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Old 02-01-2005, 10:22 AM   #51
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Not to push it or be mean: but do you have the pictures?
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Old 02-01-2005, 09:34 PM   #52
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I've finally found the article on aquarium plumbling ... It is at advancedaquarist.com. The article is a rather detailed engineering discussion, far more than my basic understanding on fluidics.

To make a long story short ... If I understand the equations correctly, the max flow rate of a 1" PVC overflow is around 400 gph. <I didn't worry about the elbows, etc. real number prob. a bit lower>. Since resistance in pipes varies with 4th power of radius, I would expect only 1/16 the flow rate in a 1/2" system (or 30-40 gph).

Also, it seems my idea of using a long in tank loop to enable a high head pressure to drive the siphon won't work. The resistance of the extra tubing is offsetting any gains in driving pressure.

I am just wondering if anyone has any real flow numbers to back up or refute my estimates. If my calculations are correct, I'll have to look at a different system (maybe one of those continous flow through box), as I am aiming for 800-1000 gph.
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Old 02-01-2005, 10:45 PM   #53
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Lets see if this helps anybody. I built this simple overflow out of 2 lees specimen cups, two pet store bought u-tubes, and a bunch of 1" pvc fittings and pipe. The drain to the sump is 1" but I found that by lowering the height of the pvc in the outside specimen box it did increase flow. I also have found that adding 2 u-tubes did very little to increase the flow rate, but I don't exactly know why. The u-tubes are 1 1/4" and with this system I'm getting about 400 gph, though I still want more gph, my pump is rated at 800 gph, and I'm considering t'ing off back into the sump to reduce pressure on the pump.
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Old 02-02-2005, 05:44 PM   #54
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With 2 1-1/4" siphons & You are still at 400 gph, that doesn't bode well for the 1" PVC overflow's flow rate .... unless your bottle neck is at the skimmer box or the sump drain ....

I was hoping people will tell me my numbers are bull & they are getting great flow with this thing .... still waiting ....
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Old 02-02-2005, 10:11 PM   #55
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Tested last night with a gallon jug and actually got almost 500 gph, close to what I wanted, but still I think the most reliable way is the continuos siphon overflow, the weir method if you will. Good luck, I just found that there were so many factors in siphoning that I wasn't understanding...or maybe still don't. Like lowering the height of the pipe in the outside overflow box only 1/4" increased my gph by about 100 gph. It just takes lots of prototypes, and sometimes it ends up costing more than just buying the best one you could find to begin with. It isn't any fun that way though.
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Old 02-22-2005, 11:27 PM   #56
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