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Breathing oxygen through scuba regulator

Discussion in 'General Scuba Equipment Discussions' started by jbuw, Jun 4, 2019.

  1. Graveyarddiver

    Graveyarddiver Registered

    # of Dives: 200 - 499
    Location: North Carolina
    An adaptor is available to put your scuba reg on an oxygen cylinder.

    Personally I have a fill whip, and an account at my local “AirGas” industrial gas supplier, I get aviation grade oxygen delivered to my house at the beginning of every dive season, so I can get O2 quickly and do partial pressure fills.

    As for regulators, a common misconception is that of it’s your O2 reg, it can’t be used for air. As long as the air your running through that reg is clean, filtered, and free of impurities, your clear to use it for O2 again. Because most if not all dive shops are selling nitric and blending it, their systems are entirely O2 clean, and capable of supporting partial pressure fills. There should be no issues going from air to O2 with your reg. As long as you have ensured it’s been O2 cleaned m, and all lubricants and O rings are O2 compatible
  2. G9

    G9 Solo Diver

    # of Dives: 2,500 - 4,999
    Location: Tasmania
    It's a bit unclear, but I think you are asking how to fit a scuba regulator to an oxygen tank. You have seen that they don't fit together! The oxygen tank has what is called a "Pin-Index" fitting and the scuba tank has a DIN fitting. I'm assuming you have access to oxygen tanks from your local friendly medical establishment and you'd like to get at that oxygen. I see you are in Andaman Islands and I guess you don't have local access to lots of technological support.

    You could get a customised device made to go from the pin-index to female DIN. Try Steve Fordyce at tfmengineering.com.au but it will cost you quite a bit and I don't think it's a good idea to take this underwater.

    Your other (better in my opinion) option is to breathe from a scuba cylinder of oxygen. Many divers do! (Other posters have explained you can put oxygen in scuba tanks.) Steve will sell you a transfer whip with an adapter to fit the pin-index at one end and a male DIN fitting at the other. Get a BIG, full oxygen tank and a small (5 litre, 7 litre) scuba cylinder. Connect and fill your scuba tank. The oxygen cylinder will be around 180 bar, so you'll get around 160 bar in your scuba tank. That will give you quite a lot of breathing time. Even just doing your final safety stop on pure oxygen helps destroy those nasty little bubbles that form on EVERY dive.

    A few warnings. Clean the scuba tank and scuba regulators - ask Google how. Make sure all the o-rings in your regulators are viton, but better still buy a dedicated oxygen regulator (see DiveRite). Don't exceed Maximum Oxygen Depth (6 metres) or you'll fry your central nervous system. Do a deco course. Do a nitrox course. Transfer the oxygen from tank to tank SLOWLY.

    You can even make your own nitrox using this method.
    Once the pressure in the big oxygen tank is too low, return it to your medical friend for sick people to use.
    FreeFlyFreak likes this.
  3. Bob DBF

    Bob DBF Solo Diver

    # of Dives: I just don't log dives
    Location: NorCal
    As a vintage diver, at times I miss the taste of the crappy air. All I can get around me now is the "hyper pure air", which tastes rather sterile. On the other hand my chances of getting a faint taste of oil and being put to sleep whilst diving go down.

    dead dog likes this.
  4. davehicks

    davehicks ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Seattle
    Maybe I can hook you up with my local supplier of Artesinal Organic Mineral Air, with partiality ignited hydrocarbon flavoring.
    Bob DBF and Fibonacci like this.
  5. Fibonacci

    Fibonacci Contributor

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    Thorough O2 cleaning is important even on Nitrox!
    Look at what happened to an uncleaned Sea Hornet MK5 that must have been connected to 36% Nitrox :eek:

    Ignited all the lubricant inside and gas jetted out each end, under the HP seat degrading 30% of it and then out via the piston stem o-ring.

    No wonder it wouldn't hold a steady IP :D

    Sea Hornet MK5 oxygen damage.jpeg
  6. BRT

    BRT not a soft touch

    "Must have been"? Or was?
  7. Fibonacci

    Fibonacci Contributor

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    Purchased as part of a bundle of ex-Royal Australian Navy regs (stamped RAN and serialised) so I have no actual history of past abuse... it's also possible it was part of a gas blending error?
  8. BRT

    BRT not a soft touch

    I certainly don't know, but I would think it much more likely it happened with pure O2 or a high concentration than with 36%
    Fibonacci likes this.
  9. dead dog

    dead dog Solo Diver

    # of Dives: 2,500 - 4,999
    Location: SoCal via Pittsburgh, Pa.
    Oh yeah, like when back in the '50s when some dive shops added a drop or two of Mint to the filter system to get that fresh minty taste of air.
    Bob DBF likes this.

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