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Anyone Ever Built an Air Tank?

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  • Anyone Ever Built an Air Tank?

    I'm in the process of getting everything together for a air compressor, already have a large Ingersoll Rand pump and have found a source for the motor. I can't find a decent tank near home. I do have some natural gas line pipe that is 30" od, 3/8" wall and a friend has a sheetmetal shop that can cut the ends (3/8") on his plasma cutter. Has anyone ever done this? I'm not worried about the welds, but is there anything else I need to look at?

    Thanks, Justin

  • #2
    I never heard of anyone that has built their own air compressor but considering the pressure that is going to be in the tank, (30" WOW) you may want to reconsider. I did hear of the older tanks (50's style) blowing up on guys taking their leg off or worse.
    Ken

    What else is there besides welding and riding. Besides that

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    • #3
      Originally posted by Iron Head
      Make sure you dome those ends!
      Can I buy domed ends?

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      • #4
        Buy a tank. You'll live longer!

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        • #5
          Originally posted by KEENAVV View Post
          Buy a tank. You'll live longer!
          You're probably right, I've been looking for a while. Shipping is outrageous on these things.

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          • #6
            Originally posted by KEENAVV View Post
            Buy a tank. You'll live longer!
            I second that. 30 inch end plate at 120 PSI is 84,823 total pounds of force or just over 42 tons. That's 900 pounds per linear inch of weld. No thanks I'd rather have that little tag on the side of the tank say it's been tested and certified. because if it does fail for any reason your insurance will not pay.
            and that's the least of your worries
            Miller Syncrowave 200 W/Radiator 1A & water cooled torch
            Millermatic 252 on the wish list
            Bridgeport Mill W/ 2 axis CNC control
            South bend lathe 10LX40
            K.O. Lee surface grinder 6X18
            Over 20 years as a Machinist Toolmaker
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            • #7
              I also would buy a tank. Without the ASME stamp on the tank you are asking for trouble someday...Bob
              Bob Wright

              Spool Gun conversion. How To Do It. Below.
              http://www.millerwelds.com/resources...php?albumid=48

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              • #8
                Originally posted by Iron Head
                Iíll bet by the time you factor in the cost of the domes + the shipping, a replacement air compressor tank will be more appealing.
                One cheap prosthetic alone is close to $10,000 let alone the pain & suffering. I among many others on this board would hate to see a fellow welder get hurt trying to save a couple dollars.
                Ken

                What else is there besides welding and riding. Besides that

                Miller Thunderbolt XL 300/200 AC/DC
                Hobart Handler 187
                Dewalt Chop Saw
                4" Air Grinder
                Die Grinder
                Rigid Drill Press
                Kellogg 10hp Air Compressor


                2009 FXDC

                Comment


                • #9
                  I agree with most guys here, generally this is not a good idea, scares me to think of some of the stuff I did when I was a kid,, and then some.

                  Comment


                  • #10
                    Originally posted by KEENAVV View Post
                    Buy a tank. You'll live longer!
                    I don't understand this line of thought as SOME ONE makes the tanks?

                    Why can't Iron head or any one else that is qualified to do so make their own tank?
                    Ed Conley
                    http://www.screamingbroccoli.net/
                    MM252
                    MM211
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                    SO 2020 Bender
                    You can call me Bacchus

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                    • #11
                      Originally posted by Broccoli1 View Post
                      I don't understand this line of thought as SOME ONE makes the tanks?

                      Why can't Iron head or any one else that is qualified to do so make their own tank?
                      Check the requirements necessary for a high pres. welding cert.

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                      • #12
                        Originally posted by KEENAVV View Post
                        Check the requirements necessary for a high pres. welding cert.
                        As long as the person fabricating the Tank has the certs, what would be the problem?
                        Ed Conley
                        http://www.screamingbroccoli.net/
                        MM252
                        MM211
                        Passport Plus w/Spool Gun
                        TA185
                        Miller 125c Plasma 120v
                        O/A set
                        SO 2020 Bender
                        You can call me Bacchus

                        Comment


                        • #13
                          i think the problem is that the people who make the tanks, make hundreds and thousands of them. they have experience, empirical testing and certs. To make just one, you don't get any of that. I'd buy it so you can get the experience and quality of the above mentioned. Same reason some one who isn't an experienced welder shouldn't be doing critical work, and should pay a qualified person to do so, instead of suffering the learning curve for one job.
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                          • #14
                            Originally posted by Broccoli1 View Post
                            As long as the person fabricating the Tank has the certs, what would be the problem?
                            It isn't just the weld job itself... It is the design process, material verification, NDE On the finished product, and about 50 other things. The risk is much greater than the (possibly nonexistant) cost saving. The risk may not show for several years.

                            For examlpe, a minor design issue led to some failures: http://www.cpsc.gov/cpscpub/prerel/prhtml02/02108.html

                            To get an idea of the energy involved,
                            http://www.railpictures.net/viewphoto.php?id=176187. The tanks on this locomotive arn't really that big. Well, weren't. Note the bent running board. The channel at the edge was maybe 4", maybe 6". The doors and engine compartment structure were also bent up (look at the roof... it is humped).

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                            • #15
                              Originally posted by Iron Head
                              Better yet, hydraulic cylinders, steam lines, on and on and on.
                              Not saying you can't. Liability is one issue. And I'm not referring to damage to your own home how about the guy next door. If you house catches fire that tank if pressurized and no safety valve will end up a couple of zip codes away. Same goes for hydraulic cylinders. Are you willing to bet your life on your welds. Training, experience, those are the qualities of the guy i want welding my steam lines, hydro cylinders, and air receivers. But then when you take into consideration cost of materials and fab time. Along with learning how and why the tanks are designed the way the are. Add in the threaded bung fittings and safety valve it starts to add up. and to me it just ain't worth it. Oh did I mention I'm a cheep SOB too. and I still wouldn't make an air tank that big even at half the cost of new.
                              Miller Syncrowave 200 W/Radiator 1A & water cooled torch
                              Millermatic 252 on the wish list
                              Bridgeport Mill W/ 2 axis CNC control
                              South bend lathe 10LX40
                              K.O. Lee surface grinder 6X18
                              Over 20 years as a Machinist Toolmaker
                              A TWO CAR garage full of tools and a fridge full of beer
                              Auto shades are for rookies
                              www.KLStottlemyer.com

                              Comment

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