A newcomer is asking about the reasons for the pit-like defects in the impeller of a centrifugal pump
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The medium transported by this pump is a magnesium sulfate solution with a concentration of 30% to 40%, and the maximum flow rate is approximately 4 m3/h; the specific details are shown in the figure. I’d like to ask the experts what causes these issues! Thank you!
It must be a material issue. Normally, titanium should not behave this way in this medium. The color is wrong too.
The alloy analyzer confirmed that it is indeed titanium material; cavitation is suspected to be the cause, but no reason can be found for such voids to appear on the sides and back of the impeller.
If it is a casting defect, stability during operation should be poor and the bearings should wear out easily, but so far there are no abnormalities with the bearings.
I would like to ask: where does cavitation mainly occur? Why do the sides and back of the impeller have such a significant impact, while the actual flow surface only shows phenomena similar to pitting?