The shaft configuration is "warm" turbo expander --> copling --> compressor.
The gas runs through two of these machine trains.
The system like this: Dry natural "raw" gas goes through expander 1, enters a separator and a heater. Separates again, then through expander 2. Then separates again...
I have just started to monitor a Turbo Expander/compressor and discovered sub vibrations on the expander side. The sub vibrations does not vary with load, varies between 0.1 to 0.65 x rpm. Sometimes the amplitude is grater than 100% of 1 x rpm
I do not thik its caused by oil whirl since the...
