Overflow?

This overflow model will work just fine. I personally see no benefit to this over a standard overflow (aside from maybe a smaller in-tank footprint). 'Skimming power' will be the same, because all the surface water is going to it. But if you prefer this, go ahead.

 

Thanks a lot.

 

This is just a mock up, I'm not sure on the return piping yet with the lengths and how it will affect my head loss. Or with the size of pump to use for good flow. It will either be 75G-90G not sure yet.. still in research mode..

 

Sorry, I dont. : ( But Ill give you the run down.

I have 2 corner overflows. Each has a 1" and 3/4" bulk head.

The 2 1" bulkheads are the drains. The standpipe is cut about 2-3" below the teeth of the overflow. They each have a sch 80 gate valve (important for fine tuning) in the cabinet underneath. They then tee together and enter the sump.

The one 3/4" line is for the return to the display tank. I pump about 1200 GPH through it. The other 3/4" is a dry emergency drain. It is cut above the the overflow but below the top of the tank. This way during normal operation water does not enter it. Only when the water gets too high.

Why does the water get too high? The goal is to dial the gate valves closed enough to get the standpipes to suck only water and no air. If you close it too much, or something gets sucked in, your return pump is going to pump faster than the drain can drain and it could overflow the display. Enter emergency drain.

Also be sure to test the emergency drain. I can close both valves all the way and the 3/4" pipe takes all of it. So in the event I get a 100% blockage in both drains, Im still covered.

Hope this helps, if you have any questions, feel free to ask!

 

This isn't his tank ^ but you get the idea. They all work basically the same way. 2 overflow lines, 1 return. Overflow is Coast-to-coast (so it's quiet), made of glass. You could make it only part way across the tank if you want, but it will be a bit louder.

The process is explained very well in this tank build.

http://www.3reef.com/forums/show-off-your-fish-tanks/exactlys-90g-mccoskers-show-off-110447.html

Other 3reef search results...

http://www.3reef.com/search/?cx=par...sale-san-diego-134087.html&ref=www.3reef.com/

Here's a large scale version of the herbie/bean animal style overflow.

Glass Reef - The Basics - Overflow