SnowHeart
10-23-2008, 11:02 AM
I'm planning out a 90g FOWLR tank with a 29g sump. The return pump is going to be a Mag 12. The pump has a 3/4" outlet but the instructions say the pipes should be double the diameter of the outlet for maximum flow -- so, 1.5". With a 4' head from the sump to the tank, that's a LOT of water that's going to be pushing back on the pump. I sent an e-mail to Danner Mfg to double-check this but haven't heard back. Anyone have experience with this? Is a 1.5" return pipe feasible?
FWIW, I ran this through the head loss calculator on Reef Central at 1.5", and the number it put out was pretty much on target with the Mag 12's specs. When I reduced the pipe diameter to 1", the flow dropped about 40% and was well below spec.
FWIW, I ran this through the head loss calculator on Reef Central at 1.5", and the number it put out was pretty much on target with the Mag 12's specs. When I reduced the pipe diameter to 1", the flow dropped about 40% and was well below spec.