The magnetic pump is noisy
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After replacing the graphite bushing in the magnetic pump, its operating noise is louder compared to before the replacement; however, the vibration and temperature are normal. It sounds like the noise is coming from the motor, with no signs of jamming or friction. I wonder if anyone knows the reason for this. Please advise!
Just replace the shaft sleeve? Has the pump shaft been replaced? Simply replacing the shaft sleeve usually isn’t sufficient; graphite shaft sleeves are soft, which is an advantage as they can allow the pump to run idle for short periods, but the downside is that they tend to disintegrate and are not resistant to corrosion by certain strong acidic liquids. The bushing is made of graphite, while the pump shaft should be of ceramic material, as ceramic surfaces are quite smooth. If the noise level is high when you operate it, it indicates that the graphite bushing is wearing out. Magnetic pumps generally do not experience wear during normal operation (wear occurs only during startup). So, as you said, it’s possible that the shaft sleeve is not suitable or that the pump’s dynamic balance is not proper, which causes the magnet inside the pump to move around during operation and results in frictional noise.