The issue of high vibration levels in the pump bearings.
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I would like to ask fellow sailors for their advice. Recently, we conducted a vibration inspection of all the pumps in the workshop. Using vibration meters, we found that some pumps had elevated vibration levels. In the case of certain hot water booster pumps, whose operating medium is hot water at around 85°C, the vibration level of the front bearings reached 7.8 mm/s, while the vibration speed of the rear bearings of some motors reached 3.0 mm/s. However, the vibration displacement was not high, remaining around 0.0 several mm. I would like to know whether the vibration levels of pumps are related to the medium being pumped For example, during operation, condensate pumps will more or less experience some cavitation, right? Will this lead to increased vibration in the pump? I know that the vibration values of mechanical pumps are based on **standards; could any member upload them so we can share them together? Thank you all for your help and answers!
Could it be that the temperature of the pumped medium has an impact? Beginner
The outlet pressure of a hot water pump is related to the hot water temperature and the inlet flow rate. If there is an issue with the selection, cavitation will occur, resulting in a \"pop\"ing sound. and causes pump vibration.
The vibration velocity of the front bearing reached 7.8 mm/s; according to ISO 10816, this requires the machine to be shut down for maintenance. The vibration acceleration of the motor’s rear bearing is 3.0 m/s, but the vibration displacement is very small. I guess your motor should have rolling bearings. For rolling bearings, displacement, or even velocity, does not hold much reference value; what is meaningful is acceleration. This value is still a bit high; it is recommended to pay close attention to it. Regarding the relationship between vibration levels and the pumping medium, my personal understanding is that under normal circumstances, if the selection is proper, there should be no issue. In other words, when selecting your pump, the properties of the medium should have been taken into account, such as temperature, vaporization pressure, inlet pressure, and friction losses along the flow path. However, if the operation or selection is improper, the medium will inevitably affect the vibration behavior. I don’t have any **standards here either; it is recommended to look for the relevant ISO 10816 standards online. **Standard, hehe