Centrifugal compressor
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The shaft vibration of the level 5 centrifugal compressor has suddenly increased, being about 30μm higher than the normal level. Due to operational conditions, it is not possible to shut down the compressor for inspection. Checks of the instruments on site showed no problems, and the compressor’s casing also appeared to be in good condition; there were no abnormalities in the operating conditions. Please help analyze this situation
These types of problems are very complex; based on the on-site conditions, it is necessary to determine whether the actual vibration is increasing. For example, through instrument measurements and tactile sensing, it can be confirmed that the vibration is indeed increasing. In the face of such problems, once everything that can be done without shutting down the system has been taken care of, it is necessary to monitor and keep it running. Once the allowable limit is reached, the machine must be shut down for maintenance. Possible causes of vibration include scale accumulation on the rotor, which leads to an imbalance in dynamic balance, as well as excessive wear and clearance in the bearings. Also, the gas phase of each intercooler needs to be checked for water drainage. There’s no good solution. During the process of maintaining operations, it is very important to report the situation to superiors as early as possible. For reference.
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There are likely debris on the impeller; it’s possible that some dust attached to it has fallen off, causing imbalance. It’s necessary to disassemble it and check carefully!
Sudden vibrations can be difficult to diagnose; if they do not reach the threshold values for alarm, it is necessary to continue monitoring. 1. One can start by examining the historical trends – by retrieving data on the compressor’s inlet and outlet pressures, temperatures, flow rates, as well as shaft bearing vibrations, and plotting them on a trend chart to observe how other parameters change at the point of the sudden vibration. 2. To troubleshoot the signal, you can connect the probe to a spare module and check. 3. Continue to monitor closely, paying attention to the return of lubricating oil and temperature changes. These are the things that come to mind for now
View changes in load and compression ratio for each section