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Thread: Adapter to use medical tank as a scuba tank

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    RBW Member ocean20178 is an unknown quantity at this point ocean20178's Avatar
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    Adapter to use medical tank as a scuba tank

    Anyone know of an adapter that can allow a medical oxygen tank to be used as a scuba tank on a rebreather? I have a size D cylinder that I'd like to use.

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    Re: Adapter to use medical tank as a scuba tank

    Sure PIN Index yoke to DIN (f) .... Aus$90.

    Ping me and let me know where you want it and I will see if there is a dealership near you.

    regards Baz

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    RBW Member whynot? will become famous soon enough whynot? will become famous soon enough whynot? will become famous soon enough whynot? will become famous soon enough whynot?'s Avatar
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    Re: Adapter to use medical tank as a scuba tank

    There are many manufacturers that make this adapter (for transfilling etc) but be careful doing this. The pin valves aren't certified for UW use and as such may be more susceptible to corrosion. If you do decide to go this route be sure and flush the valve with fresh water thoroughly after diving.

    The other thing you will want to get is a knob for easy on/off of the valve should you need to do this UW. Or convert the cylinder to a CGA450...

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    RBW Member mdma946552 is an unknown quantity at this point mdma946552's Avatar
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    Re: Adapter to use medical tank as a scuba tank

    sorry for the stupid question but what is a cga450 google did not know

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    RBW Member caver99 is a jewel in the rough caver99 is a jewel in the rough caver99 is a jewel in the rough caver99 is a jewel in the rough caver99 is a jewel in the rough caver99 is a jewel in the rough caver99 is a jewel in the rough caver99 is a jewel in the rough caver99's Avatar
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    Re: Adapter to use medical tank as a scuba tank

    maybe you mean CGA 540 ...this is a standard O2 connection...you find pics on yahoo.de for example...

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    Re: Adapter to use medical tank as a scuba tank

    Quote Originally Posted by caver99  View Original Post
    maybe you mean CGA 540 ...this is a standard O2 connection...you find pics on yahoo.de for example...
    Neither CGA-550 (Methan, Natural Gas)or CGA-540 (?) but CGA-440 (Oxygen).

    see: http://www.stoodyind.com/Catalogs/FI...05catpg060.pdf

    Michael

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    RBW Member tbone1004 is an unknown quantity at this point tbone1004's Avatar
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    Re: Adapter to use medical tank as a scuba tank

    or just sell them and buy AL19's/3l's which are the same thing and designed for scuba use. The bigger problem you'll have is getting those medical tanks filled. In this country you can't legally get fills for a medical O2 bottle without an RX, so if you have your own fill station then great, but good luck getting them filled in California

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    Re: Adapter to use medical tank as a scuba tank

    Save your D cylinder for your "Oops-I-surfaced-bent-and-need-emergency-O2" kit. A run of the mill D bottle will almost certainly have a pin index CGA 870 medical valve. I wouldn't want to bet my life on one underwater due to the way they seal to reg (or reg adapter). The chart shows the major types of CGA gas valves (CGA = Compressed Gas Association). The CGA 450 mentioned above is a *cryogenic* (liquid) valve. Ordinary gaseous oxygen uses a CGA 540.

    Now if you DO have a CGA 540, there's a sweet little hack to use one w/ a DIN reg if it's not for life support. (I stress again, I'd *not* do this for my rig's O2 supply.)

    It just so happens that CGA 540 and DIN regulators have exactly the same thread pitch, 14 tpi, and are within about 1/100th of an inch the same outside diameter. So...., if you take a bit more than an inch of 1.125" hex brass bar and bore it thru at about a .830" diameter and then thread it at 14 tpi, you get something that looks like the picture. It screws snugly onto the CGA 540 and also accepts a DIN reg. The reg's O ring seals nicely against the face of the CGA 540 and you're in business.

    I've converted a couple of sweet little 6 cf medical O2 bottles that I've been using as my dry suit gas bottles for many years. Works great, zero leaks in all that time. BTW- that's the oldest OMS suit gas reg in captivity attached to the bottle .
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    Last edited by Skipbreather; 3rd October 2015 at 02:32.

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    RBW Member whynot? will become famous soon enough whynot? will become famous soon enough whynot? will become famous soon enough whynot? will become famous soon enough whynot?'s Avatar
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    Re: Adapter to use medical tank as a scuba tank

    Quote Originally Posted by mdma946552  View Original Post
    sorry for the stupid question but what is a cga450 google did not know

    My typo... should have been typed CGA 540...

    Attached is a picture for reference. On the left is the 540 valve (Sherwood with a burst disc) and on the right is the standard pin valve (because the reg has 2 pins that lock it in- the two small holes). Both are used as ABOVE WATER emergency O2 administration along with a few E cylinders I have. I fill these at my hangar off a K cylinder and Haskle booster and also use these when flying above 12,000 MSL; right Ken ;0
    Last edited by whynot?; 2nd October 2015 at 19:02.

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    RBW Member mdma946552 is an unknown quantity at this point mdma946552's Avatar
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    Re: Adapter to use medical tank as a scuba tank

    thanks for that

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