBRICATION As rotor rotates at low speed ,initially there is no
film lubrication but as its speed increases thereis conversion of boundary layer lubrication into
Film lubrication.
From zero speed to appx. 540 RPM there is nocontinuos film between rotor and bearings and
there is chance of rubbing between rotor and
Bearing. Therefore JOP is used to prevent the
contact between rotor and bearings.
At Above 540 RPM the JOP can be Switched off,
as film lubrication comes into picture.
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HYDROSTATIC LUBRICATION
In Hydrostatic type of
Lubrication the Rotor itself islifted by high external Lube oil
pressure generated by screw
pumps.