Advice needed on setting up a 2m*2m cube

Discussion in 'General Discussions and Advice' started by squire, 19 Nov 2010.

  1. squire

    squire

    Joined:
    30 Dec 2009
    Posts:
    32
    Likes Received:
    0
    Location:
    Burgersfort
    Hi guys,

    I've just moved towns (new job) and have decided on a new tank.

    I am toying around with the idea of a 2m * 2m * 600mm cube, located in the centre of a room thus having 5 viewing sides.

    Please, i need some advice on the pros and cons of such a set up before i actually decide on the way forward.

    All help will be greatly appreciated.
     
  2. AdS Guest




    to hide all adverts.
  3. AfricaOffroad

    AfricaOffroad

    Joined:
    12 Mar 2010
    Posts:
    1,696
    Likes Received:
    35
    Location:
    Ballito, KZN
    Do you glass thickness calcs carefully.
    Highest stress points will be the vertical silicon joints between the two 2m sides.
    I dont believe a normal joint will work here.
    Talk to robvdv and see how he did his panel to panel joints on his big tank
     
  4. Bob the (reef)builder

    Bob the (reef)builder

    Joined:
    7 May 2007
    Posts:
    1,779
    Likes Received:
    32
    Location:
    Joburg
    With a 600mm deep tank it makes no difference whether the tank is 2m or 200m long the pressure on the joins is the same (the glass bending and breaking is the problem the longer it gets). 600mm is easily catered for with silicon.:)
     
    Last edited: 19 Nov 2010
  5. RiaanP

    RiaanP Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,163
    Likes Received:
    1,231
    Location:
    Centurion
    I though a cube got 4?

    Check Dorry Pets display tank for having 4 view sides with side hidden overflow.
     
  6. mariusmeyer

    mariusmeyer

    Joined:
    7 Jul 2009
    Posts:
    3,054
    Likes Received:
    210
    Location:
    Jukskei Park, JHB
    In theory you can have 6 viewing sides. Underneath and from the top if you want to be technical. I think he is including the top view as well.
     
  7. Manic

    Manic Moderator

    Joined:
    12 Mar 2009
    Posts:
    3,313
    Likes Received:
    58
    Location:
    Johannesburg, Edenvale
    Not really, the pressure on the glass is all the same but the force on the glass due to water pressure is a component of the surface area. The larger the surface area, the larger the total force acting on the glass and in turn acting on the silicone joints. Having said that, the force will be no different to a tank that is 2m long by 100mm wide and 600mm high.
     
  8. Manic

    Manic Moderator

    Joined:
    12 Mar 2009
    Posts:
    3,313
    Likes Received:
    58
    Location:
    Johannesburg, Edenvale
    I don't think you can include the top of a tank as a view. If you have any water movement in the tank the surface will be rippled and you can't really see through it, at least in my tank you cant, unless you turn all the pumps off.
     
  9. AfricaOffroad

    AfricaOffroad

    Joined:
    12 Mar 2010
    Posts:
    1,696
    Likes Received:
    35
    Location:
    Ballito, KZN
    I assume in your last sentence you mean:
    "Having said that, the pressure will be no different to a tank that is 2m long by 100mm wide and 600mm high"

    Force = Pressure x Area
     
  10. Manic

    Manic Moderator

    Joined:
    12 Mar 2009
    Posts:
    3,313
    Likes Received:
    58
    Location:
    Johannesburg, Edenvale
    The area of a 2m cube that is 600mm high has the same area as one of the panels on a 2m long tank that is 600mm high. So the force will be the same. The thing is that the silicon joint supports the force of two panels, thats were a 2m cube has a lot more force trying to pull the silicon joint apart.
     
  11. leslie hempel

    leslie hempel Moderator MASA Contributor

    Joined:
    7 May 2007
    Posts:
    14,543
    Likes Received:
    285
    Location:
    Gonubie East London
    can i just mention you will need a reinforced concrete slap under they tank, i had a friend out at kidds beach with exactly that size tank when he drained and removed it (left the hobby), the tiles in the surrounding areas popped up.

    they were laid while the tank was full and the release of pressure on the slab did all sorts of funny things

    dont underestimate the weight thats all im saying :)
     
  12. HenkHugo

    HenkHugo

    Joined:
    10 May 2007
    Posts:
    3,629
    Likes Received:
    29
    Location:
    Cape Town
    2.4tons of water - eina
     
  13. mariusmeyer

    mariusmeyer

    Joined:
    7 Jul 2009
    Posts:
    3,054
    Likes Received:
    210
    Location:
    Jukskei Park, JHB
    Thats an awesome size for a tank, just going to be a pain in the ass when you have to do something in the middle of the tank.
     
  14. leslie hempel

    leslie hempel Moderator MASA Contributor

    Joined:
    7 May 2007
    Posts:
    14,543
    Likes Received:
    285
    Location:
    Gonubie East London
    im sure it will all be worth it :lol:
     
  15. Broder

    Broder Mudshark

    Joined:
    13 Sep 2007
    Posts:
    2,087
    Likes Received:
    32
    Location:
    East London
    What was the thickness of glass used and how was it braced Les?
    Do you know what the stand was made of?
     
  16. RiaanP

    RiaanP Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,163
    Likes Received:
    1,231
    Location:
    Centurion
    Sounds like Shaun's dream in the making....

    Check out his story on big tanks, and big stands.
     
  17. sweetnsour

    sweetnsour

    Joined:
    15 Jul 2009
    Posts:
    1,728
    Likes Received:
    8
    Location:
    JHB East Rand
    it will be an amazing tank that size for sure, for bracing why not add strips of glass at the corners , it will give the corners strength aswell as increasing the silicones surface area
     
  18. leslie hempel

    leslie hempel Moderator MASA Contributor

    Joined:
    7 May 2007
    Posts:
    14,543
    Likes Received:
    285
    Location:
    Gonubie East London
    concrete stand

    10mm glass. there were pillars on each corner and the glass was recessed into them.
     
  19. robvdv

    robvdv

    Joined:
    22 Jun 2007
    Posts:
    798
    Likes Received:
    16
    Location:
    Noordhoek, Cape Town
    Yeah, +1.

    My tank isn't that applicable to your tank. Very different set of problems. Your decisions are probably "rimless or braced" and "how thick should I make the glass". If you have the budget, rimless 19mm LIG would be good. Just check the numbers with the experienced guys (Bob etc.) and with some online calculators.

    Good silicone should be fine. To calculate this accurately, look up the shear strength of the silicone you want to use and then calculate the outward pressure on each panel. There's more subtlety to it than that, (as AOR says, the bulk of the force will be at the top of the joint) but it'll give you a guideline.

    Just took a look at the Dow Corning 895 product spec. It says it has a maximum allowable shear of 140kPa. This is around 1.5kg per square cm, or around 150kg per joint for your tank if you use 19mm with no fillet on your joint. This seems very conservative to me.

    I remember Calfo used triangular corners in his greenhouse tanks, so that might work for you.
     
Recent Posts

Loading...
Similar Threads - Advice needed setting Forum Date
Advice Needed for Sale of Tank General Discussions and Advice 16 Nov 2016
Importing an LED unit - Advice needed Technology 12 Sep 2016
Advice needed.What could this be? Quarantine Tanks, sick fish, QT corals 27 Jul 2016
First timer help and advice needed Beginner Discussions 26 Apr 2016
Brown algea advice needed.. Advanced Topics 8 Apr 2016
Advice needed Beginner Discussions 3 Dec 2015
Nano advice needed Biological/Natural Filtration and Deep Sand Beds 1 Oct 2015