Post on 05-Apr-2018
7/31/2019 Lub Oil System
1/20
May 24, 2012 PMI Revision 00 1
7/31/2019 Lub Oil System
2/20
May 24, 2012 PMI Revision 00 2
Purpose of lubrication system.
Components of lubrication system.
Lub Oil circuit
Specification of oil
7/31/2019 Lub Oil System
3/20
May 24, 2012 PMI Revision 00 3
Importance of the lubrication system
To reduce the wear and tear of the rotating elements.
To maintain the temperature of the bearings.
7/31/2019 Lub Oil System
4/20
May 24, 2012 PMI Revision 00 4
Purpose of Turbine oil system
Lubrication of turbine.
Cooling of bearings
Sealing medium in Hydrogen cooling system
Turbine barring gear operation.
Working fluid in Governing system
7/31/2019 Lub Oil System
5/20
May 24, 2012 PMI Revision 00 5
Main oil Pump.
Auxiliary oil pump
Emergency oil pump
Jack oil pump
Main Oil Tank
7/31/2019 Lub Oil System
6/20
May 24, 2012 PMI Revision 00 6
Oil coolers
Oil Filters
Oil Injectors
Centrifuge
Vapour Extractors
7/31/2019 Lub Oil System
7/20
May 24, 2012 PMI Revision 00 7
Injector
IPT LPTHPTGen
MOP
JOP
Oil cooler
Filter
AOP
EOP
MOT
Vap. Ext
7/31/2019 Lub Oil System
8/20
May 24, 2012 PMI Revision 00 8
7/31/2019 Lub Oil System
9/20
May 24, 2012 PMI Revision 00 9
In case of AC failure ( Black out ).
EOP will startExtend the DG supply to the emergency MCCStart AOPStart JOP.
Rotate turbine with Barring gear.
7/31/2019 Lub Oil System
10/20
May 24, 2012 PMI Revision 00 10
Specific Gravity 0.852 @ 50 0C Kinematic Viscosity 28 cs
Flash point 2010
C (Min)Pour Point - 6.6 0C (Max)Mechanical Impurities Nil
The recommended turbine oil Servo prime-46 of IOC.
7/31/2019 Lub Oil System
11/20
May 24, 2012 PMI Revision 00 11
MAIN OIL PUMP(MOP)
LOCATION: This pump is mounted in the front bearingpedestal. It is coupled with turbine rotor through a gear
coupling.
Oil suction from MOT Through two number of injectors
connected in series.
Takes over when turbine speed > 2800 rpm.
Supplies oil for turbine bearing lubrication as well as for
the turbine governing system. .
7/31/2019 Lub Oil System
12/20
May 24, 2012 PMI Revision 00 12
7/31/2019 Lub Oil System
13/20
May 24, 2012 PMI Revision 00 13
AUXILIARY OIL PUMPS(AOPS)
Two in number, AC motor driven Vertical one stage rotory pump with radial impeller & spiral casing.
Supplies oil during turbo-set starting and stopping when the turbine
is running at speed lower than 2800 rpm supplies oil to governing
system as well as to the lubrication system. It also serves as standby to main centrifugal oil pump.
Submerged pump body
7/31/2019 Lub Oil System
14/20
May 24, 2012 PMI Revision 00 14
EMERGENCY OIL PUMP(EOP)
This is a centrifugal pump, driven by D.C. electric motor.
Vertical
Centrifugal submerged
This automatically cuts in when ever there is failure of A.C. supply
at power station and or the lub oil pressure falls below a certain
value. This pump can meet the lubrication system requirement
under the conditions mentioned above.
7/31/2019 Lub Oil System
15/20
May 24, 2012 PMI Revision 00 15
JACKING OIL PUMPS(JOPS)
JOP1 & JOP2 Both pumps are AC driven but in some of the plants one
of the JOP is DC driven also.
To lift the rotor assembly during TG start up and shut
down.
Suction from MOT.
delivers a pressure of 120kg/cm2 for lifting of rotor.
7/31/2019 Lub Oil System
16/20
May 24, 2012 PMI Revision 00 16
OIL COOLERS
To cool the lubricating oil
Consists of tube nest, inner & outer shell & water boxes
The cooling medium for these coolers is circulating water.
The pressure of the cooling water is kept lower than that of oil toavoid its mixing with oil in the event of tube rupture.
OIL TEMP. CONTROLLER for maintaining the lub oil temp atrated value by controlling the flow through the coolers.
7/31/2019 Lub Oil System
17/20
May 24, 2012 PMI Revision 00 17
VAPOUR EXTRACTION SYSTEM
Two Vapour Extractor fans
Exhaust fans
Maintains -ve pressure inside MOT Removes oil fumes from the MOT.
7/31/2019 Lub Oil System
18/20
May 24, 2012 PMI Revision 00 18
OIL Filter
Basket type filter inside the oil tank
For thrust bearing
Duplex filter Filter changeover required after choking.
7/31/2019 Lub Oil System
19/20
May 24, 2012 PMI Revision 00 19
Main Oil Centrifuge
Required for removing moisture from the turbine oil.
A portion of oil is continuously circulated through the centrifuge to
remove the moisture from the oil.
7/31/2019 Lub Oil System
20/20
May 24, 2012 PMI Revision 00 20