Adding holes

Discussion in 'Anything DIY Related' started by dallasg, 16 Feb 2009.

  1. dallasg

    dallasg Moderator MASA Contributor

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    hi hennie and all :)

    this is what i am planning to do, but want to check i am not drilling in the wrong place.

    these are all new holes
    [​IMG]
     
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  3. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    bump
     
  4. jacquesb

    jacquesb Retired Moderator

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    Moved the thread on Dallas' request :)
     
  5. viper357

    viper357 Admin MASA Contributor

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    Just don't drill the holes too close to the edge of the glass or you run the risk of cracking the pane.
     
  6. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    about 10-15cm from the edge
     
  7. viper357

    viper357 Admin MASA Contributor

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    That's fine.

    In the pic on the right, what are the 2 holes in the centre right?
     
  8. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    overflow holes, for durso pipes
     
  9. viper357

    viper357 Admin MASA Contributor

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    How many return lines will you be having? Where will they be placed and in what direction will they be pushing flow?
     
  10. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    there are already 2 holes in the back pane of the tank, a 25mm and 40mm, i want to use those for sump and refugium returns and drill new ones at the bottom for cls and overflows.

    each tank also has 3 5000Lph sun sun pumps

    the cls each tank a 10000L external and for returns to both a 18600L pump. they will share a common sump etc
     
  11. viper357

    viper357 Admin MASA Contributor

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    If the return holes are close to the edge of the tank and depending on the placement of the sunsun pumps, I would perhaps move the bottom cls holes slightly inwards a bit more. The return lines will create enough flow on the outer edges of the tank so by moving the cls lines inwards a bit more it will help with extra flow towards the centre of the tank.

    The main idea of having a cls is to maximize the amount of flow coverage in the tank, thereby eliminating any dead spots. The placement of the cls holes will mostly depend on the placement of your additional internal pumps. If you try and work out which internal pump will be pushing where and thereafter work out where to place your cls outlets, should result in a winning combination.
     
  12. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    cool, i will move them more centrally
    trying to get as much turbulent water movement.
    i will make them about 20cm eighter side of the overflows
     
  13. viper357

    viper357 Admin MASA Contributor

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    That might be a bit too much, but of course it all depends on which direction they will be pointing. I was thinking more sort of halfway between the edge of the tank and the overflow.
     
  14. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    even better idea :) thanks

    this wont weaken the base to much?

    i will place a piece of glass between the bulkheads and tank for strength if its needed
     
  15. viper357

    viper357 Admin MASA Contributor

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    I doubt it, I've seen tanks with about 6-8 holes drilled in their base and the back pane for a cls, but best to get a tank builders opinion on that, or ask Oom Hennie. ;)
     
  16. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    cool, also waiting for leslie to reply
     
  17. leslie hempel

    leslie hempel Moderator MASA Contributor

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    is there any reason why you want to go 20mm on some of the holes? i suggest 32 as a minimum (exiting but i see you have 50mm and 25mm return) as when you add fitting you reduce your ID,s.. its safer to go bigger as a rule.. a 20mm hole with a fitting in it will be roughly 15mm inner diameter reducing flow and ading significant back pressure on a biggish pump..

    as for the positioning i have gone as much as 5cm from the edge of the base pane of glass with 32mm holes in 10mm this is generally safe but the tank heights have never exceeded .700mm (just thought you should know)

    other than that all looks fine...
     
  18. leslie hempel

    leslie hempel Moderator MASA Contributor

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    height of proposed tank and size of proposed CLS pump will be important things to consider here can you provide us with specs of those 2 items?
     
  19. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    thanks Les,

    the tallest tank is 600mm, but the overflow is to low

    using a 20mm and 50mm coz i only have those hole saws
     
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