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TURBINE LUB OIL SYSTEM
OF 200 MW
CONTENTS
WHY LUB OIL SYSTEM IS NECESSARY
COMPONENTS OF LUB OIL SYSTEM
FLOW DIAGRAM OF LUB OIL SYSTEM
FUNCTIONS OF INDIVIDUAL
COMPONENTS
OIL FLOW TO DIFFERENT BRANCHES
FIRE PROTECTIONS
CONTROL OIL
WHY LUB OIL IS NECESSARY
LUBRICATION : SUPPLIES OIL TO JOURNAL
BEARRINGS TO GIVE AN OIL WEDGE AS THE
SHAFT ROTATES
MAINTAINS THE TEMP OF BEARINGS
H2 COOLED GEN : SEALING MEDIUM TO
PREVENT H2 LEAKING OUT ALONG THE SHAFT
MEDIUM FOR HYDRAULCALLY OPERATING THE
GOVERNOR GEAR
DRIVING THE TURNING GEAR
JACKING UP THE SHAFT AT SLOW SPEED
COMPONENTS
AUXILLARY OIL PUMP
JACKING OIL PUMP
EMERGENCY OIL PUMP
MAIN OIL PUMP
EMERGENCY SHUT OFF OIL
MAIN OIL COOLERS
MOT CENTRIFUGE
MOT VAPOUR EXTRACTOR
LUB OIL SYSTEM
HP
OIL
COOLER
GEN
OIL TANK
SOST
IP LP
AUXILLARY OIL PUMP
AOP-Two in numbers
Specifications –
Capacity-78 L/S
Discharge pr-6.8 Ksc
Speed - 1480 rpm
Drive - A.C. Motor
Motor power-11 KW
Rated Current-53 Amp
During start up & shut down AOP supplies
the control oil. When turbine speed is less
than 2800 rpm it supplies oil to governing
system as well as lubrication system
SLC AOP
Command goes to switch ON AOP-1
when :
SLC AOP-1 IS ON and AOP-2 trips
OR
Oil pressure <4.8 ksc
 Command goes to switch ON AOP-2
When:
SLC AOP-2 IS ON and AOP-1 trips
OR
Oil pressure < 4.5 ksc
JACKING OIL PUMP
Use to lift the shaft during start up/shut
down
JOP- Two in numbers
Specifications-
Capacity- 1.26 L/S
Discharge pr- 120 ksc
Speed-2980 rpm
Drive-A.C .Motor
SLC JOP
 SLC JOP-1 ON
If speed < 510 rpm JOP-1 gets on command
If speed> 540 rpm JOP-1 gets off command
 SLC JOP-2 ON
If JOP-1 trips OR JOP pr<120 ksc
When speed <510 rpm with delay of 5 second
command goes to
ON JOP-2
OFF JOP-1
OFF SLC JOP-1
EMERGENCY OIL PUMP
Provided as back up protection
Cuts in whenever there is AC failure or the
power in the lubrication system falls less
than 1.1 Ksc
Specifications-
Capacity-30L/S
Discharge pr-2.3 ksc
Speed-1460 rpm
Drive-D.C Motor
Motor power-27.6 kw
SLC EOP
EOP ON Command goes when
SLC EOP is on
and
Lub oil pressure< 1.1 ksc
MAIN OIL PUMP
Pump mounted in front Brg pedestal
Coupled with turbine rotor through a coupling
When speed is more than 2800 rpm then desired
quality of oil goes to governing system(12 Ksc)
& to the lubricating oil system
Two injectors are arranged in series
Specifications-
Capacity- 139 L/S
Discharge pr-8.2 ksc
Speed -3000 rpm
Drive- Turbine
EMERGENCY SHUT OFF OIL
FUNCTION:
Shut off oil during emergency like
when oil catches fire , it saves the
equipment from further damage
Operated from local
LOCATION
MOT ROOM
NEAR MAIN OIL PUMP
EMERGENCY SHUT OFF OIL
I MOP
Lub oil header To lub
oil
cooler
filter
Gate valve
1
Gate valve 2
Shut off
Control
valve
drain Control oil
MAIN OIL COOLERS
 Purpose is to cool the oil , Water is inside
the tube and oil flows in outer shell
 Maximum lubricating oil temperature at
cooler outlet restricted to 47 deg
 Bearing metal temperature
alarm- 90 deg
shut down-120 deg
 Three way control valve
-Electrically driven & has the function of
regulating lubricating oil temperature
CENTRIFUGE
 Draws oil from turbine oil tank mainly DOT
, after removing any water & entrained
solid matter oil is returned back to oil tank
 Centrifuge does two functions:
o Clarification-Sludge seperation in which
the machine is used for seperating off
particles normally solid
o Purification-Liquid (oil)–Liquid (water)
separating two intermixed liquids which
are insoluable in each other & have
different sp gravities. Solids with sp gr
higher than those of liquid can be
seperated of at the same time
MOT VAPOUR EXTRACTOR
Mounted on top of main oil tank
Function is to produce slight negative
pressure in main oil tank and in the
bearing casing and thus draws off oil
vapour
Oil vapour before exhausting to atm
is passed through oil catcher
TURNING GEAR
Consist of two rows of moving blades
mounted on coupling between IP & LP
turbine
Oil supplied by AOP strikes against
hydraulic turbine blades & rotates the
shaft at 110 rpm
Provision for manual bearing in event of
failure of TG
SLC TURNING GEAR ON
Speed < 210 rpm opens TG
Speed > 240 rpm closes TG
OIL FLOW TO DIFFERENT
BRANCHES
MOP
AOP2
AOP1
) (
) (
Oil
cooler
EOP
Turnning
gear
Shut off
valve
Lube
oil
Thrust brg
CONTROL OIL
CONTROL OIL
Control oil is used in governing
System
Control oil generates several oil like
Trip oil : stop v/v , sec oil ckt
Aux trip oil :turbine protn device
Start up oil : Resetting stop v/v
Aux start up oil :Resetting
. protection devices

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84113887-Turbine-Lub-Oil-System.ppt

  • 1. TURBINE LUB OIL SYSTEM OF 200 MW
  • 2. CONTENTS WHY LUB OIL SYSTEM IS NECESSARY COMPONENTS OF LUB OIL SYSTEM FLOW DIAGRAM OF LUB OIL SYSTEM FUNCTIONS OF INDIVIDUAL COMPONENTS OIL FLOW TO DIFFERENT BRANCHES FIRE PROTECTIONS CONTROL OIL
  • 3. WHY LUB OIL IS NECESSARY LUBRICATION : SUPPLIES OIL TO JOURNAL BEARRINGS TO GIVE AN OIL WEDGE AS THE SHAFT ROTATES MAINTAINS THE TEMP OF BEARINGS H2 COOLED GEN : SEALING MEDIUM TO PREVENT H2 LEAKING OUT ALONG THE SHAFT MEDIUM FOR HYDRAULCALLY OPERATING THE GOVERNOR GEAR DRIVING THE TURNING GEAR JACKING UP THE SHAFT AT SLOW SPEED
  • 4. COMPONENTS AUXILLARY OIL PUMP JACKING OIL PUMP EMERGENCY OIL PUMP MAIN OIL PUMP EMERGENCY SHUT OFF OIL MAIN OIL COOLERS MOT CENTRIFUGE MOT VAPOUR EXTRACTOR
  • 6. AUXILLARY OIL PUMP AOP-Two in numbers Specifications – Capacity-78 L/S Discharge pr-6.8 Ksc Speed - 1480 rpm Drive - A.C. Motor Motor power-11 KW Rated Current-53 Amp During start up & shut down AOP supplies the control oil. When turbine speed is less than 2800 rpm it supplies oil to governing system as well as lubrication system
  • 7. SLC AOP Command goes to switch ON AOP-1 when : SLC AOP-1 IS ON and AOP-2 trips OR Oil pressure <4.8 ksc  Command goes to switch ON AOP-2 When: SLC AOP-2 IS ON and AOP-1 trips OR Oil pressure < 4.5 ksc
  • 8. JACKING OIL PUMP Use to lift the shaft during start up/shut down JOP- Two in numbers Specifications- Capacity- 1.26 L/S Discharge pr- 120 ksc Speed-2980 rpm Drive-A.C .Motor
  • 9. SLC JOP  SLC JOP-1 ON If speed < 510 rpm JOP-1 gets on command If speed> 540 rpm JOP-1 gets off command  SLC JOP-2 ON If JOP-1 trips OR JOP pr<120 ksc When speed <510 rpm with delay of 5 second command goes to ON JOP-2 OFF JOP-1 OFF SLC JOP-1
  • 10. EMERGENCY OIL PUMP Provided as back up protection Cuts in whenever there is AC failure or the power in the lubrication system falls less than 1.1 Ksc Specifications- Capacity-30L/S Discharge pr-2.3 ksc Speed-1460 rpm Drive-D.C Motor Motor power-27.6 kw
  • 11. SLC EOP EOP ON Command goes when SLC EOP is on and Lub oil pressure< 1.1 ksc
  • 12. MAIN OIL PUMP Pump mounted in front Brg pedestal Coupled with turbine rotor through a coupling When speed is more than 2800 rpm then desired quality of oil goes to governing system(12 Ksc) & to the lubricating oil system Two injectors are arranged in series Specifications- Capacity- 139 L/S Discharge pr-8.2 ksc Speed -3000 rpm Drive- Turbine
  • 13. EMERGENCY SHUT OFF OIL FUNCTION: Shut off oil during emergency like when oil catches fire , it saves the equipment from further damage Operated from local LOCATION MOT ROOM NEAR MAIN OIL PUMP
  • 14. EMERGENCY SHUT OFF OIL I MOP Lub oil header To lub oil cooler filter Gate valve 1 Gate valve 2 Shut off Control valve drain Control oil
  • 15. MAIN OIL COOLERS  Purpose is to cool the oil , Water is inside the tube and oil flows in outer shell  Maximum lubricating oil temperature at cooler outlet restricted to 47 deg  Bearing metal temperature alarm- 90 deg shut down-120 deg  Three way control valve -Electrically driven & has the function of regulating lubricating oil temperature
  • 16. CENTRIFUGE  Draws oil from turbine oil tank mainly DOT , after removing any water & entrained solid matter oil is returned back to oil tank  Centrifuge does two functions: o Clarification-Sludge seperation in which the machine is used for seperating off particles normally solid o Purification-Liquid (oil)–Liquid (water) separating two intermixed liquids which are insoluable in each other & have different sp gravities. Solids with sp gr higher than those of liquid can be seperated of at the same time
  • 17. MOT VAPOUR EXTRACTOR Mounted on top of main oil tank Function is to produce slight negative pressure in main oil tank and in the bearing casing and thus draws off oil vapour Oil vapour before exhausting to atm is passed through oil catcher
  • 18. TURNING GEAR Consist of two rows of moving blades mounted on coupling between IP & LP turbine Oil supplied by AOP strikes against hydraulic turbine blades & rotates the shaft at 110 rpm Provision for manual bearing in event of failure of TG SLC TURNING GEAR ON Speed < 210 rpm opens TG Speed > 240 rpm closes TG
  • 19. OIL FLOW TO DIFFERENT BRANCHES MOP AOP2 AOP1 ) ( ) ( Oil cooler EOP Turnning gear Shut off valve Lube oil Thrust brg
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  • 25. CONTROL OIL Control oil is used in governing System Control oil generates several oil like Trip oil : stop v/v , sec oil ckt Aux trip oil :turbine protn device Start up oil : Resetting stop v/v Aux start up oil :Resetting . protection devices