The water pump only vibrates radially
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The water pump has been experiencing severe radial vibration recently, reaching 100. The motor is fine; the water pump bearings have been replaced, the impeller is made of 304 stainless steel, and the coupling has also been replaced. Please help, experts! ! !
Check whether the anchor bolts are loose!
Check if there are any issues with the coupling alignment; use a dial gauge to obtain data, and then measure the axial play
Is the whole unit vibrating, or is it just the pump shaft that vibrates heavily? If the shaft vibration increases due to overall vibration, it is caused by resonance. If it is only the shaft vibration that is high, then the pump body needs to be disassembled for maintenance.
Generally, if the radial vibration is high, it could be due to loose anchor bolts, cracks in the foundation, insufficient stability of the foundation, inadequate strength of the pump’s supports, or problems with the bearings； Judging from your picture, the channel steel of the pump’s base is small and weak, meaning its strength is insufficient ； The base of the pump is also relatively small; the pump head sticks out far above the base
There are many reasons for pump vibration. I’d like to add one more point: check whether the liquid level at the inlet is too low, as cavitation can also cause high vibration levels
This post was last edited by 123B123 on 2017-11-23 at 13:53. There’s nothing more to say – the piping design is incorrect; there isn’t a proper straight section for flow stabilization between the valve on the pump’s suction pipe and the inlet, as required by the standards. When the pump flow rate reaches a certain level, the deflected fluid impacts the pump impeller and pump shaft, resulting in surging. This causes the pump impeller and pump shaft to vibrate at high frequencies and with large amplitudes, which in turn leads to vibration of the entire pump body. It may cause damage to the pump shaft and impeller. Simply strengthening the pump’s foot bolts is not sufficient. Modifying the piping design of the pump’s connection pipes can resolve the problem fundamentally. Refer to the specification: Zhang Dejiang’s