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Thread: Propane tank

  1. #1
    Join Date
    Nov 2006
    Location
    Benton, Pa
    Posts
    68

    Default Propane tank

    I am involved with a community project where a large volume of air pressure is required to blow an old time steam whistle.
    We are estimating we will require around 100 reserve gallons of air to make it blow.
    One of the "expirts" on the committee believes he can obtain a 200 gallon propane tank for this purpose. I questioned my ability and courage to weld a bung into this large enough to provide the required air supply. I am thinking
    2" or so.
    Anybody have any experience welding on used propane tanks, I am not sure I want to do it or allow anybody else to get hurt doing such a job.

  2. #2
    Join Date
    Mar 2007
    Posts
    511

    Default

    Here is a thread that discusses stuff to do when cutting one http://www.hobartwelders.com/mboard/...g+propane+tank
    welding...its awsome

  3. #3
    Join Date
    Mar 2007
    Location
    Deltaville, VA
    Posts
    2,239

    Default

    Copperdog,

    Not trying to be a smartazz but:

    If you have to ask the question, DON'T DO IT.

    This definitely requires more research on your part. There are procedures for flushing the tank and purging it prior to welding but, even with detectors, it's not a job for someone who's not trained in the procedures.

  4. #4
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    279

    Default

    That level guage coupl. is close to that size, isn't it.
    We use these tanks for making BBQ pits all the time. Best bet is remove all the conns. fill w/water for several days drain, you will smell the odorizer but not a problem, cut and weld.
    L*S
    Attached Images Attached Images
    Last edited by Leons2003; 07-29-2007 at 01:11 PM. Reason: added text and pic.

  5. #5
    Join Date
    Mar 2007
    Location
    Deltaville, VA
    Posts
    2,239

    Default

    Leon,

    Original poster clearly stated that the tank would remain a "pressure vessel".

    Welding on a pressure vessel is not something for the hobby welder. Requires pressure certs., which I feel if he had, he would not have posed the question in the first place.

    Just my gut feelings.

    PS By the way, nice looking cooker.

    You've got more nerve than I do. Seen and heard of too many stories where guys were trying to weld on fuel tanks. Filled them with water for several days, dumped them, and began to weld. Enough fumes had permeated the metal to create an explosive environment. If I was going to be welding on a propane tank, I'd do what you said. But, and a big but, that sucker would be purged with nitrogen to the gills before I started.

  6. #6
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,860

    Default

    I wouldn't do it. In the event of a malfunction down the road (explosion with death or injury) ANYONE who had anything to do with building it will be held liable. Whos insurance will cover you? Let a certified professional welder or shop do it. Remember welding on a propane tank can be dangerous but creating a pressure vessel is also.
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  7. #7
    Join Date
    Nov 2006
    Posts
    22

    Default Pressure vessels

    I think you're getting into a very dangerous project here. I've learned over the years that pressure vessels are not to be toyed with, and relatively low pressures like your talking about can still take a life in the event the tank ruptures and a piece of shrapnel takes someone out.

    If you guys do this, please consider buying a used or new 80-100 gallon air compressor tank and tapping into the existing bung. It'll be pressure certified and if it does rupture, you've got something to go back on, i.e.it wasn't a project built by a hobbyist that isn't certified to do that kind of work. It's not work losing everything you've ever worked for.

  8. #8
    Join Date
    Nov 2006
    Location
    Hampton, Va.
    Posts
    386

    Default DON"T DO It

    I wish my old buddy Jim Crewes was here to tell you not to do it,unfortunately Jim passed away about 10 years ago while welding on a propane tank that he filled with water . I don't know how long he had left the water in and we will never know. Please listen to the guys that have told you to do more research.

    Thank you
    Wheelchair

  9. #9
    Join Date
    Dec 2006
    Location
    Wartburg,Tn
    Posts
    575

    Default

    Yeah wat wheelchair and ever one else said Don`t do it

    Inferno Forge

    Chris

  10. #10
    Join Date
    Nov 2006
    Posts
    22

    Default Propane tank

    Hand an idea in the shower. Cruise on over to trainhorns.net and throw your question up on their board. These guys do all kinds of stuff with air and steam powered whistles, maybe they can give you some helpful advice.

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