Bean animal drain size in external overflow for 180g tank

[alexebrenz]

What minimal drain size should I use for bean animal overflow?

I will use an external overflow on the back of the tank.

72"*24"*24" tank (180g) on a 3' stand. 75g sump below the tank inside the cabinet.
Enhein 5000 compact pump (1320 GPH) inside the sump. With head loss I belive it is 925 GPH.
I would like to run about 5x180g water flow for filtration. For circulation I will use 2xTunze 6085 pumps (2100 GPH). Planning to keep softs and LPS.

I have limited space between the wall and the back of the tank where the overflow chamber is. I would like to use 3 x 1" bulkheads inside the chamber.

Does make any difference to have 1.5 pipe connection just below the chamber?

What is the recommendation to minimize the chamber space?

 

[hdking]

Your water flow will only flow as fast as the smallest part of your system will allow. So no, I don't believe it will. Look at a Herbie drain..I believe it will take up less room. That's what I'm planning on doing to my 180 I'm setting up now.

 

[TankWater]

Your water flow will only flow as fast as the smallest part of your system will allow. So no, I don't believe it will. Look at a Herbie drain..I believe it will take up less room. That's what I'm planning on doing to my 180 I'm setting up now.

Agree. I have a 300g with 2 external overflows. I'm doing "Herbie" with 1" drain and 1.5" emergency per overflow. I am pushing 2000GPH easy. With only one overflow I would recommend 2 1" emergency drains if go can not go bigger than 1" for the emergency drain. Go Gate Valve too, a lot easier to adjust.

 

[alexebrenz]

If I use 5 x 1" full siphon? Will it work? Two full siphon, two emergency and one for low drain?

Herbie is not set and forget.. I prefer bean animal

 

[alexebrenz]

What is the water flow for 1" full siphon pipe?

 

[hdking]

They say 1500 gal/ hr

 

[alexebrenz]

My pump will push 1320 GPH. If the full siphon drain supports 1500 GPH... Why it should not work?

 

[alexebrenz]

Sorry in this article http://flexpvc.com/WaterFlowBasedOnPipeSize.shtml
I see 1" drain will support 960 GPH. My pump supports 925 GPH with head loss. So I can adjust the 1" full siphon. Is this correct?

 

[hdking]

I believe it will