Need help with this calculations

Discussion in 'uncategorised' started by ben lloyd, 12 Feb 2009.

  1. ben lloyd

    ben lloyd

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    Hi guys
    I need some help here, i need to work out how much water will run out of my tank when the there is a power cut, staying on the plaas this happens regally.
    What happens when the return pumps stop the water don't, it will carry on running till the level in the tank has drop to below the out let level.
    The surface area of the water is:

    width - 1020mm
    length - 3600mm
    i presume the volume of the return pumps will influence the total volume of the tank as well , at this stage it's 8000l/hrs, but this is going to change if we can get some sort of formula to work it out i can do it again when the new pumps are installed.

    thanks!
     
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  3. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Ben what is the depth of your outlet pipe fail safe syphon?
     
  4. ben lloyd

    ben lloyd Thread Starter

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    it's an over flow system 950mm width into a box
    [​IMG]
     
  5. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Sorry, I got a bit mixed up there. I meant your inlet pipe. Return from your sump.
     
  6. Monti

    Monti

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    Surface area multiplied by the depth that your inlet/ return and convert to litres. In other words say your return pipe sits 5 cm into the tank (taken from the top of the water level). then it is 1020x3600x50= 180 odd litres.

    Thats a nice size tank by the way
     
  7. ben lloyd

    ben lloyd Thread Starter

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    my return pipe is going strate down to the bottom of my tank were it pumps into a network of pipe to distribute the water evenly in the tank,
     
  8. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Ok so about 1-2 cm below the water surface you are going to have to drill a hole to prevent water from going back to the sump (fail safe).
     
    Last edited: 12 Feb 2009
  9. Monti

    Monti

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    Agree with mekaeel. You'll need the hole to break the siphon
     
  10. ben lloyd

    ben lloyd Thread Starter

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    a hole were do want to drill a hole in the main tank?
     
  11. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Ben you got to drill a hole on your return pipe 1-2cm below the water surface.
    Get what I mean?
     
  12. Mekaeel

    Mekaeel Moderator MASA Contributor

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    By the way, how many mm is your return pipe?
     
  13. ben lloyd

    ben lloyd Thread Starter

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    2 off 20mm pvc pipe
     
  14. Mekaeel

    Mekaeel Moderator MASA Contributor

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    So you got to drill both those pipes.
     
  15. ben lloyd

    ben lloyd Thread Starter

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    but if i drill 2 hole in my return pipe then the water is going to blast out there when the pumps are running.
     
  16. Mike

    Mike Retired Moderator

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    Drilling two small holes, just below the water line is fine, water prefers the easier straight through route, but the holes will save your sump overflowing.
     
  17. Andreas

    Andreas

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    You will have to make sure that holes dont clog up with salt otherwise your entire display will syphon out:)You would need to clean the holes often:p
     
  18. ben lloyd

    ben lloyd Thread Starter

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    OK i get it if the pumps stop the water will flow back in the pipe from were it came from, and the holes in the pipes will prevent that I'll put none return vales in ,but Wat about the water in the tank how many liters is going to ran into my sump,there is noting to stop that it will cheep on over flow till the level has drop to below the out let level.
    will it be 1020x3600x? = ?
     
  19. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Ok if the above is in centimeters and the the fail safe is 1 cm below the the water level, you are expecting 367 litres of water to run back to the sump.
     
  20. ben lloyd

    ben lloyd Thread Starter

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    thanks Mekaeel i"ll have to check my sump sizes
     
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