Sub vibration Turbo Expander/compressor
Sub vibration Turbo Expander/compressor
(OP)
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 viscoity is acceptable and steady. Also the bearing temperatures are fine. The overall vibration leves on the expander are approx 20 um pp.
Anybody knows whats causing the sub vibrations?
I do not thik its caused by oil whirl since the viscoity is acceptable and steady. Also the bearing temperatures are fine. The overall vibration leves on the expander are approx 20 um pp.
Anybody knows whats causing the sub vibrations?





RE: Sub vibration Turbo Expander/compressor
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Dave G.
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RE: Sub vibration Turbo Expander/compressor
RE: Sub vibration Turbo Expander/compressor
What is the fluid? Is this a cryogenic service? Can you get data as a function of load or speed? What is the speed?
20 micron on the high speed expanders I have messed with would be considered pretty high vibration.
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RE: Sub vibration Turbo Expander/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 before going though both compressors.
Running speed is approx 11000 rpm
RE: Sub vibration Turbo Expander/compressor