Rates of overflow ??

[secretweapons22]

Does anyone know the rate of flow for a 2in bulk head or how to calculate that?

[Goofball310]

i couldn't find any info on 2", but this is what i found on others.

3/4" - 300 gph
1" - 600 to 700 max
1.5" - 1400 to 1600 max

[marshall.read]

gravity flow or siphon? if gravity flow then it will depend a lot of head pressure, a lesson i learned recently. if its siphon it will depend primarily on the vertical drop between the two bodies of water as well as several other factors such as friction of the pipes. i can tell you my 2" bulkhead, drilled at the bottom of the tank, inside an overflow box with a durso standpipe handled a mag 9.5 very easily but i'm afraid i don't know the max rate it can do.

[secretweapons22]

Thanks guys, Its going to be drilled at the bottom of the tank inside a overflow box. I am getting a tank built 24 by 24 by 36 high so its going to be a unusual build, just trying to figure out my max return pump size.

[Bill S]

In practice, my 1.5" handles 1500 gph fine (I have 2, I can block one and it still handles the flow)