Lub Oil System 1

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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.

Lub Oil System 1

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