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Flashback arrestors, what to use.

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  • Handy560
    started a topic Flashback arrestors, what to use.

    Flashback arrestors, what to use.

    Hi and thanks for taking the time...

    I don't do too much torch work, but I do have a portable set that really comes in handy. I have often thought to add flashback arrestors or backflow valves. I assume the arrestors at the torch handle would add the greatest margin of safety but may be clumsy with the added couple inches to the overall torch length, especially when the idea is to have a small compact torch. Are the regulator mounted ones adequate?

    I do try to practice safe handling, lighting, purging but because I do not use the set often I always need to check back for correct pressure settings etc. and I think the extra safety would be smart.

    Can you guys with the hands on experience let me know what makes the most practical sense for my limited use.

    Learning something new here everyday.

    Thanks

    John

  • DDA52
    replied
    If MSHA says it, then OSHA does as well...birds of a feather and all the rot.

    I have seen acet regs that went boom, too. Nasty little grenade going off there.

    Leave a comment:


  • J hall
    replied
    Read this.

    http://www.msha.gov/stakeholderbp/be...nacetylene.pdf
    In my world, if MHSA says it then that is the end of the debate.

    FWIW, Smith has an internal flashback arrestor in the head.

    Leave a comment:


  • Fishy Jim
    replied
    I have arrestors on one of my torches and none on the other.

    Why? Cause they came with one and not with the other.

    Why not use them? Because there's nothing that could happen if you had a flashback short of maybe blowing out a hose. I've never had that happen, and I rarely use the O/A rig anymore anyway.

    If they were so necessary, they'd be built into the torch body and it would be required by the feds.

    Smith doesn't even say they're needed:
    http://enet.smithequipment.com/public/docs/BDBinDoc.asp?ID={ED220DF6-8247-4F50-BE48-24855652BF12**&DownLoad=0

    Leave a comment:


  • 84ZMike
    replied
    Originally posted by 84ZMike View Post
    ............so explain to me what you use and why......so that we can all learn.....I'm not saying my way is the best / only way to do it but I feel better with my set up and it works just fine for me.
    Post # 16.... after reading it I see how you could have passed it over....so what do you use and why?

    Leave a comment:


  • Fishy Jim
    replied
    Where was I asked a question that hasn't been answered?

    Leave a comment:


  • 84ZMike
    replied
    Fishy....how /why is i that you want to run your mouth but when asked a question relevant to the topic you have nothing to say ?

    Leave a comment:


  • Handy560
    replied
    Backup...

    I think the biggest danger aside from the obvious is one gas backing up into the other line like if the tip was clogged and both valves were open. Check valves in the torch should at least prevent that.

    Leave a comment:


  • J hall
    replied
    So FJ,
    are you saying that there is no need for flashback arresters?
    That's kind of what it sounds like.

    As for me, but I'm a dumb hack so don't take me too serious, I do have arresters at the regulators and the torch..
    Better safe than sorry, I enjoy life with all my body parts

    Leave a comment:


  • joebass
    replied
    Better watchout, he'll get ya banned!!!!

    Leave a comment:


  • KB Fabrications
    replied
    Uhmmmmmm, I wouldn't argue with fishy. He can make a bandsaw out of old volkswagon wheels in his parents basement (or he's at least a couple of years into the process) so it is pretty obvious that his intellect is far superior than anyone here.

    Leave a comment:


  • burninbriar
    replied
    I think where the most prevalent danger is, when you shut the torches down and you have a small leak somewhere along the line. The gas in you're system will try to equalize with the outside atmosphere and at some point you can end up with a volatile mix in the system. You could get flammable gas exiting a leak on the flammable side and entering a leak on the oxygen side in its attempt to equalize and therefore both sides could become volatile.One place this can happen is at the torch valves, if both are faulty. The safety valves will help contain a hazardous situation to to the area between the safety valves. In other words, the gages,hoses, and torch are all separated.
    I don't believe it is recommended to use safety valves at the regulator and torch just so they can sell unnecessary equipment.
    It is true though that the tank itself can't burn internally without fuel and oxygen and since they are always under pressure, the volatile mix would have to be present when the tank is filled.

    Leave a comment:


  • 84ZMike
    replied
    OK then you take an lp tank run it down very low (5psi) open the valve and light it.....stand there and call me when the flame goes out.....it will burn into the tank and yes it will go boom............so explain to me what you use and why......so that we can all learn.....I'm not saying my way is the best / only way to do it but I feel better with my set up and it works just fine for me.

    Leave a comment:


  • Fishy Jim
    replied
    So let me get this straight -

    You run your tank empty, and when empty the flame might finally burn back into the tank (where there is no fuel, and your O2 on its own will not burn itself) and this is going to make a BOOM how?

    Same thing with your LP. Your tank burns down to 0psi and is now empty enough to swap out. Somewhere along the line this still has enough oxygen INSIDE the tank (how did the O2 get in there?) to go BOOM when it no longer has any psi...

    Neither situation works.

    You're a genius.

    Leave a comment:


  • 84ZMike
    replied
    Correct as long as there is pressure in the tank the fire will stay on the out side burning at the rate the regs let it.....the problem is I like to run my tanks empty before I swap them....(not acetylene as I run LP)....so if I was to cut a hose and the tank was on it's last drop well not a good thing......so if you only use flashbacks at the torch then you run the risk of fire burning back to the reg. then that 2000 psi will be burning as well as propelling your tank....hopeful for the rest of us you will be the only one injured

    Leave a comment:

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