Please help analyze the cause of impeller damage
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Basic parameter model: CZ50-315 ； flow: 50m3/h ； Lift: 150m ； It vibrates a lot during operation, but there is no problem with the alignment. It is suddenly damaged during operation. Can anyone help analyze the cause?
Is it made of cast steel? It's so brittle. Check to see if it's caused by incorrect chemical composition or heat treatment. The blade seems to have been repaired welded.
There is no problem with the alignment, but the vibration is large. Maybe something fell inside, so the vibration was large and the impeller was damaged.
Look at the surface of the impeller. The conveyed medium should not be clear enough to see if there are solid particles. Check whether the filter at the inlet of the pump is damaged, which will cause solids to remain inside the impeller and increase the vibration.； There is no problem with the alignment. Has the impeller been repaired? Has it been dynamically balanced after repair? The impeller seems to have cracks and has been repaired, and there are pits caused by cavitation.
They are all damaged at the exit. Is there any hard foreign object? Eliminate cavitation
I didn't notice such a big foreign object during disassembly and inspection.
There shouldn't be one. I didn't see it when I opened it.