Corrosion of pump impeller
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When a centrifugal pump impeller suffers from corrosion, wear, or cavitation, which part of the impeller is affected first? (Is it the side of the impeller that is closer to the pump inlet or the side that is closer to the bearing housing?) Is it the part of the impeller near the mouth ring or the outer ring? ）
Corrosion occurs on all sides; wear takes place on the front side of the rotating part, while cavitation generally occurs on the back side.
In other words, wear occurs near the pump inlet of the impeller, while cavitation generally occurs on the back side of the impeller (the side facing the mechanical seal)?
Not necessarily; it depends on the surface of the impeller, specifically at that point. It seems there isn’t any
This post was last edited by hy_0619 on 2016-4-8 at 11:42. I can explain the issues mentioned above to you; cavitation in a pump starts first in the impeller channel at the suction inlet, on the side closest to the motor, that is, in an area near the inlet. Wear is generally uniform; it affects the outer surface of the impeller. Sometimes, when the wear is severe, it may also wear the inner surface of the pump cover.
The layer owner should refer to the working surface and the back surface of the blade
Corrosion should be relatively uniform; as for abrasion, I think it is concentrated on the outer side of the impeller, that is, in areas where the edge linear velocity is high and thus friction is greater； Cavitation damage typically occurs at the impeller inlet and on the low-pressure side cover. Note: It’s cavitation, not erosion: lol