The vibration of the centrifugal compressor suddenly rose to the trip level; experts, please help analyze the cause
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Experts, in Figure 1, the green line represents the situation where the vibration at measurement point 09 suddenly rose to its full scale, causing the system to shut down. Upon checking the historical data, there were no abnormalities in terms of speed, displacement, pressure, bearing temperature, or oil temperature at that time. It is preliminarily judged to be an instrument interference, so the interlocked hot start was randomly disabled. Figure 2 shows that after replacing the preamplifier at measurement point 09, there were significant fluctuations again at both measurement points 09 and 10. The same speed, pressure, bearing temperature, and oil temperature are all normal. Please, experts, give it some analysis
It is recommended to definitely check the solutions. The heat generated by the bearing bush is directly carried away by the lubricating oil, so no temperature changes occur. The vibration value is very crucial. It’s better to check the solution to avoid causing damage or accidents. For reference.
It is recommended to replace the vibration transmitter with an integrated one, as these have stronger resistance to interference and do not suffer from the kinds of disturbances you mentioned. Split-type transmitters indeed have many problems; there are numerous components involved, which is a common issue with instruments. Sometimes strange problems arise, and issues with the wiring can also occur. I’m not sure what principle your vibration sensor operates on – is it magnetoresistive? Magnetoelectric? First, figure out the principle
Where is the vibration probe installed? What principle does it operate on?
Are 09 and 10 measuring the same point? Were walkie-talkies used around the measurement points?
09 and 10 are the two probes corresponding to X\Y; the probes use Bentley 8mm probes
09 and 10 are the two probes corresponding to X\Y; the probes use Bentley 8mm probes； Checking the surveillance footage on site showed no one present
What position on the compressor is this measurement point located at? What is the situation with other vibration measurement points at the same time? It is necessary to first determine whether it is actual vibration or a false signal
Try cleaning the oxidation or oil on the connection terminals, and most importantly, check the grounding of the instrument and the connection box
Is the compressor’s speed fixed or adjustable? If it is adjustable, it can operate at a lower speed; check whether the vibration levels at the two vibration points are also higher accordingly； Also, is the return oil temperature at the points with higher vibration higher than that at other points? To analyze the reasons, basic information with a comprehensive set of equipment is required for further analysis.