Durso

Discussion in 'Pumps and Waterflow' started by whipper, 21 Aug 2016.

  1. whipper

    whipper

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    Hi guys.
    I sumped my Lido and made a durso. My pump is

    [​IMG]

    I'm struggling to stop loads of bubbles in the sump at the outlet.
    I can get rid of them completely if I turn the pump down to minimum but I'd like to up the return if possible.
    Playing with the air inlet doesn't seem to really help.
    There is some noise from the water falling down the overflow pipe. I used 45° elbows, would 90° ones be better? My thinking was it would be more of a 'smooth' flow?

    Any suggestions?


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  3. RiaanP

    RiaanP Moderator

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    45 is better. 90 make more noise

    Maybe a picture of the sump area.
     
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  4. whipper

    whipper Thread Starter

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    [​IMG]
    [​IMG]
    [​IMG]

    Best I could get.


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  5. viper357

    viper357 Admin MASA Contributor

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    I think you need a ball valve or gate valve on there.
     
  6. whipper

    whipper Thread Starter

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    On the return or the overflow?


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  7. whipper

    whipper Thread Starter

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    @viper357 sorry for the dumb question obviously for the overflow as I can control the return by adjusting the pump. I'm going to go get a valve as soon as I get a chance. Gate better than ball from what I've read?

    @RiaanP It would help me, I think:whistling:, if I knew what was the cause. Are there more bubbles because the water is moving too fast down the overflow pipe and therefore pulling more air. If so reducing the air by closing the air inlet should help in my mind or slowing water down the overflow pipe by adding the ball/gate valve? Slowing the flow in the pipe would raise the level in the over flow box though. Is there a minimum height? Should there be a bit of a drop over the edge of the overflow or can/should it be level with the tank water level?
     
  8. viper357

    viper357 Admin MASA Contributor

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    Sorry, missed your reply.:blush:

    Yes, a gate valve is much better, although more expensive than a ball valve, but it allows you to make much finer adjustments. If you place it somewhere on the downpipe and then start slowly restricting the water flow it should quieten it down quite a lot, it is a bit of a balancing act as you don't want to restrict the flow too much or it will build up and overflow your main tank. Here are a few pics to give you an idea...

    valves_durso_syphon.jpg

    15795022117_f2d2c9d349.jpg

    standpipe-back.jpg

    externaldurso.jpg

    Overflow-14.jpg

    plumbing16.jpg
     
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  9. whipper

    whipper Thread Starter

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    Ok great! @viper357 Mines like pic 4 without the valve. I'll have a look at what the gate valve costs. Judging by those pics most look like ball valves so I guess the gate valves are very expensive!

    Luckily I never bonded all the pipes!
     
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