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  1. #1
    Join Date
    Sep 2006
    Posts
    17

    Default welding an air tank?

    Hey ... this probably sounds like a dumb idea, but I was thinking of welding an air tank out of 1/8" steel.

    That would be much thicker than store-bought tanks, and I would even be able to treat the inside with rust-prevention compound -- like the rust-proofing they use on cars.

    I think to bend the steel into a cylinder would be very difficult, so the best way to do it would be a 16 X 16 X 48" box, which would be about 53 gallons.

    I know that a square box isn't as strong as a cylinder, but with 1/8" steel, it should be overkill, right?

    What do you think? Criticism and suggestions are welcome!

  2. #2
    Join Date
    Sep 2006
    Location
    Wheeling
    Posts
    169

    Default

    The variables are based upon your skills and your ability to test the stenght of the tank.

    But by the time you you have the steel and welding equipment together, it maybe cheap to buy a used tank.

    Just my thoughts,

    Jerry

  3. #3
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,898

    Cool

    I welded up a tank 25 years ago to use in a wood boiler, i made it from sheet 1/8" plate. It was 24x24x3" thick. I pressured it up with air to test it and the sides pushed out like a big fluffy pillow, now it is 6" wide in the middle. Needless to say i didn't use it but it didn't leak either.
    This is just my opinion, i would not build a tank today because of the liability if something did happen even way years down the road unless you are certified for pressure vessle work...Bob
    New tanks aren't that expensive from even Graingers.
    http://www.mcmaster.com/ PAGE 891 Air Tanks
    Last edited by aametalmaster; 09-18-2006 at 06:46 PM.
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  4. #4
    Join Date
    Sep 2006
    Posts
    17

    Default

    Ok ... that was a bad idea ... my apologies :-)

  5. #5
    Join Date
    Aug 2006
    Location
    Raymore Missouri
    Posts
    1,920

    Default

    If you're thinking of making your tank to save money,........don't. But if you need a custom size then try it if your welding skills are up to par. If it is a square and you don't want it to pillow out maybe you could put a rod through
    it and weld the ends or just use heavier plate. I would restrict this idea to small tanks like on a motorcycle or small project. Tank failure danger would probably be in proportion to its size. Persons using old freon tanks and such
    being discouraged is because of the internal rusting and weakening of the tank from moisture from compressing moist air. The tanks are capable of holding pressure greater than most home shop air systems plus they have a pressure safety on them. What will go into the tank and at what pressure is the key issue. I would much rather be around a small tank that failed than
    a large say 80 gal that burst. There is a lot of kinetic energy there. Be careful.

  6. #6
    Join Date
    Sep 2006
    Location
    Wichita Falls, Tx
    Posts
    177

    Default

    Quote Originally Posted by monte55 View Post
    I would much rather be around a small tank that failed than a large say 80 gal that burst. There is a lot of kinetic energy there. Be careful.
    I would not want to be around ANY air tank that ruptures. Have you seen pics of then after that exploded? Plus they can throw shrapnel when they explode.
    Heres some pics of one. Looks like it rusted out then went KABOOM
    http://www.doli.state.mn.us/airtank.html

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