Is it cavitation?
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There is only a photo of the centrifugal pump cover. The pump impeller was not found.
Although double-suction circulating water pumps are very prone to cavitation, it usually occurs on the impeller. From the photo, the surface looks like erosion, while the cavitation on the impeller is honeycomb-shaped.
Find a theoretical explanation. For reference only.
Abrasion is more likely. It may be that ash residue accumulates on the edge of the gap in the wear ring and continues to wear. 1. There are no cavitation marks in the low-pressure area. 2. Cavitation damage is generally honeycomb, tofu-like, and matte surfaces. 3. Abrasion is generally caused by uneven erosion marks and fish-scale uniform damage over a large area.
This post was last posted by 3983596_Edited by FPPZ on 2021-12-15 07:42 Material defects account for 30%, cavitation accounts for 40%, corrosion accounts for 20%, and erosion accounts for 10% (estimated)
What information is this? Can you give me a copy? Thanks
Corrosion should be corroded in every position, and at most the degree of corrosion is different. It should be mainly caused by cavitation
Personally, I think that the honeycomb-shaped pits caused by cavitation should be concentrated in the position of the pump casing and the impeller outlet and distributed in a ring. I agree with the friend upstairs who said the possibility of abrasion.
If abrasion and cavitation are different from pure corrosion, how do you explain that there are no traces of cavitation on the suction side with lower pressure, but there is such a neat circle of cavitation on the side with high pressure?
Find a photo of an impeller experiencing cavitation. circle indication