Unusual cavitation on impeller outer diameter tip
Unusual cavitation on impeller outer diameter tip
(OP)
We have got a failure of a Sundyne pump model LMV-331. It had an unusual pattern that we have never seen before. Cavitation damage is evident on the impeller tip. The pump had been running for about 3 days since the start-up of the unit. The pump tripped off on high vibration and mechanical touch.
How did you resolve the cavitation problem? Why may this failure happen?
Has anyone else experienced similar cavitation as I have described?
I am pleasure if someone explain physical reasons of this failure (tip vortex cavitation).
M. Balaj
How did you resolve the cavitation problem? Why may this failure happen?
Has anyone else experienced similar cavitation as I have described?
I am pleasure if someone explain physical reasons of this failure (tip vortex cavitation).
M. Balaj





RE: Unusual cavitation on impeller outer diameter tip
The last example where I saw this damage was in a de-superheater pump in one of our cokers. They inject hot condensate to de-superheat steam. The condensate quill plugged off and they were not getting flow. Our cavitation damage was on the front of the vanes very close to the tip.
Johnny Pellin
RE: Unusual cavitation on impeller outer diameter tip
Johnny Pellin
RE: Unusual cavitation on impeller outer diameter tip
RE: Unusual cavitation on impeller outer diameter tip
what is your suggestion to over come this problem (cavitation problem at tip vanes)? does it solve by considering the minimum flow line?
RE: Unusual cavitation on impeller outer diameter tip
RE: Unusual cavitation on impeller outer diameter tip
Rasoul1250: The pump has an inducer. But the cavitation damage is not seen for this part.It is noticeable that the pump had been running for about 3 days.
M.Balaj
RE: Unusual cavitation on impeller outer diameter tip
The manufacturer may claim that you can run this pump down below 20 percent of BEP. But, look at the test curves, they probably don't show values below 40 percent of BEP. I would absolutely stay above 50 percent of BEP and try to stay above 75 percent, as noted above.
Johnny Pellin
RE: Unusual cavitation on impeller outer diameter tip
RE: Unusual cavitation on impeller outer diameter tip
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Unusual cavitation on impeller outer diameter tip
Walt
RE: Unusual cavitation on impeller outer diameter tip
RE: Unusual cavitation on impeller outer diameter tip