overflow size calculations

[NicolasFSS]

I am building a custom 400 Gallon tank with a 100 gallon sump. I want to have a bean animal overflow but I am unsure how to determine the overflow box size and where I live the reefing community is inexisting and my glass provider has limited tank know how. Can anyone guide me on overflow and pipe size? I will operate a 3000 GPH return pump. any help is appreiated.

 

[DCR]

How much circulation are you actually trying to achieve? A 3000 gph pump will likely only deliver about half of that in an actual installation when the required head is factored in. You will likely be into at least 1-1/2" piping (supply) and 2" return or multiple smaller lines. I would not go with less than a 3ft wide overflow box from either Modular Marine or Exotic Marine

 

[NicolasFSS]

Thank you, will check out these boxes.

 

[chome360]

Thank you, will check out these boxes.

What did you end up doing? I'm in the exact same scenario with roughly the same size tank.

 

[UncommonSense]

What did you end up doing? I'm in the exact same scenario with roughly the same size tank.

I’d go 1.5”-2” for drains, 1.5” return pump manifold, return portion split to at least two 1-1.25” returns…

Overflow weir would probably need to be 2ft long dead minimum, unless massive teeth are used!