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  • acetylene thread

    i forget, what thread does an acetylene bottle have?

  • #2
    Are you speaking of the cap or the valve, or the valve into tank?

    Comment


    • #3
      Depends, if its female thread on the cylinder then its CGA 510. If its male threads on the cylinder then its CGA 300.

      Note this is for larger cylinders not the dinky little "B" or "MC" size used by HVAC techs.
      Mike
      Central Ohio, USA

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      • #4
        im talking about where the gerulator goes on. i need a 3/4 rh female pipe thread on it for an oxygen bottle and wondered if this or similar would fit:

        https://www.ebay.ch/itm/Druckmindere....c100667.m2042

        i asked them and of course they said it was for both (acetylene and oxygen).

        i looked at some pictures and now im totally confused. maybe this is different from place to place.

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        • #5
          Ok, Oxygen is CGA 540 thread. ****Let me be very very clear, regulators are NOT interchangeable!**** They are this way for very good reason... I will quote Lincoln: "For instance, if a used acetylene regulator were allowed to be assembled to a full oxygen cylinder, the result would be a catastrophic fire/explosion with the possibility of severe injuries and/or death to personnel in close proximity."

          https://www.harrisproductsgroup.com/...ead-types.aspx
          https://www.cganet.com/home-oxygen-safety/
          Mike
          Central Ohio, USA

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          • #6
            thanks, my suspicion was correct, the threads are different in the u.s.:

            https://www.ebay.de/itm/Gewindeadapt...-/132651163933

            i better ask this somwhere else, unless a european member chimes in.

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            • #7
              Threads aside what I was trying to convey is that any regulator used for oxygen must be designed specifically for oxygen or very bad things can happen. Just be careful.
              Mike
              Central Ohio, USA

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              • #8
                Also know that propane and acetylene share the same CGA connection, 510 but an LP regulator should NEVER be used on acetylene because LP is safe over 15psi, acetylene is not.

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                • #9
                  Originally posted by dian View Post
                  thanks, my suspicion was correct, the threads are different in the u.s.:

                  https://www.ebay.de/itm/Gewindeadapt...-/132651163933

                  i better ask this somwhere else, unless a european member chimes in.
                  Gas Bottle Threads vary even here in Europe. Finland seem to use different threads compared to germany for example. You probably have choice of German and French standards..
                  Location: Helsinki, Finland, Europe

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                  • #10
                    https://www.tedpella.com/company_htm...onnections.htm
                    Location: Helsinki, Finland, Europe

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                    • #11
                      thanks. i bookmarked it, so i might be smarter next time. although you cant be really be smart when dealing with cn.

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                      • #12
                        Originally posted by dian View Post
                        thanks, my suspicion was correct, the threads are different in the u.s.:

                        https://www.ebay.de/itm/Gewindeadapt...-/132651163933

                        i better ask this somwhere else, unless a european member chimes in.
                        Acetylene is left hand thread.
                        If that adapter is to go from right to left or vice versa it should be outlawed immediately!
                        Len

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                        • #13
                          Originally posted by QSIMDO View Post

                          Acetylene is left hand thread.
                          If that adapter is to go from right to left or vice versa it should be outlawed immediately!
                          510 is left hand, 300 is right hand.
                          hardly will 300 be outlawed.

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                          • #14
                            Originally posted by BigMike782 View Post
                            510 is left hand, 300 is right hand.
                            hardly will 300 be outlawed.
                            Brain fade.
                            Len

                            Comment


                            • #15
                              Originally posted by Ohio Mike View Post
                              Ok, Oxygen is CGA 540 thread. ****Let me be very very clear, regulators are NOT interchangeable!**** They are this way for very good reason... I will quote Lincoln: "For instance, if a used acetylene regulator were allowed to be assembled to a full oxygen cylinder, the result would be a catastrophic fire/explosion with the possibility of severe injuries and/or death to personnel in close proximity."

                              https://www.harrisproductsgroup.com/...ead-types.aspx
                              https://www.cganet.com/home-oxygen-safety/
                              In my past life as a medical gas instruction/installer I had occasion to rebuild some Airco 2 stage regulators. I got parts from SealSeat in California. I don't know if they still sell retail, but they did. The internal parts are identical for all the gases... insofar as they all have the same part numbers. Same nylon high pressure seats and the 'rubber diaphragm are the same. Different springs for low pressure fuels and high pressure gases. This not to say that the OP's statement about mixing oxygen and fuel gas would not be dangerous.. it certainly would. Only referring to the gas compatibility with internal bits of the regulator.

                              As far as the danger of 15psi for acetylene, the gas is in the regulator is at full cylinder pressure (some 200 psi or so) without being dissolved in acetone. I love a mystery :>) I wonder if the 15psi bit came from the early times of compressed gases, perhaps contamination of the gas led to instability issues.
                              paul
                              ARS W9PCS

                              Esto Vigilans

                              Remember, just because you can doesn't mean you should...
                              but you may have to

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