Oxygen cylinder adapter?

[thatguysb]

Hi, i am interested in using a medical oxygen cylinder and adapter to allow it to work with a cutting set i am planning to build for my home use.

I am planning to use it with a propane cylinder and a medical cylinder, i already have the two cylinders already and Im not located in the USA. So i can refill the medical oxygen cylinder with regular oxygen so thats not a issue.
I am not to familar with the names of these valves but from my online browsing, i ended up with a CGA 540 to CGA 870. Which would then allow me to adapt to a regular victor regulator and then to the torch set.

from this

 

[NUTTSGT]

We have a Petrogen torch set at the station. It was designed to be able to use medical grade bottles and I'd have to get a picture of what it have for fittings.

 

[rlitman]

Do you have an infinite source to medical grade oxygen, or are you just buying cheap medical grade cylinders?

Welding suppliers will not fill medical grade cylinders with yoke adapters. Too much liability, and you're supposed to need a prescription.

I suggest that you take the cylinder to your welding gas supplier, and have them replace the valve with a standard welding valve. It'll be cheaper than that stupid yoke adapter.

 

[laser3kw]

there is literally no difference in the oxygen in a medical cylinder and an industrial cylinder. To qualify that: if the fill plant uses a high standard of filling. the only thing medical cylinders may be checked for purity and maybe moisture. Of course the are also kept in nicer shape.
But to the people who use medical cylinders for cutting application, you are doing a huge disservice to the people who rely on them, You are introducing the possibility of unexpected contaminants to both the exterior and interior. Of course, as I mentioned above, if the fill plant does a good job, they should be purged correctly and cleaned up.

I suggest that you take the cylinder to your welding gas supplier, and have them replace the valve with a standard welding valve. It'll be cheaper than that stupid yoke adapter.

That would be a good idea.

 

[thatguysb]

okay just to confirm what i am saying, this cylinder is my personal cylinder, i own it outright at no point would this be in circulation.
Nobody else have access to this, the filling station will fill with whatever i tell them, oxygen or medical oxygen. co2 ect, they label each tank once filled and would change the label and each refill.

I never knew these valves could change, thats something i would look into.

 

[Capt Chrysler]

I have "heard" of folks filling the little bottles off the big bottles.

 

[Warrenator]

Sounds like it would work fine. Medical Oxygen same as Aviator's Breathing Oxygen same as Welding Oxygen. Different certification sticker but they are all equally "pure" as they use the same process to "make" the gasses.

Make sure your threads and whatnot that might have contact with the gas are squeaky clean, NO OIL. Use alcohol to clean not solvent.

 

[laser3kw]

Aviator's Breathing Oxygen

has to be tested for low moisture in the event of a high altitude mishap that your lungs won't suffer from icing.
https://www.faa.gov/pilots/safety/pilotsafetybrochures/media/Oxygen_Equipment.pdf link
neither medical or welding oxygen will meet those specs.

 

[Warrenator]

Sorry to derail conversation about welding oxygen.


"Aviator's Breathing Oxygen
has to be tested for low moisture in the event of a high altitude mishap that your lungs won't suffer from icing.
https://www.faa.gov/pilots/safety/pilotsafetybrochures/media/Oxygen_Equipment.pdf link
neither medical or welding oxygen will meet those specs."

Wrong, this is a common misconception. All the oxygen comes from the same process, basically super cooling the air and separating the different fractions based on what temperature they liquify at. So nitrogen, argon, oxygen, all are liquid at very low temperatures but boil off into gas again at different temperatures. They capture the gas they want, compress it, and sell it to you in whatever tank you want with whatever label you want. In the case of Oxygen, of course it is low moisture because the water froze out of it at a far different temperature. There is a mil spec for aviators breathing oxygen but all oxygen being sold today would meet that spec.

Your local FBO would like to charge more for aviator's breathing oxygen because it has been tested for low moisture, and whatever else the mil spec says, but really it is all the same stuff. The testing and certification of course costs money, and anything aviation related (parts, fuel, tools, mechanic qualification, etc) should be carefully checked as a matter of course. But it would be fine to use ABO for welding, or industrial processes, or Grandma.

Sorry to go deep on this, but it is a particular area of expertise of mine. (Odd combination of former work in a lab in industrial processes and being an aircraft mechanic and pilot, as well a hobby welder.)

 

[laser3kw]

All the oxygen comes from the same process, basically super cooling the air and separating the different fractions based on what temperature they liquify at

just to clarify a little more. As stated, yes, the oxygen gas pumped into the cylinder is for all intent and purpose is "moisture free". What the spec calls out as moisture free is the contamination that is in the fill line and cylinders (not the oxygen itself).
I started the job market way back as a "pumper" on a Union Carbide / Linde fill station. I ended up as a pumper for Airgas and later a manager for Airgas. I was trained on all the fill procedures for all gasses and cryogenics (other than flammables). I literally have filled tens of thousands of high pressure, medium pressure, low pressure, cryogenic and 6000 psi aviation backup nitrogen cylinders (dreaded "6k"' heavy bastards).
Industrial oxygen is typically the low end. The cylinders are odored tested, vented, vacuumed and filled.
Medicals are vented, odored tested, short purged with oxygen, vacuumed and filled on a dedicated fill rack just for medicals to prevent possible contamination from industrial cylinders.
Avators Breathing Oxygen was vented, odored tested, purged with dry nitrogen, vacuumed to pull out any accumulated moisture within the cylinder, short purge with oxygen and then vacuumed and filled.
The pollution or moisture in the cylinder comes from leaving the cylinder open after use typically. Users are suppose to leave 20psi ~50 psi in the cylinder to help assure consistence in the cylinder condition. Many people think they are helping or it safer to vent them down and leave them open (so they don't explode?).
So the "extra money" is not just a money grab, it's to pay for the extra fill procedure to assure product content.

 

[Warrenator]

Fair enough. Thanks for the extra info.

 

[pcmeiners]

has to be tested for low moisture in the event of a high altitude mishap that your lungs won't suffer from icing.
https://www.faa.gov/pilots/safety/pilotsafetybrochures/media/Oxygen_Equipment.pdf link
neither medical or welding oxygen will meet those specs.

Your lung can't ice up, unless you are dead for a good while, but your oxygen delivery system can.