Glass thick enough?

Discussion in 'Anything DIY Related' started by Fishman, 1 Oct 2011.

  1. Fishman

    Fishman

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    Im building a tank, 900 x 450 x 280 (deep). I have a 6mm base, will 4mm be sufficient for all the sides? If so i'll save time ordering and waiting for delivery because i have access to sheets of 4mm.
     
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  3. gMAN

    gMAN with the plan

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    I'm no expert but would rather go with 6mm.....just in case........
     
  4. pXius

    pXius

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    Last edited: 1 Oct 2011
  5. Fishman

    Fishman Thread Starter

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    cool. How would you brace it? Along the length of the tank or from front to back?
     
  6. viper357

    viper357 Admin MASA Contributor

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    When you say 280 deep, is that front to back or top to bottom?
     
  7. Fishman

    Fishman Thread Starter

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    top to bottom
     
  8. FransSny

    FransSny

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    Just google eurobracing for examples, basically a strip at front and back as well as overlapping strip on sides
     
  9. LuckyFish

    LuckyFish MASA Contributor

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    And put the base in between the sides. ALL tanks should have a floating base and it is so much easier to glue the tank!
     
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  10. leslie hempel

    leslie hempel Moderator MASA Contributor

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    4mm is way too thin, 6mm and braced is preferable or go 10mm and forget about euro bracing the top ;)
     
  11. Squeal

    Squeal

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  12. pXius

    pXius

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    I don't mean to disrespect a Marine guru :whistling: but at that height the pressure on the tank's "walls" are minimal.

    Even the aquarium calculator which doesn't calculate for bracing regards 4mm to be very safe.

    I would obviously not slap a wave box in there or anything hectic in there but braced 4mm at 28cm will be fine. If you have kids running around the house or a dog chasing a ball going thicker (6mm) wouldn't hurt but 10mm is complete overkill IMO.

    Again, no disrespect to les :p
     
  13. pXius

    pXius

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    To add a bit of calculus, NO, don't worry I wont do the math, unless someone wants it?... Anyway, the pressure increases with surface area, so the larger the surface area, the more pressure it needs to carry. That is one of the 2 main reasons you want a thicker base. Because it is one of the largest surfaces. Especially in your tank's case.

    The second reason comes down to the Archimedes principle. If something doesn't float its not dispensing its weight only its volume. So that means the bottom of your tank is taking the full pressure of the water and the weight of the rocks etc as well. In theory they (rocks and stuff that doesn't float) weigh the same on the bottom of your tank as they do outside regardless of water.

    So thick base, like pizza, is a good thing :p

    Other tanks, with higher walls, mine for example is 70cm high is much larger than my base, therefore carrying much more pressure, requiring thicker glass. To find out how much weight the side panels are carrying you pretty much just need to multiply the pressure with the surface area. (this is always a scary number btw) Your tank on the other hand has small "side" surface areas/panes being only 28cm X 90cm they don't carry that much pressure.

    When building any tank I would always suggest it to be braced well no matter what the size, not only does it strengthen the glass pane against the pressure, it relieves some pressure off the silicone.

    Now will someone beer me? :peroni:
     
    Last edited: 1 Oct 2011
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  14. viper357

    viper357 Admin MASA Contributor

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    :peroni:
     
  15. Tremayn

    Tremayn

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    I would use the 6mm for the sides as 4mm is pretty thin and can crack if a rock hits it etc. So atleast with the 6mm it has some strength :)
     
  16. lIghty

    lIghty

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    4mm to thin!

    I would go 8mm or 10mm. just the slightest bumb or knock and it will be a sad day!
     
  17. Fishman

    Fishman Thread Starter

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    Thank you all. Now im more confused than ever. I think i'll use 6mm just to be safe, i do have my son running around. So looks like i'll just have to wait :( Anyone have any experience dealing with furman glass in jhb?
     
  18. leslie hempel

    leslie hempel Moderator MASA Contributor

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    no stress, the reason i have said 6mm braced or 10mm unbraced is to factor in for occurences such as bumps etc.. you never think you are going to grab the edge and pull at it when you are planning and constructing a tank.. but in practical experience this hapens..

    you always need to make sure you factor in possible knocks during maintenance wich is going to be frequent..

    thicker glass also offers a better bond on the seams equalling more strength...
     
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