Max flow from 2" inlet?

[sphelps]

Originally Posted by Spyd

You are better off reducing that 2" pipe down to a 1" pipe. 2" will cause a lot of pressure required from the pump to push that much water. Running 2 pumps would cost a lot of money. How big is your display tank? I recently purchased a Water Blaster HY10000 pump. It moves 2600gph of water and is very energy efficient.

Ahh no that's not correct. Pipe diameter has absolutely nothing to do with static pressure. Static Pressure = Fluid Density * Gravity * Static Height

What is affected is the total head pressure from friction loses however the larger the diameter pipe, the lower the friction losses.

So 2" will have same static head as 1" pipe but 2" pipe will have lower friction losses so using 2" pipe will actually have less total head pressure on the pump and therefore result in more flow than 1" pipe, even if the pump is really small.

As for how much flow a 2" pipe can handle it depends on pump pressure but I'm not aware of any aquarium pump that can exceed the limitations of a 2" line. Consult the RC head loss calculator to get a better idea on what you're dealing with.