Diy overflow box diagram - help needed

OCELLARIS

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hi guys




i have a diagram of a friend who had emailed me a sketch of an overflow box
that he has and is currently using it on his reef tank, it is a fail safe siphon so when the power is out the siphon stops and when the power is back up it starts again
this is due to the T-piece pipe and water level that allows it to do so...

unfortunately he did not give me instructions on how to go about doing it or even
explain what the diagram consists of or where is each piece, wheter they in the tank and what goes down to the sump ect... he managed to email this to me before their emailing systems bombed out on him so i have no contact with him :(

could some one please help me with explaining it from what they see from their experience, my friend works for a company that specializes in building of marine tanks, equipment for tanks ect...
 
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Alan

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Damn that looks messy, there is a better way of doing it i must just find the diagram, stick around it was from a few years back, may take some time.
 

OCELLARIS

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hi there thalion

thank you, infact i have been battling to get that picture posted
i tried so many ways until i finally had to get the url link for it and had to even get the pic recoded, there seems to be a problem with some of my functions on this site so im like restricted , like instant email notifications,posting pic ect...

but its ok ;)
 

OCELLARIS

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alan these sites for the overflow box you gave me, are they
100% still working even in a power failiure and then 100% after
the power failiure, i mean the starting and stoping of the siphon
 

OCELLARIS

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hi alan

the reef,org site
tell me something, it has a tube at the top to start the siphon
but is this a continous flow with a stop and start automatically
even when the poer is out?
 

viper357

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Looks like Alan died. Have you figured anything out yet Ocellaris?
 

Reef Maniac

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are they 100% still working even in a power failiure and then 100% after the power failiure, i mean the starting and stoping of the siphon
No siphon is 100% safe. Over time, small air bubbles will accumulate in the top of the siphon overflow. As these bubbles accumulate they will merge and form larger bubbles, replacing water. After a few weeks/months (depending on flow velocity through the pipe) the air pocket will displace enough water to cause a siphon break when there is a power outage.

The most foolproof method to minimize this risk is to add a small power head with an air intake venturi (most small power heads have them...) next to the siphon, drill a small hole in the top (highest point) of the siphon overflow pipe, and connect a piece of airline tubing from that point to the power head. In operation the power head then continuously sucks the air out of the siphon overflow pipe, preventing air build-up. It will also make it much easier to start the siphon in the first place, as it will fill the siphon overflow pipe automatically when switched on. Just keep in mind that Murphy has a way to defeat even the best designs, so to be really safe you should also add a water level float switch to cut off the power to the circulation pump if the level in the sump drops below a safe level.

Hennie
 

OCELLARIS

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Looks like Alan died.
hi viper
i guess you are right .... :lol:

infact i have been researching and reading and gaining advice from
like all over the net, but i came to a conclusion that the siphon isnt
100% safe :( and in total cost of building an over flow box with all
plumbing will cost me abit and also take me some time to locate
all items and not forgeting if the specs are met and its working 100%
if not then its another cost again to rebuilt or repair, so i decided
why not get a small submersed water pump yet still use an over flow box,

have that water pump,pump the water from the overflowbox into your sump and a return pump to bring the water back, reason for the overflow box is so it still skims
the top layer of water so O2 can be exchanged to an extent

so i have a 2ft tank of volume : 60L and a sump of between 40L to 50L
so would getting to submeresed water pumps of the same rate be the best for this in the case of the rate of what has been pulled away from the tank to the sump and whats returning from the sump to the tank?....
 

OCELLARIS

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hi Reef Maniac

i do understand what you said, tell me the water level float switch
where can i get it and how much would that be
 

Reef Maniac

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Here is another sketch of a siphon, just to make it a little clearer how they work:

1094892a42f8f875.jpg


And, of course, the siphon overflow does not have to be a pipe. I made this "box" overflow many years ago when I started with my first tank, as the bought "pipe" overflow could not handle the amount of water my return pump supplied. The airline visible in this photo actually goes unto the mouth of the overflow "box" and then up to the top of the overflow on the inside - I later just drilled the top of the overflow and added the airline directly to it from the outside.

1094892a485ded2c.jpg


Hennie
 

Storm

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Overflow Boxes are safe and will not brake there siphon or flood the floor if setup correctly. You just need to make sure the ""Plastic Pipe"" in the ""Outer Box"" going down to the sump is ""Higher"" then the pipe in the front box which is feeding water to the ""Back Box"". Otherwise it will brake the siphon if the power goes out. U will also from time to time hear a horrible vortexing sound cumming from the ""Back Pipe"", for this i recommend u experiment with hosepipe nozzels, turn them upside down so that the head is inside the pipe. And lastly if ure not sure how to set your rates, then just make sure the water comming down the pipe is MORE then the water going up, otherwise u will run your return pump dry. If u got any questions please ask as I am also using a overflow box for my setup.

Here is a pic of my outer box to help explain some confusion, now remember the box on the inside of the tanks pipe is lower then then the Pipe going down.

IMGP0577.jpg
 
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Storm

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And that advice is based on how many years of personal experience ???
+/- 1-2 years worth of experience working on my own tank and friends and family's who use overflow boxes aswell. As i said if setup correctly it will not brake, mines never even sucked up bubbles, nor broken its siphon. Cant think of anyone i know whos has either. Anyways these are my personal experiences, i share them, people can use or not use them im just here to help and learn something new in the process :)
 

OCELLARIS

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hi storm

i get it, the outer box sump pipe is higher so as to stop the intake of wter
in a power outage yet still have the u shape tube submereged so the siphon is
still there, but reef maniac quoted that the presence of small airbubles that builds up
over time and effects the spihon, storm had you experienced such an event?
 

OCELLARIS

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thanx storm

did you diy the overflow boxes or have you had them bought?
i think i will give the overflow box a chance :)
 

Storm

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Nope, ive never seen air bubbles or had to re-siphon my U tube. But u got the concept about the back pipe right, wd ;). And i had my box custom built, cost me R250.
 

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