pump damage?
pump damage?
(OP)
We have a system, hot water circulating through 4" lines with 4 pumps with 10hp motors . Only 1 motor / pump working at a time. The hot water is circulating through all the pumps even thoug they are not running . Is this a bad design for the non running pumps because when the water passes through the pumps it makes a lot more noise than going through the running pump.
the pumps are in pairs at differrent locations of the systems.
the pumps are in pairs at differrent locations of the systems.





RE: pump damage?
Is there some problem other than acoustic noise?
Mike Halloran
Pembroke Pines, FL, USA
RE: pump damage?
RE: pump damage?
RE: pump damage?
Another consideration is if Impellers are fixed with screwed bosses, then wrong rotation can cause them to unscrew from the shaft and cease on the casing.
Ash Fenn
www.cdrpumps.co.uk
RE: pump damage?
RE: pump damage?
Parallel bore and keyway is by far the best way to secure Impellers, but i guess were diverting away from the actual question being asked here !
Ash Fenn
www.cdrpumps.co.uk
RE: pump damage?
But I agree with you on starting pumps that are running in reverse however, I know of one very large installation of a few thousand HP where the starting torque on a stationary pump was too high for the electric drive to get in underway, the cure was to to allow the pump to start rotating in reverse with return flow before pushing the start button - this overcame the high starting torque.
RE: pump damage?
RE: pump damage?