diy overflow using only pvc

Discussion in 'Anything DIY Related' started by brettb2020, 6 May 2009.

  1. brettb2020

    brettb2020

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    i came across these plans to build this overflow. i think its brilliant and simple and man! it really works well! it holds it syphon when there is power outage. it is nice and compact, great for nano's and these plans are really good. the site is DIY Overflow Using Only PVC Pipe (DIY OVERFLOW PROJECTS)

    this overflow keeps up with a 1500lph pump. had about a 0.8m head.

    here is mine almost done: ( i really dont know why its upside down! )

    [​IMG]

    here is some pics from the site:

    from right side

    [​IMG]

    from back

    [​IMG]

    from left side

    [​IMG]

    the site has all the details for how to build and use it.
     
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  3. jacquesb

    jacquesb Retired Moderator

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    Awesome Brett - that looks quite interesting! Good find. Thanks for sharing.

    Let us know how it works for you, please?
     
  4. FransSny

    FransSny

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    Thanks brett...been looking for something like this for a while now as i want to add a second sump and would have to go the external overflow route

    let us know how it performes
     
  5. RiaanP

    RiaanP Moderator

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    For those confused, the picture is upside down.

    And put a piece of eggcrate in front of the suction part.

    Only problem is that you will not skim the top of your tank clean.
     
  6. RiaanP

    RiaanP Moderator

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    take the one inside the tank, to the bottom, then 2 bends and another back up to water level.

    Your design will syphon water out to the T level on the outside when power goes out. and that is a lot!

    With extra U in tank, can only drop to the top.

    I got it running on my playstation, since February, very succesful and no problems.

    Ok, agree, extra pipe inside, but a lot better.
     
  7. brettb2020

    brettb2020 Thread Starter

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    you are right riaan it would drain to the tee. You have to set the tee to water level of you tank. OR put a box around the intake pipe so it can skim the top of the tank and so you can put the tee a little lower to get more suction head for more flow. im busy building the box it the moment. Il post pics and diagrams soon.
    Posted via Mobile Device
     
  8. RiaanP

    RiaanP Moderator

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    No,
    The T must be as high as possible, the higher the less bubbles will enter.
    Also the inside pipe must go lower, to reduce the number of bubbles that can enter.

    I do not know how they manage to travel down 30cm pipe, but they do...
    Been there, done that, seen it... Here my T was still loo low.

    Check my thread. second page
    PlayStation - Page 2 - Members Systems and Setups
    [​IMG]
     
  9. brettb2020

    brettb2020 Thread Starter

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    that makes sense riaan. Can see you have had some good experience with overflows. :) i see reef octopus puts that black coarse sponge like stuff to stop bubble entering. What do you think of that idea?
    Posted via Mobile Device
     
  10. RiaanP

    RiaanP Moderator

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    I think it will block up.
    what you can not see in this picture, on the inside, the pipe goes back up to the water level. With small eggcrate piece on top. I had a snail travelling down that pipe all the way to the sump. :)
    And on the highest point, the piece going over the rim, I drilled a 6mm hole and inserted a black irrigation pipe from there to my powerhead venturi. So no more problems and no worries about the syphon stopping.

    I use the same idea on my combined 2 sumps tanks. To keep the syphon between the 2, it sucks back to my other powerhead. Check it out, here I got better pictures. It works beautifully.

    And I did not glued these pipes until only 2 weeks ago... living dangerously. Now it is siliconed together, so I can always re-use it later.
     
  11. brettb2020

    brettb2020 Thread Starter

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    i saw that design on youtube :) im gonna give it a try too.:). I really like that idea with the power head and venturi. Can you buy venturi's on there own?
    Posted via Mobile Device
     
  12. RiaanP

    RiaanP Moderator

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    Some powerheads come with a venturi inlet point.
    Else should be easy to make, I know the koi keepers build it themselves on the return lines.
    Can use a micro irrigation, the connection that plugs into the 15 or 25mm pipe. Onto which the 6mm flex pipe attatch that goes to the sprinkler. just cut the part that goes into the outlet part of the pump flush or have it at 45degree angle facing downstream. That should cause enough suction to be able to pull down air.
    But this does not work on powerheads smaller that 1500L/h.
     
  13. Munky82

    Munky82

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    Hi Riaan
    The T, does it have to be lower then the inlet inside the tank or will it still flow if it's at the same level or higher ?
     
  14. Phyrannus

    Phyrannus

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    check this out

    Check this amazing pipe overflow
    :: View topic - pvc pipe overflow.. alá spy_i (visually aided)

    I'm also using this design overflow.
    I've noticed that outlet TEE is where the water level stopped when return pump turned off. The lower the TEE the higher the water flow. the higher the TEE the low water flow.
    I remember its the principle of gravity anyway..
     
    Last edited: 3 Mar 2010
  15. RiaanP

    RiaanP Moderator

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    The T must be below water level.

    But if too low, then you will get a lot of bubbles going all the way down and into the middle section. So you must make a plan to remove this air, else eventually your syphon stops.

    If T is higher, then the amount of bubbles are less. But still, some can and do travel all the way down a 400mm pipe that is full of water. This greatly depends on the water flow rate.

    Last issue is that like on my layout where I suck the air out via a powerhead venturi with a 6mm pipe, you have to check that pipe weekly. It can block up. But the advantage is that on a power outage, it will automatically restart your syphon.

    I'm currently using the same air suck out method combining two sumps temporary. Old sump to new sump until new DSB is up. Just a 50mm connection like an upside down U. Got a powerhead in new sump next to skimmer. And that powerhead does 2 things. Keep settlement suspended for skimmer pump to pick it up, and keep the air out of the connecting pipe.
     
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