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hello,
we have 02 critical speed (turbomachine category 4), in the transitional phase between start speed (0 rpm/min or rotor bearing speed), and permanent phase (3000 rpm) ,at :
1- Approx 1000 rpm/min +/- 100 rpm/min
2- Approx 2000 rpm/min +/- 100 rpm/min
NB: 50HZ + absolute vibration
Kind regards.
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