Discussion on Compressor Vibration Analysis
Thread Content
Dear colleagues, our company has a centrifugal compressor with two vibration measurement points at the coupling end. After the first shutdown and subsequent restart, the vibration levels at these two points changed; the X and Y measurement points showed shifts, with one of the vibration points continuing to increase in value. However, all other operating parameters of the unit remained unchanged. A portable vibration meter was also used to measure the vibration velocity of the casing, which was 1.0 mm/s. In this situation, please discuss what possible causes there might be; could it be a problem with the instrument probe? ? Or interference?
The information you provided is too little; it is far from sufficient for fault diagnosis. In my opinion, having a sufficient understanding of the equipment itself and the operational procedures, along with consistent data collection over time, is of great help in assessing the operating condition of a piece of equipment
Indeed, too little information is provided! First, what does “starting up again after a pause” mean? Start it up again after maintenance? Or did it stop suddenly while still running, and then it was started up again without disassembling it or checking the sensors and instruments? ? !
Thank you. It was started up without any maintenance work after the unit was shut down a month ago
Yes, it just started running again a few days after stopping due to other issues with the device one month ago, without any maintenance or repairs being done
What is the medium used in this compressor? Are there any corrosive or abrasive substances such as coke dust? It hasn’t been used for a month – could it be that due to a lack of maintenance over time, things like the internal wires in the dashboard have been damaged? I’m sorry, there isn’t enough information; I really can’t think of any possibilities. Does your unit have a vibration interlock? ? Can’t the instruments be used to check things like the junction boxes online?
It’s just a simple air centrifugal compressor; it experienced a power outage that lasted two days just a month ago
Your issue isn’t a mechanical one; you can check the probe as well as whether there is any interference from the signal source! Take a look at the probe holder
Check how the other parameters change, and consider as a whole whether it is due to the local device or the instrument.
It is possible to contact the instrumentation staff to verify the accuracy of the probe data. If the probe measurements are accurate and the vibration levels are within the specified limits, there is no need for excessive concern. Large machinery that is shut down for extended periods should be inspected as required; remaining in one position for a long time can lead to bending, and changes in stress conditions can also affect vibration levels.