I can't say I have ever mounted an impeller that weighs 6K pounds, but it does seem odd that the design calls for threads to position the impeller to the shaft with such a high degree of precison.
Does the impeller stop against a shoulder or location feature?
I would be very interested to see this assembly! I think I would look for options if it is really that critical. I would not recommend placing the burden of precision on threads alone, but that's just me, and I don't really know all of the details of the application.
Scott
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