Vibration problems in centrifugal compressors – seeking expert guidance for analysis
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There is a centrifugal compressor, with an acceleration gearbox and an inverter-driven motor. The medium is a triamine process mixture. After this maintenance, when the speed reached 1500 revolutions per minute, the vibration at the non-drive end was 60-70 um, while it was 25-30 um at the drive end. At 2600 revolutions per minute, the driven case is around 20, and the undriven one is also around 20. What is the reason for this? I seek guidance.
Is the bearing shell clearance too large? Or when installing the high-speed shaft. It wasn’t installed properly.
You have provided too little information. First of all, what is the cleanliness level of the gas medium? Is it corrosive to the equipment, and does it cause scaling? Is it operating within the process requirements? Does the generation of vibration stem from process-related factors or mechanical factors? Each of these aspects should be verified step by step.
The temperature at points with high vibration must be very low; the clearance between the bearing shells is too large
Is 1500 a critical rotational speed range?
Vibration range? At a certain frequency, shaft vibration increases and noise levels rise; try avoiding that frequency. Generally, the range of frequencies is not very wide – there are just a few frequencies involved
A previous Piile wind turbine had the same issue: at frequencies around 32-35, vibration increased, current levels rose, and noise level increased. After that, we avoided operating the compressor within that frequency range, and everything worked normally once we stayed outside that frequency range