Governing and safety system problems

1. Insensitive to changes in load, changes in leaps.

2. The oil servomotor cannot fully open or fully close in static testing.
3. Turbine speed wave or power, thermal load wave.
4. Extraction or back pressure cannot work.
5. Governing valve seal is not tight.
6. Governing valve rod is leakage.
7. Emergency governor pilot valve, axial movement limiting device, startup valve, emergency shut off and reset device cannot switch latch.
8. Additional security oil pressure and safe oil pressure not be established or low.
9. Emergency governor pilot valve and security box operation under low speed.

10. Oil ejection test is failed.

11. Turbine oil servomotor LVDT setting.
12. WoodWard505、505E、SPC、CPCⅡparameters configuration setting.
13. The pulse oil pressure (signal oil pressure) of hydraulic spring type oil servomotor cannot be established or under the design value.
14. Closing time of the oil servomotor is too long.
15. OPC function cannot be used.
16. Rotary slide valve cannot be rotated.
17. Unable to run at full capacity.
18. Turbine load shedding with a speed large rise.
19. Adjustment of speed regulating system.

Main Stop Valve (MSV)

1. MSV can’t be closed fully under hot condition.
2. MSV shut down automatically after it open to a certain extent.
3. MSV can’t be opened.
4. MSV can’t be opened in position.
5. Large leak of steam.
6. Automatic closing device cannot be tested activities.
7. Automatic closing device can’t be opened in position.
8. The closing time of MSV / automatic closing device is too long.

Oil System

1. The pressure of HP oil pump can’t reach to the setting value.
2. The outlet pressure/ inlet pressure of turbine main oil pump is low.
3. Turbine lubricating oil pressure is low.
4. The temperature of turbine return oil is too high.
5. The oil cooler outlet temperature is too high.
6. The lubricating oil pump outlet pressure is low.
7. Three-way check valve jam.
8. It does not match the HP oil pump output and system.
9. Oil return jam
10. Bearing pedestal oil leakage.