I would like to ask about the reasons for high vibration in the pump’s end seal
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It is a multi-stage centrifugal pump, using butane as the medium. Initially, it was observed that the vibration of the mechanical seal was low during the day but increased at night. After several tests, it was found that the vibration decreased significantly when the temperature at the pump inlet rose above 50°C. What could be the reason for this?
We need to check the spectrum; it could be the expansion having an impact, or it could be the oil temperature.
Reply: 2# mirook’s explanation is very professional. I’m not from the equipment department and don’t have any instruments for measuring spectra – could you explain it in simpler terms?
If the vibration is within the acceptable limits, there’s no need to worry about it. It may be that the medium temperature affects pipe expansion, causing changes in the position or shape of the equipment. Is there a hose in the middle?
Reply to 4# mirook: The vibration level is excessive when the inlet temperature is low; it reaches 16 mm/s when vibration is high, and only 2 mm/s when vibration is low. There is no temperature control valve, so the temperature fluctuates frequently and is also greatly affected by ambient temperatures.
There is no hose in the middle; the mechanical seal is a dry gas seal, and there is a flushing solvent that is drawn back from the pump outlet
What instruments are generally used to measure the vibration of centrifugal compressors? Which data needs to be monitored? The teacher has taken on a project and asked me to find out what instruments are needed and what methods can be used to measure the vibration of compressors.