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sub vibration on turbo expander/compressor

sub vibration on turbo expander/compressor

(OP)
thread384-197619: Sub vibration Turbo Expander/compressor
Does anybody could help me with this problem? We have this same problem here in Brazil and we didn´t find the main cause. Does anybody found the solution or the cause of this sub vibration on turbo expander? Our sub is 0,22 X rpm and anplitude 0,2 mils. It is causing premature failure on the expander side bearings (tilting pad).

RE: sub vibration on turbo expander/compressor

Can you answer the questions that were asked in the referenced thread?

Mike Halloran
Pembroke Pines, FL, USA

RE: sub vibration on turbo expander/compressor

(OP)
The fluid is natural gas on expander side and residual gas on compressor side. We notice that the sub vibration appeared in 22000 rpm. The nominal speed is 35000 rpm. Inclusive addition to this we ask the unit operator to increase the gas temperature on expander side and the sub vanished but the unit efficience went down and with a little bit of process variation the sub come back. The data Sheet is attached.

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