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Unread 01/11/2005, 05:44 PM   #26
tboned
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I aslo think (but not for sure) if you make the whole overflow smaller (not pipe size - Just shorter) it will increase the flow rate


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Unread 01/11/2005, 06:37 PM   #27
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Very interesting. Well thought out though and looks like it would definitely work. Any reason you went with two drains instead of one bigger one (for linear overflow space)


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Unread 01/11/2005, 06:51 PM   #28
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now, you need to cut teeth into it for a strainer and paint it purple with primer to help hide it and it would be super sweet.

If the tests on the spare 10 gallon work well, I will use it on the new 65 instead of drilling it.

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Unread 01/11/2005, 06:52 PM   #29
tboned
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stabilty on the back and incase one broke siphon you still have the other
and it give you more are to skim the surface


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Unread 01/11/2005, 06:56 PM   #30
tboned
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Quote:
Originally posted by speakeraddict
now, you need to cut teeth into it for a strainer and paint it purple with primer to help hide it and it would be super sweet.

If the tests on the spare 10 gallon work well, I will use it on the new 65 instead of drilling it.

speakeraddict
I thuoght about rasing A & N above water level and cutting slits in them and capping them so that nothing could get in except water

When it works for you take some pictures for everybody Please


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Unread 01/11/2005, 07:11 PM   #31
speakeraddict
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I shall.

I will take pics after I paint them with primer so they can see the finished product. I think I will start out with the teeth so there are no surprises after I cut them.

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Unread 01/11/2005, 07:13 PM   #32
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Quote:
Originally posted by Nolte919
To skim the surface of the water instead of drawing it from the bottom of the tank.
Doesnt look like its setup for that. As soon as the water level drops that thing is useless.


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Unread 01/11/2005, 11:41 PM   #33
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are you sure that will work? i think your tank will overflow before the overflow starts its siphon. your overflow needs to set lower than the water level for it to work properly.


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Unread 01/12/2005, 05:56 AM   #34
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pvc overflow

I have made these for some time. They are great when you cannot drill. This design is redundent. You only need one pipe and the cap must be removed or drillied or it will empy when the pump shuts down, just make it bigger. I used these once when I built a central system for a shop and the tanks were already full. It is a great answer when drilling is too risky.

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Unread 01/12/2005, 06:10 AM   #35
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Inflames:

Why and how would the water level drop? It's gonna skim the surface as much as the return pumps flow allows it to.
The water level will only drop in the sump not in a main display tank.

z_rivers:

How exactly would that explain other HOB overflows working? This design while probably overly complicated works fine.


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Unread 01/12/2005, 06:23 AM   #36
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Looks perfect to me.

tboned, wonderful idea.

See ya this weekend.

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Unread 01/12/2005, 08:20 AM   #37
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Add this to the confusion

I have been following this thread for awhile and it would fit nicely on the top of your overflow.

Another overflow


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Unread 01/12/2005, 08:45 AM   #38
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Question

What do you think the maximum drain rate is using 1" and 1.25" ? 500-600gph?

I might make one for 300-400'ish gph for my 29gal, size the PVC used down to .75" and 1"


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Unread 01/12/2005, 04:38 PM   #39
tboned
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my design should give you like 1000-1200 GPH


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Unread 01/12/2005, 04:50 PM   #40
tboned
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Pipe size ...... Gallons Per Hour ........... Gallons Per Minute
½" ........................ 480 ................................... 8
¾" ........................ 900 .................................. 15
1" ........................ 1,500 ................................ 25
1¼" ..................... 2,700 ................................ 45
1½" ..................... 3,600 ................................ 60
2" ........................ 5,400 ................................ 90
3" ....................... 13,500 .............................. 225
4" ....................... 21,000 .............................. 350
6" ....................... 42,000 .............................. 700


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Unread 01/12/2005, 05:09 PM   #41
tboned
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Re: Add this to the confusion

Quote:
Originally posted by gath2
I have been following this thread for awhile and it would fit nicely on the top of your overflow.

Another overflow

I like that Idea


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Unread 01/12/2005, 05:51 PM   #42
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Becareful with those standard flow rate charts, you sure that's not the maximum flow? I had an overflow box that was hooked to 1" pvc, my pump pushed about 700gph into the tank the single overflow could not keep up.

Out of curiosity though, isn't the total amount of water that will go in restricted by the total area of your skimmer box (or in this case pvc pipe) which in your case is very small, 3.14inches worth of skimming area (times 2). Oh well guess if you dont have much of a return pump should work. It is interesting though.


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Unread 01/12/2005, 06:05 PM   #43
tboned
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Quote:
Originally posted by sfsuphysics
I had an overflow box that was hooked to 1" pvc, my pump pushed about 700gph into the tank the single overflow could not keep up.
thats one reason I went with 2 pipes
I also restrict the return with a ball valve just incase
and if my center pipe won't handle the water flow you can split the + and run 2 different pipes


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Unread 01/12/2005, 06:55 PM   #44
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½" ........................ 480 ................................... 8

I dont think so. Maximum flow rate of 1/2" pvc is around 350-400.


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Unread 01/12/2005, 07:42 PM   #45
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Smile Another simple overflow

This is the basic layout. This one is of 3/4" pvc. Notice how long the arm are. these help increase flow using the siphon. You can make them any size. I make one of 1 1/4" for a larger application.
These make great overflows surface extractor when you cannot drill. I used these for a pet store central system where the tanks were established and drilling was too risky



DEMOVID


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Unread 01/12/2005, 07:45 PM   #46
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Talking Another view of the DEMOVID overflow




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Unread 01/12/2005, 07:50 PM   #47
Aquayne_wv
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Here it is on a 10 galllon

Here it is on a 10 gallon tank. The hose insert on the end is 3/4" and a length of Corrigated circuit hose from a home health care seervice. It is the stuff used on ventilators and breathing machines

Notice how it ballances over the glass.


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Unread 01/12/2005, 07:53 PM   #48
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More of the overflow

This is the back, when the hose is added it makes it hang better.



DEMOVID


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Unread 01/12/2005, 08:01 PM   #49
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Another Idea

This is a useful modification. The overflow tube is actually a little too long in this picture but you can get the idea.

I took a tee and cut off one of the legs. So now it is an open elbowed elle. This allows for the correct functioning of the unit and adds the ability to use a sponge as a prefilter. The open top is in case the sponge gets clogged and water level rises too high. The added tube is drilled for a sponge to fit over it and allow water flow. It is great for fry tanks or Seahorse tanks.




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Unread 01/12/2005, 08:08 PM   #50
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The one thing that is missing is the anti siphon valve that is inserted in a drilled hole on top. This allows me to suck out the air bubbles that collect there. You can also run an airline from the valve to a power head so that the suction continuously pulls air bubbles out. These are very stable.

These things look great painted black. I break the gloss with pvc primer then spray with vinyl spray found in auto parts stores. Just let it cure for several days. The last one I did took a week before the smell went away. Inverts grow on it with no problem.

DEMOVID@HOTMAIL.COM


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