Plumbing question

I think Mark runs 3/4" on a closed loop using a Mag 5 - check his website. His is a closed loop with minimal vertical lift. Depending on how much vertical lift you have to overcome (say 6ft or so) I would think you will be fine. Minimizing the amount of elbows always helps, as does increasing the pipe size.

Pete
 
Well with the loss from the SQWD (~20%) and the los due to the elbows and bends your probably around 500GPH which should be OK with 3/4 but you will get more flow with a larger pipe. Since the flow is already pretty low however I think I would stick to 3/4". It probably only makes 30-50GPH difference (between big pipe and small pipe) and that is not worth the plumbing headache and big pipe ugliness!

You won't have to worry about the height on a closed loop since it is drawing from the same height is is returning there is no real head pressure, only frictional presures from the pipes, bends, SQWD, etc.
 
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