Thanks for the response, yes I was referring to the wear ring region...
The impeller and casing ring both have run out requirements below .005. I would imagine that a leading cause would be during startup and shutdown of the unit when flow through the pump is limited thus removing any water...
First off, we are changing the design the remove the contact, but are looking at ones already out and about that could have this issue.
I am trying to calculate the worst case scenario of the impeller upper shroud on a closed impeller impacting the pump casing ring. The drawing clearance is...
