Oil Leakage from Turbine Governor

[atheistrical]

I am looking for feedback into the possible causes of oil leakage from a turbine governor that controls a pelton turbine. The following is an abstract of the issue.

1. Governor Make : Ganz Mavag, Budapest
2. Model : 1979
3. Present Status : Oil Leaks from within the Governor Shaft Assembly, although the exact location is unknown/hidden
4. Clauses : Oil leaks only when the generator generates low power; when a 6.3 MW generator runs at 0.9 MW load. If the load is increased i.e. the generator starts generating power more than say 2 MW, the oil leakage from the governor assembly stops.

5. What I figured out!

I thought that the most probable cause would be the wearing away of the main governor shaft at one of the ends. Since this shaft is driven by oil hydraulic, and since the oil is held by two rubber gaskets at both ends of the shaft; as the shaft moves to an extreme position, the oil at high pressure squirts out from the worn out periphery of the governor shaft at the gasket.

What are your viewpoints?

 

[Achy47]

Thank you for bringing up this issue regarding oil leakage from a turbine governor. I would like to share my thoughts and feedback on the possible causes of this problem.

Based on the information provided, it seems that the oil leakage is occurring only when the generator is operating at low power, and stops when the power output is increased. This suggests that the issue may be related to the governor's performance at lower speeds or loads.

One possible cause could be the wear and tear of the main governor shaft, as you have suggested. This could result in the oil leaking out from the gaskets at the ends of the shaft. However, it is important to also consider other factors that may contribute to this wear, such as the quality of the oil being used, the maintenance schedule, and the operating conditions of the turbine.

Another potential cause could be a malfunctioning or damaged gasket at one of the ends of the shaft. This could lead to the oil escaping from the assembly when the governor is in operation. It would be worth checking the condition of the gaskets and replacing them if necessary.

Furthermore, it is important to consider the possibility of any internal damage or defects within the governor shaft assembly itself. This could be causing the oil to leak out when the governor is operating at lower speeds or loads. I would suggest conducting a thorough inspection of the assembly to identify any potential issues.

In addition, it would be beneficial to analyze the oil that is leaking from the governor shaft. This can provide valuable insights into the condition of the turbine and help identify any potential contaminants or impurities that may be contributing to the oil leakage.

Overall, I believe that a combination of factors could be causing the oil leakage from the governor shaft assembly. It would be helpful to conduct a detailed investigation to identify the root cause and address it effectively. I hope my viewpoints and suggestions are helpful in resolving this issue.