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Old 12-06-2003, 06:33 PM   #1
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what GPH should a 1 inch overflow handle?

I'm experimenting with a DIY overflow (pictures will come once it works!) and I'm concerned about the flow i'm getting. I'm using 1 inch PVC but.. I'm using a Mag 9 as a test pump and the pump is winning hands down in about 4-5 seconds.

Is my overflow carp or am I simply expecting too much of a 1 inch pipe?


Thanks fellas!


PS... anyone happen to have an honest to goodness fluid dynamics mathimatical formula to determine that?
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Old 12-06-2003, 06:43 PM   #2
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600 GPH is about it. You may squeeze 700 out of it but the tube will be submerged.
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Old 12-06-2003, 11:07 PM   #3
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ok, that actually makes me feel a little better then! That Mag 9.5 is pumping a lot more than that right now (it's in a bucket on the floor next to the tank so the head is only about 3-4 feet)


no luck on a mathimatical formula?
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Old 12-06-2003, 11:25 PM   #4
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Found this at:
http://www.pondkits.com/pond-resourc...e/Tubing%20gph

The chart seems higher than normal to me - what do you guys think I dunno

deserves a field test....

Pipe/Tubing gph

1/2' size: Up to 300gph
3/4" size: Up to 500gph
1" size: Up to 800gph
1 1/4" size: Up to 1500gph
1 1/2" size: Up to 2300gph
2" size: Up to 5000gph

I agree, a formula would be handy, I'll keep looking around

Woo hoo I'm gonna go buy some Iwakis and some 2" tubing and go 5000GPH in my 55G!! LOL
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Old 12-07-2003, 12:25 AM   #5
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that chart seems about right

from my tests, I've found that 3/4" can handle two maxijet 1000's (about 500-520 gph), but could not handle a single 750 gph pump

1.5 inch could handle 2 maxi1000's and a 750 gph, and still had room to spare- but I ran out of pumps to test further.

I haven't built a 1" yet, but I'd think 900 would be slightly above it's capacity

do you have room to add a second drain? that should help maters greatly.
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Old 12-07-2003, 01:12 PM   #6
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I dont like RC but heck helping someone out comes first.

http://reefcentral.com/calc/

There are a few calcs that you might find of interest.
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Old 12-09-2003, 03:49 PM   #7
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Thanks a ton folks!

I think i'm basically going to add a second unit to the system. I'll post some pics tonight when I get home... I've basically built a boxless overflow... i like to call it...
[center:e242dfa074]The Z-Flow[/center:e242dfa074]
cause it looks just like a Z... when you stretch out the parts, and look at it sideways, and cover it with a piece of paper with a Z on it
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