Analysis of the causes of abnormal noises during the operation of centrifugal compressors
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At 23:16:28 on August 25th, the shift supervisor in the office heard an abnormal noise coming from the centrifugal compressor in the octane unit; the noise lasted for a short period of time, about 2 seconds. After the noise occurred, it was observed through the DCS that the operating current dropped to 0 amps at 23:16:28, before returning to normal levels at 23:16:30. During this time, no abnormal changes were detected in the compressor’s operating parameters (shaft displacement, shaft vibration, speed, frequency) nor in the process parameters (inlet and outlet pressures). The electrician checked the power supply lines and found no issues with voltage fluctuations, and the control system records showed no signals indicating a shutdown. This phenomenon is similar to what happens when there is a change in the power supply. Could experts help analyze the causes of this abnormal situation?
Since it is driven by a motor, check whether the motor speed exceeds the generation speed. The motor is definitely an asynchronous motor; check whether there is short-term overspeed, such as exceeding 1500 or 3000. Reverse power. Of course, this is on the premise that you determine that the parameters of the mechanical components are normal. Mechanical problems can then be ruled out first.