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Gas turbine lube oil tank level cyclic fluctuation experienced in 2 units of GE Frame 7 gas turbine used as a driver for MCR and Propane compressors respectively.
Recently I noticed that the lube oil level is fluctuating and upon checking the historic trending, the fluctuations had started as early as 2005! As of 2013, we have had multiple shutdowns (MI, HGPI, CI) in between but unfortunately no investigation was done as nobody notices this problem until recently.
The lube oil tank level (measured by Rosemount transmitter using wet leg) of a GE FR7 is experiencing a cyclic level fluctuation of about 20%. Another similar unit of FR7 is also experiencing cyclic fluctuation of about 10%. It was confirmed that the sight glass level tallies with the transmitter measurement. The oil tank has a capacity of 14000 liters so 20% of level fluctuation is a lot of oil!
Both machine's lube oil tank level flucutations are very consistent, reached the high of 60% normally around early morning (1am - 7am) and gradually reduced to 40% normally around late afternoon (2pm-6pm). The cyclic period (from high peak to next high peak) is around 24 hours.
Really appreciate any suggestions/comments to help solve the problem. I will try to provide more information so please feel free to ask if there is any specific questions for better understanding of the problem.
Thank you!
Recently I noticed that the lube oil level is fluctuating and upon checking the historic trending, the fluctuations had started as early as 2005! As of 2013, we have had multiple shutdowns (MI, HGPI, CI) in between but unfortunately no investigation was done as nobody notices this problem until recently.
The lube oil tank level (measured by Rosemount transmitter using wet leg) of a GE FR7 is experiencing a cyclic level fluctuation of about 20%. Another similar unit of FR7 is also experiencing cyclic fluctuation of about 10%. It was confirmed that the sight glass level tallies with the transmitter measurement. The oil tank has a capacity of 14000 liters so 20% of level fluctuation is a lot of oil!
Both machine's lube oil tank level flucutations are very consistent, reached the high of 60% normally around early morning (1am - 7am) and gradually reduced to 40% normally around late afternoon (2pm-6pm). The cyclic period (from high peak to next high peak) is around 24 hours.
Really appreciate any suggestions/comments to help solve the problem. I will try to provide more information so please feel free to ask if there is any specific questions for better understanding of the problem.
Thank you!