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Old 12-07-2018, 08:41 PM   #52
Delfin
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Join Date: Jan 2010
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Quote:
Originally Posted by Simi 60 View Post
I had electric centrifugal pumps suggested to me after I had bought a spare belt driven impeller pump for our 855 Cummins after having a pump get the death wobbles a year or so ago.


With higher rpm requiring more water flow how was the speed of the pump controlled?
The hydraulic cooling impellor pump I replaced was constant speed, so I just matched the flow with the Grunfos I replaced it with. That is s closed coolant loop. If I replace the pump on the genset, same scenario as it is constant speed. The main would be a different story although I imagine proportioning valves could be used if you have raw water mixed with the exhaust. Since I'm dry stack, keel cooled with a closed system I fortunately don't have to worry about that.

I've already replaced the Northern Lights genset pump once due to sea water seepage. $600, which is an absolute rip off. The rebuild was $500. The new one is already starting to seep as well.
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