Steve,
You keep saying that the flow in these loops is always waaay down in the laminar range, but my instinct tells me that's too far in the weeds. Also, when I do some research there are many posts where laminar vs turbulent pops up & is discussed at length. The GPM bandied about in those posts to get turbulent is no where as high as your numbers or suggestions are. Something seems amiss.
Are you confident with your calculations? I would hate to leave a post in this thread with misleading information.
Len
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