Water Tank Platform
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  1. #1
    Join Date
    Jul 2010
    Location
    Santa Anna, TX
    Posts
    11

    Water Tank Platform

    Hello all,

    I am considering welding a small tower/platform (about 5' tall) for a 1500 gal. poly water tank. The tank is around 8' in diameter and around 5' tall. The tank full of water should weigh somewhere around 12500 lbs. I would like to build a majority of the frame out oilfield pipe maybe 2 7/8" or larger if need be. The posts could be 2 7/8" on a 4' with girder like cross pieces made of i-beams with purlins placed on top of the i-beam spaced maybe 12' O.C. and sucker rod x-type bracing. How many posts would y'all recommend and what are your thoughts on the the rest of the design and what sizes would you recommend for the i-beams and the purlins?

    Thanks,
    Kelly

  2. #2
    Join Date
    Jul 2010
    Location
    Santa Anna, TX
    Posts
    11

    Re: Water Tank Platform

    Hi,

    Here is a quick drawing I made to give everyone a better idea of what I'm talking about. I hope you can read my writing.


    Thanks,
    Kelly

  3. #3
    Join Date
    Feb 2009
    Location
    new york
    Posts
    1,279

    Re: Water Tank Platform

    thats alot of weight to guess on a structure..I would have it engineered or get specks on one already built..I dont know much about oil field pipe but many comments on the forum say its not very weldable, and lateral support is needed so the whole platform doesnt twist or sway..so trying to weld those angle supports could pose a problem..
    Of all the things I lost I miss my mind the most...

  4. #4
    Join Date
    Feb 2009
    Location
    Florida
    Posts
    192

    Re: Water Tank Platform

    My calculations show an 8ftx5ft cylinder full of water to weigh closer to 15600lbs, not including the weight of the cylinder itself (at least a couple hundred pounds) and brackets/supports to keep it in place. I think you're underestimating the weight to be carried.

  5. #5
    Join Date
    Jul 2010
    Location
    Santa Anna, TX
    Posts
    11

    Re: Water Tank Platform

    viper522,

    I am guessing at the size of the tank, however that tank is a 1500 gal. tank. I understand water weighs 8.34 lbs./gal, so 1,500x8.34=12,510 lbs+ let's say 400lbs for the tank = 12,910lbs. So it should weigh around 13,000lbs.

    Thanks,
    Kelly

  6. #6
    Join Date
    Nov 2007
    Location
    Leonville, Louisiana
    Posts
    367

    Re: Water Tank Platform

    Agrarian, myself and another welder made one almost identical to your drawing for a hunting camp a few years back, but we put it on a skid and we used 4" sch 40 pipe for everything and it was 8ft. tall. For the floor for the tank to sit on, we used galvanized grating.
    If it was me I would go with 4" instead of the 2 7/8".

  7. #7
    Join Date
    Jan 2011
    Location
    Australia
    Posts
    5,313

    Re: Water Tank Platform

    I recently built one for a customer here in Aussie to similar design and, as it was a poly tank, the manufacturer recommended a solid base for the tank to sit on, so I used 3mm gal sheet.
    The problem stems from the tank tending to sink through the slats and pulling the top and side out of shape.
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  8. #8
    Join Date
    Jul 2010
    Location
    Santa Anna, TX
    Posts
    11

    Re: Water Tank Platform

    cajun welder:

    So you recommend 4" instead of 2 7/8", that's probably a good idea. With nine legs, each leg ought to support about 1,444lbs! I think I can get some 4" oilfield pipe. How many posts did you use on the one you built.

    Mick120:

    I didn't mention this in my previous posts, but I was planning on putting down at least 3/4" plywood or maybe some sheet or plate steel. How many posts did you use and what size pipe did you use on the one you built?

    Thanks,
    Kelly
    AgrarianWelder

  9. #9
    Join Date
    Jan 2011
    Location
    Australia
    Posts
    5,313

    Re: Water Tank Platform

    Hi Kelly,
    The one I built was for an 8000 litre tank, posts were done in 100 x 100 x 3mm RHS, support frame slats were made in 75 x 50 x 3mm RHS.
    Probably overkill but, it was for a public building and, we didn't want any negative feedback from the local council inspectors.
    Sorry mate, just reread your question....6 posts.
    Last edited by Mick120; 07-12-2011 at 07:43 PM.
    *********************************
    CIG 320SP pulse mig
    Mitech ACDC315P
    Samson 510 CNC plasma table
    Hypertherm 85
    Etc, etc,etc.

    "You don't stop laughing when you get old....You get old when you stop laughing".

  10. #10
    Join Date
    Apr 2011
    Location
    minnesota
    Posts
    1,184

    Re: Water Tank Platform

    We have one that has 6 4" sch 40 posts arranged in a circle with 4" c channel between posts and for cross members with 3/4 teated plywood for tank to sit on. 3/8 flat on floor. Been on there 16 years no probs
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  11. #11
    Join Date
    Nov 2007
    Location
    Leonville, Louisiana
    Posts
    367

    Re: Water Tank Platform

    Agrarian, I used 8. If I don't have to work this weekend I'll try to go take some pictures and post them for you to see.

  12. #12
    Join Date
    May 2011
    Posts
    96

    Re: Water Tank Platform

    I installed 2 10,000 gallon tanks that hold sucrose and they stand at 100,000lbs full + tank + frame. The frame that came with them are only 10 - 4" sch 80 pipes, 2' tall with 3x3x1/4" angle connecting them all, sitting on 8x8x3/8" base plates. I put on a 3/8" plate over the entire thing to keep the tank from sinking.

    The biggest thing is making sure your concrete footing will support the weight especially under windy, hurricane, tornado, or whatever/wherever you are conditions. I wouldn't see why a 9 post 4" sch pipe wouldn't hold it in your drawling. 5' seems a little high for 2 7/8". I like putting a full sheet of steel underneath the tank, you know that won't wear out. Remember to make brackets to strap the tank down.

  13. #13
    Join Date
    Jan 2008
    Posts
    3,422

    Re: Water Tank Platform

    im not one to eliminate a welding project..but seems to me you could form an 8 x 8 x 5 foot block and pour 12 yards of concrete in it easier than this platform is turning out to be...

  14. #14
    Join Date
    Jul 2010
    Location
    Santa Anna, TX
    Posts
    11

    Re: Water Tank Platform

    Country Metals,

    Thanks for the info on your huge sucrose tank project. Do you think I could possibly back down to six posts based on your project?

    Here is a drawing of the proposed tower on SketchUp. Should I use 2x6" 14 ga. RHS or C-Purlins or should I use something heavier, like 11 ga. ? Do y'all think that 16" O.C. is adequate or should I make it 12" O.C? In the text in the picture I put 1/8" for the sheet metal, do y'all think the heavy expanded steel would hold up, or should I use a heavier plate steel?

    Weldbead,

    I ought to just bring in enough dirt to bring the ground up 5'. What do you think, 20-20 yards of dirt and gravel?



    Thanks,
    Kelly

  15. #15
    Join Date
    Jan 2008
    Posts
    3,422

    Re: Water Tank Platform

    i think 3/4 rod aint worth schhit in compression.hold it in your lap for all i care.

  16. #16
    Join Date
    Feb 2008
    Location
    North of Philly
    Posts
    16,009

    Re: Water Tank Platform

    Weldbead the rods are tension members in that drawing.

    AgrarianWelder I was looking at some litt the other day about how fast the new ACQ treated wood eats standard galvanized and untreated hangers. In some cases you can get serious corrosion in as little as 90 days after instalation.The newer PT wood's are especially agressive in promoting corrosion of steel even galvanized steel. Most have to be specially treated or you need to use copper or stainless to prevent corrosion. Alum, the traditional flashing for PT, is specifically not recomended because of how fast it will corrode.

    With both 1/8" steel or plywood, I'd have concerns about rain getting under the tank and then sitting and starting rot/rust. If you choose to go this route, I'd caulk that seam well with a top quality urethane caulk after filling the tank. A open design like bridge grate might be a better choice.
    .



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  17. #17
    Join Date
    Jan 2008
    Posts
    3,422

    Re: Water Tank Platform

    [QUOTE=DSW;532787]Weldbead the rods are tension members in that drawing.

    until it starts to lean..then half are in compression and dont do any bracing...

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