05 lube oil system. in gas turbine systemsppt

Lube oil analysis

1. THE TURBINE LUBRICATING
OIL SYSTEM

2. Oil Properties etc
• What are the properties of oil?
• Why do we use it?
• LUBRICATION OF MOVING PARTS,HELPS
REDUCE FRICTION AND THEREFORE
PROLONGS COMPONENT LIFE.
• ABSORBES HEAT AND THEREFORE ASSISTS
COOLING BEARING AREAS.

3. General Oil Specification
LUBE OIL SYSTEM
- SYSTEM DESIGNED TO OPERATE ON ISO VG 46
MINERAL OIL
- ISO VG 68 CAN BE USED IN AREAS WHERE HIGH AMBIENT AIR
TEMPERATURE CAN BE EXPECTED
- ISO VG 32 IN COLD AREAS
SIEMENS APPROVAL MUST BE SOUGHT TO CHANGE FROM VG 46
IT IS ADVISED TO STICK TO ONE MANUFACTURER FOR OIL
REPLENISHMENT - DO NOT MIX SUPPLIERS
DO NOT CONTAMINATE THE OIL WITH SILICONE OR ANY OTHER
SUBSTANCE.
OIL MUST BE SAMPLED AND TESTED REGULARLY FROM A FLOW POINT.

4. TYPICAL BEARING ARRANGEMENT

5. JOURNAL AND THRUST BRG ASSEMBLY

8. TYPICAL GEARBOX DRIVEN MAIN LUB
PUMP

9. LUB OIL EQUIPMENT LAYOUT
PRESSURE REGULATOR
THERMOSTATIC
DIVERTER VALVES
LUB OIL
FILTERS
DC EMERGENCY LUB
OIL PUMP/MOTOR
AC AUXILLARY LUB
OIL PUMP/MOTOR

11. Differential Pressure Indication
DIFFERENTIAL PRESSURE INDICATORS FITTED TO ALL FILTERS
GREEN IS O K
BUT WATCH OUT FOR THE RED!
REMEMBER INDICATORS DO NOT WORK PUMPS STATIONARY

12. SGT 100 Thermostatic Valves.
THERMOSTATIC VALVE ASSEMBLY

13. HOT OIL
FROM THE TANK
COLD OIL
FROM THE COOLER
START
AMOT - Thermatic Control Valve.
(OPERATION)
OIL TO THE ENGINE

14. HOT OIL
FROM THE TANK
COLD OIL
FROM THE COOLER
RUNNING
AMOT - Thermatic Control Valve.
(OPERATION)
COOLED OIL TO THE ENGINE

15. OIL
COOLER
Thermostatic
Valve
Hot Oil From Tank
Oil Delivery
To Turbine
Valve is Closed
& Oil flows
directly to
Turbine
Below 41 deg C
AMOT - Thermatic Control Valve. (OPERATION)

16. OIL
COOLER
Thermostatic
Valve
Hot Oil From Tank
Oil Delivery
To Turbine
Valve now Open
& Oil flows
through the
cooler & then to
the Turbine.
49 deg C
AMOT - Thermatic Control Valve. (OPERATION)

17. The AC Pump will be activated by:-
•Turbine start
•Switched on by bearing within 40 DegC of
alarm point (100 DegC WNG 125 DegC SDN for all
journal & thrust bearings).
•Turbine average temp above “85DegC”.
•Shaft Rotation.
•Manual Switch on MCC.

18. DC-AC-Main Oil Pump Start Sequence
TIME
PRESSURE
PSI
30
25
APPROX
9000 rpm
AC PUMP MAIN PUMP
START
20
Max 30 sec Max 15 sec
DC PUMP
ROTATION

19. Gas Leak Shutdown Sequence
TIME
PRESSURE
PSI
30
25
20
20% LEL
SHUTDOWN
10% LEL
ALARM
DC LUB PUMP
ON
MAIN PUMP
PRESSURE
APPROX 3 hrs (site specific)

20. Main Oil Pump Failure Sequence
PRESSURE
PSI
30
25
20
SHUTDOWNALARM AC FAILURE
DC PUMP
MAIN PUMP
14.7
AC PUMP
TIME

21. LUB OIL RUNNING CONDITION

22. D.C. EMERGENCY LUB OIL CONDITION

23. DC Pump Circuit
What switches it
on?
Start Sequence.
Fire.
Gas Leak.
AC power failure) .(ie if demanded)
AC oil pressure failure.
TCM Switch

24. PRE and POST LUBRICATION

25. Seal Air Failure
POST SHUTDOWN + RUNDOWN , IF PT 172 DETECTS A LOSS OF SEAL
AIR PRESSURE
THE AC PUMP WILL BE INHIBITED - to reduce
leakage
THE DC PUMP WILL RUN - to protect the Bearings
and Vibration Probes.
IF THE BEARING TEMPS REACH 140 deg C. THE AC PUMP INHIBIT
WILL BE REMOVED AND THE PUMP WILL RUN UNTIL THE
BEARING TEMP HAS DROPPED BELOW 125 deg C FOR 10 mins.