Study on noise and vibration issues in the inlet pipeline of mechanical pumps
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I would like to ask the experts here: Our company has three circulating water pumps arranged in a two-main-one-redundant configuration. When each pump operates alone, there are no issues with vibration, but there is considerable noise and vibration at the inlet of the pipelines； Especially when two units are operated simultaneously, the vertical vibration at the drive ends fluctuates between 3.0–5.8 mm/s, and neither the noise nor the vibration is eliminated. I would like to ask what causes this and how it should be resolved? Thank you
First, check the process parameters to see if the inlet flow rate and temperature match those specified when the pump was selected. If there are significant changes, it can affect the pump’s performance; could cavitation occur as a result? Also, check whether the pipeline configuration is reasonable and whether vortices could occur Is it necessary to add support? These are all methods for eliminating problems
First, it is possible that resonance is at play; also, it needs to be checked whether the inlet pipeline is too small, and whether there are vortices at the inlet that allow air to enter.
Loosen the flange connection between the pump inlet pipeline and the pump to check for any stress. If there are no problems, check the fixation of the pipeline and see if the fixing piers at the inlet are secure.