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Old 02-24-2009, 02:05 PM   #11
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Ahhhhhhh...I see now. Very nice. That's what I'll do then. I appreciate your help. The sump will be 20 gallons and sit approximately 4 to 5 feet below the top of the tank. Any recommendations (with that 800 gph OF box) as far as return pump capacity. Do I understand correctly that with the pump below the tank, it will lose capacity? (i.e. 1000 gph is more like 600?)
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Old 02-25-2009, 12:51 PM   #12
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The pump manufacturers publish tables of flow rate at different head height <ie the distance from the pump to the top of your tank>. You look up the table (Google it, or it is usu. printed at the side of the box) for the pump you are interested in & size it that way.

For those who want to see a nice pic of how the HOB overflow works:
Melevsreef.com - What is a Sump?
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Old 07-31-2009, 05:17 PM   #13
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Sorry to dredge up old topics, but this is actually the most recent on the topic.

I'm working with a HOB overflow (came with a used tank) that has a u-tube type siphon. I've been trying to figure out any kind of fail-safe to deal with a broken siphon. It sounds like you guys are saying that with sufficient flow velocity it just won't ever break. Does experience really back that up? A broken siphon would make a 50 gallon spill in less than ten minutes with my present design. Is there any engineering solution to that?
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Old 07-31-2009, 05:38 PM   #14
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Quote:
It sounds like you guys are saying that with sufficient flow velocity it just won't ever break. Does experience really back that up?
As I mentioned earlier in this thread, I used a u-tube style HOB overflow for over 15 years without having it fail once. Is that enough experience?
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Old 07-31-2009, 06:28 PM   #15
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I keep my return raised on an eggcrate stand enough above the bottom to theoretically take care of it. If the overflow ever fails, the water level drops and the pump burns out. Never happened but that's my plan Stan.
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Old 07-31-2009, 06:48 PM   #16
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As I mentioned earlier in this thread, I used a u-tube style HOB overflow for over 15 years without having it fail once. Is that enough experience?
Well, yes and no. It seems like it would be dependent on the design of the overflow box. The more turbulent the overflow, the more entrained air and the more likely the siphon will break. I've never used one before and I don't know how different they might be.

I may just run it for a few days, or do a proper cycle, with just a couple inches of water in the sump. The way my overflow is designed though the water level is going to be absurdly close to the top of the main tank.
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Old 07-31-2009, 07:02 PM   #17
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It seems like it would be dependent on the design of the overflow box.
As far as I know, there is only 1 design for a u-tube overflow. A box inside the tank, a box outside the tank and a u-tube connecting the 2 boxes.

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Old 07-31-2009, 07:19 PM   #18
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I was thinking more about the depth of those slits at the top and the width of the box, which can be varied. The narrower the box and the shallower the slits the more turbulent the overflow would be, right?

I'll just have to try it and convince myself I think
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Old 07-31-2009, 07:24 PM   #19
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I think ur over thinking it. However I believe there are those that put small tubes run by small powerhead in their tube as insurance. Keeps the water flowing, I think is the thought process.

Vague recollection kinda somewhat
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Old 08-01-2009, 12:06 PM   #20
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Having built my own overflow, I can attest that design is important. The depth of the water in the boxes & how far down the siphon sits in the water are important parameters. Basically, if water has a long way to fall in the outer box, more air bubbles are created. If the siphon is down deep, less bubbles gets in. After tweaking, I have not have a siphon break for over 2 years now on my latest DIY effort ..... I am sure a commercial one would do better.

Personally, I am leery of using a PH to evacuate air from the siphon. When your power goes out, there is bound to be leaks in the pump, and if the pump don't start up when the power comes back on, you have trouble. <That's why I don't go for the wier type OF, which needs the PH.>

And I also raise my pump up in the sump to limit the amount of water it can pump in case of OF failure. Never need to use it, but a good insurance.
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