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Thread: What kind of welder (person) do I need?

  1. #1
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    What kind of welder (person) do I need?

    Since I don't have the welding skills I need to make my next project happen I've come here to figure out how to find a welder with the skills I'm looking for. I've got a project coming up where I need to source and modify a pressure vessel about the shape of a LP holding tank, 8-10 ft long and 40-50 in diameter. I need to take one rounded end off and replace it with a flat steel plate. It needs to have various openings added to include ports for pressure gauges as well as inlet and outlet valves. The vessel needs to hold 45 lbs working pressure and withstand a structural integrity test of about twice that.

    Although I don't personally know any welders who can do this kind of work, thankfully I have enough connections I could probably locate one with a little direction. Since getting this made could end up costing $$ I'd like to find someone who does this kind of welding professionally but is open to a side job. My best guess is that boilermakers or pipe fitters would be the kind of welder who could help me out.

    Could anyone suggest how I can find a welder with these kinds of fabrication skills?

  2. #2
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    Re: What kind of welder (person) do I need?

    Start by contacting Welding Shops in your area or surrounding area.

    Give them the same parameters you listed here.

    As you have noticed this will be a specialized job since you are creating a pressure vessel.
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    Re: What kind of welder (person) do I need?

    Oh Boy, I'm gonna pop up popcorn for this one!!
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    Re: What kind of welder (person) do I need?

    Quote Originally Posted by mla2ofus View Post
    Oh Boy, I'm gonna pop up popcorn for this one!!
    I dont see this as a popcorn thread.

    he's not asking how to do it.

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    Re: What kind of welder (person) do I need?

    It would also be helpful if you make the weld procedure specification available for them to determine if they have the right certification and equipment to do this job.

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    Re: What kind of welder (person) do I need?

    Adding your location would be a good place to start finding someone.
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    Re: What kind of welder (person) do I need?

    Even with only 45 psi I think it might be dangerous with the flat end on it. Maybe cut the flat end so it sits inside and will be pushing against the weld instead of pulling on it.
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  12. #8
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    Re: What kind of welder (person) do I need?

    This is outside of my wheelhouse, but I think you're looking at two different questions. One, is how to come up with a safe design and the other is the process to make it properly. As an example, it will be different depending upon what's in the tank. A tank for liquids will have different requirements compared to a tank for gasses.
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    Re: What kind of welder (person) do I need?

    Engineering and pressure vessel liability are outside my wheelhouse too but that project should be reviewed by a certified welding engineer unless OP is appropriately qualified. There aren't a lot of flat ends on pressure vessels for structural reasons. A WPS is in order.

    Your local welding supply should have business contacts with pressure vessel weldors or firms who hire them. That kind of work has to be right and with ample safety margin or people die. So do new metal and the filler material, and appropriate players will need insurance per your jurisdiction.

    https://technoweld.com.au/2019/04/26...-you-need-one/

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  16. #10
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    Re: What kind of welder (person) do I need?

    What's the reason for the flat plate ??

    I suggest leaving the rounded caps on as is.
    Weld the flat plate to the capped end. Add square tube or pipe to secure plate to capped end. Pipe or square tube is nice to work with for the mitered fit to the cap radius.
    As for the openings, threadolets, extra heavy threaded nipples, or extra heavy steel couplings will work for what you want.
    You could use socket weld fittings too.
    If you prefer threaded, forged steel fittings are available too. Those could be back welded if needed.


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  18. #11
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    Re: What kind of welder (person) do I need?

    I do this work on a daily basis , you need an A.S.M.E. section IV certified welder. Why do you need a flat end? Unsafe , can be subject to bending stresses from internal pressure . Also is this a fired or unfired vessel I am located in Southern California.

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    Re: What kind of welder (person) do I need?

    Quote Originally Posted by mla2ofus View Post
    Even with only 45 psi I think it might be dangerous with the flat end on it.
    Leave the rounded cap on.

    Make up a cradle with a flat bottom that the tank sits into.

    I'd make it mechanical clamping so you don't' weld on the pressure vessel at all.

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  22. #13
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    Re: What kind of welder (person) do I need?

    A pressure vessel that is 50in (4.17ft) diameter and 10ft long equates to 136.4 cuft. (1020 gallon tank).
    Proper engineering and design has to be done before a welder even thinks about touching this.
    Here's one qualified fabricator:
    https://www.buckeyefabricating.com/p...essure-vessels

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  24. #14
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    Re: What kind of welder (person) do I need?

    For starters, you DON'T want a fool doing this.
    Secondly, only a fool would do this without being insured, and likely your state or city will want credentials of some sort. A redneck might make it work, every farmer with a welder will be happy to give it a shot, but if human life safety is going to be questioned go all the way & find a company able to do it right.
    An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.

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  26. #15
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    Re: What kind of welder (person) do I need?

    It takes a License for pressure vessels type of work.

    Dave

    Quote Originally Posted by toonces View Post
    Since I don't have the welding skills I need to make my next project happen I've come here to figure out how to find a welder with the skills I'm looking for. I've got a project coming up where I need to source and modify a pressure vessel about the shape of a LP holding tank, 8-10 ft long and 40-50 in diameter. I need to take one rounded end off and replace it with a flat steel plate. It needs to have various openings added to include ports for pressure gauges as well as inlet and outlet valves. The vessel needs to hold 45 lbs working pressure and withstand a structural integrity test of about twice that.

    Although I don't personally know any welders who can do this kind of work, thankfully I have enough connections I could probably locate one with a little direction. Since getting this made could end up costing $$ I'd like to find someone who does this kind of welding professionally but is open to a side job. My best guess is that boilermakers or pipe fitters would be the kind of welder who could help me out.

    Could anyone suggest how I can find a welder with these kinds of fabrication skills?

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