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  • Flashback arresters

    Hi, I recently got a Micro oxy/acetylene torch, And was wondering: Where do I find flashback arresters that connect to the regulators? Since theres nowhere to connect them beween the torch and hoses (crimped on hoses)
    Do I even need them?
    Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.

  • #2
    Always!!

    I can only presume that they meet all the legal requirements of Canada and the USA, so, that being the case, the legal answer will be no ie you do do have to have them fitted.

    I bought a new industrial O/A set (heating and cutting) as well as new made in the USA "Dillon"/"Cobra" O/A torch set and both sets came with flash-back arrestors.

    I am pretty sure that are compulsory for industrial use here.

    I ALWAYS have arrestors on my O/A sets - fitted at the regulator ends of the hoses - as I've seen what a flash-back without arrestors fitted can do. It didn't "explode" the regulators or the bottles but it made a big mess of the hoses.

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    • #3
      Yea but where do you get that kind and how do you know your getting that kind? I just bought some generic ones and the 'flow arrows' on them show that they can only be used on the torch end...
      Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.

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      • #4
        Get arrested

        Sorry - my careless mistake - as I meant and should have said to put the arrestors on the torch and connect the hoses to the arrestors as they will protect the hoses too.

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        • #5
          Airgas has Western brand rebranded for their Randor brand.
          They have torch style and they also have Regulator adapter style. Neither style are cheap
          They have sets of both or each.
          #64003942 (FA-30) set

          #FA-130P Oxygen
          #FA-230P Fuel gas

          I'm sure that Praxair, or your LWS has them or can get them.
          Western is the company that seems to make all of them. they also make the quick couplers. Also not cheap
          Glen
          Been there, probably broke it, doing that!
          I am not a lawyer, and never played one on TV!
          All the usual and standard disclaimers apply. Do not try this at home, use only as directed, No warranties express or implied, for the intended use or the suggested uses, Wear safety glasses, closed course, professionals only

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          • #6
            Ii am guessing he has something like the Smith micro torch. They have little hoses that go to the handles.

            One problem you might run into is a lot of the flashbacks incorporate check valves in them and at the low pressures and flows these little torches the check valve may cause some issues. I have one of the smiths myself with its own little MC and 20cuft bottle set.

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            • #7
              I don't know what the regulations are in other places but in Canada (business any way) you are required to have flashback arrestors on the torch and the regulators as well as a blow out preventor (shuts off the O2 regulator if the hose is cut) on the O2 bottle, these can be a combined unit with the regulator flashback arrestors.

              As far as a home shop it may not be required but it is a good idea for the same reason it is requried in a commercial shop, Oxy/acet can be very dangerous.
              The shortest distance between two points is a circle of infinite diameter.

              Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

              Southwestern Ontario. Canada

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              • #8
                Mine are at the torch end, I am assuming that is correct. That seems to be the most logical place, it would make more sense to have flachbacks on both ends of the hose.

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                • #9
                  O/A flashback arrestors

                  I have them on both ends of the hose - just after the regulators and just before the torch handle.

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                  • #10
                    Flash back Arresters

                    Yes , you should have them for your own safety.
                    Just call your local welding supply. they will set you up with what you require. and they will be able to inform you of exactly what is required by law.

                    Paul
                    Paul

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                    • #11
                      I'd, first, make sure the torch doesn't have built-in flashback arrestors. I doubt yours does, but some regular torches do.

                      If you need to install arrestors, do it at the regulator end. Not only because the hose is crimped at the handle, but also because you want to keep your micro torch being "micro" (light and small).
                      Mike
                      WI/IL border, USA

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                      • #12
                        Cobra

                        Originally posted by macona
                        Ii am guessing he has something like the Smith micro torch. They have little hoses that go to the handles.

                        One problem you might run into is a lot of the flashbacks incorporate check valves in them and at the low pressures and flows these little torches the check valve may cause some issues. I have one of the smiths myself with its own little MC and 20cuft bottle set.
                        Good comment.

                        My "Cobra" aka "Dillon" O/A set runs are 4 psi (no - not a typo) and my anti-flash-back arrestors work fine and I have no gas-supply/flow problems at all.

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                        • #13
                          The bigger problem with the smith little torch, Is with some of the heavier duty larger, two stage fuel/oxy regulators that don't operate well under low pressure and small volumes of gas flow. They tend to flame out all the time, as the movement of the diaphragms is too fast or great



                          Smith little torch, with adapters and western quick couplers came in Randor packaging.
                          Glen
                          Been there, probably broke it, doing that!
                          I am not a lawyer, and never played one on TV!
                          All the usual and standard disclaimers apply. Do not try this at home, use only as directed, No warranties express or implied, for the intended use or the suggested uses, Wear safety glasses, closed course, professionals only

                          Comment


                          • #14
                            I bought mine through Merriam Graves, now Airgas. Good to have. Six gas welding set-ups at our facility, all protected, one started the meltdown, the flashback arrestor worked. Hose non-functional, but the purpose met.
                            CCBW, MAH

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                            • #15
                              I got a set of these several years ago. They screw onto the regulators and then the hoses screw onto the arrestors.


                              http://cgi.ebay.com/FLASHBACK-ARREST...item4aa44ef3eb

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