After browsing on ebay, I realized that medical oxygen cylinders are alot cheaper than industrial ones. Is this because there's a larger market? Do used medical oxygen cylinders loose value quicker? And could a different valve be fitted onto the cylinder so I could use inert gases or industrial oxygen? Would the local gas supplier likely be able to swap valves or cylinders? Thanks.
It can't hurt to ask your supplier. Down here in the southwest I've had very good luck in getting valves swapped and the cylinders filled with something else. So far I've switched to CO2 from Oxygen and from Nitrogen. I had no problems at all. Both of my cylinders were steel.
John
"Jeremy Samuels" wrote: (clip) Would the local gas supplier likely be able to swap valves or cylinders? (clip) ^^^^^^^^^^^^^^^^ The medical oxygen cylinder we keep around for emergencies has an adapter would allow an ordinary regulator to be attached. I can see a safety issue here, though. Suppose you filled a medical oxygen cylinder with some other gas, and then later, someone tried to use it for breathing.
I mean putting the valve for whatever gas it was filled with on it, or swapping it for a cylinder with the right valve/gas. Keeping a medical oxygen cylinder with a medical oxygen valve filled with a different gas would be an accident waiting to happen.
I bought a couple of compressed natural gas cylinders ( used on boats for cooking. Natural gas rises LPG sinks so CNG is safer on boats ) at a garage sale. I had to go to three different gas suppliers before I found someone that would swap the valves and fill with inert gas. So it might pay to see if you can find someone in your location before you buy the cylinders. It can be done, but it might be hard to find someone that will do it.
Dan
Jeremy Samuels wrote: Would the local gas supplier likely
And thats why they wont refill O2 cylinders in Canada with welding gas
Hi john,
Caution on using C02 gas Cylinders for Oxygen and Nitrogen. Most C02 cylinders are only good to 900 PSI while Oxygen and Nitrogen are rated at 2,200 pcs.
At one point while in use on large flow C02 turns into 3 phase liquid Gas and Solid. Therefore the Tank might become brittle.
Try contacting
Austri Basinillo
Hmmm. All my CO2 cylinders are rated for 1800 psi. I would be really cautious of one rated at 900 psi. I measured about 850 psi on one cylinder that I was using for a non-conventional use.
Dan
I have access to a rather large CNG cylinder that was used for a CNG converted automobile. The cylinder is rated to 3000 psi, is fiberglass wrapped aluminum made by Luxfer. I've often thought that it would make a kick ass air pig for filling large tractor tires in the field. I also have access to a 5000 psi SCUBA compressor to fill it. What concerns me are the "CNG ONLY" warnings printed on the tank. Did the first two suppliers provide any justification for not wanting to re-valve the tank?
Shawn
No valid justification. They were worried about converting a fuel tank to a tank with an oxidizer. Which makes no sense since I wanted them converted to inert gas.
I would be cautious about filling a CNG tank with high pressure air without making sure all the petroleum products are out of it. I think filling it with 5000 psi air would be equivalent to filling it with
1000 psi oxygen.Dan
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