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08-06-2018, 12:52 PM
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Join Date: Jan 2016
Location: Acton, MA
Posts: 117
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Long time cave diver here. I mix tri-mix in my garage. The T cylinders of O2 you get at your local gas company is the same 02 if it welder's O2 or medical O2. The come from the same supply. The only difference is that they suck out the contents of the cylinder if it is medical grade O2 to ensure that there is no contamination, while they just open the valve and drain any leftover on returned tanks. It's really a non-issue for me and lots of other divers. Someone did the math and its like a possible 0.3% reduction of O2 quality.
And there are the divers who don't mind paying more for the stamp because it makes them feel good and they perhaps they justify skipping the 'gas quality' verification step. Invest in a good O2 monitor and verify every T cylinder.
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Working on the fuse (RV-10).
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08-06-2018, 02:23 PM
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Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 829
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Quote:
Originally Posted by Brantel
Will most medical supply places refill tanks for non medical (no script) use?
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In my experience, many Medical suppliers will not fill if they know it is for Aviation, and many welding supply companies will not fill a medical bottle. I also find that many welding supply companies are not open on the weekend when I am able to get to them.
Get a prescription. It makes life much easier! Whoever does your FAA or Basic Med exam should be able to write you one.
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08-06-2018, 05:01 PM
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Join Date: May 2008
Location: Martinsville, IN
Posts: 454
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Oxygen is a funny "drug" seeing as how no one can live without it. The FDA says that the act of filling a bottle for someone is considered manufacturing, and therefore requires a prescription from a doctor for the person getting the bottle filled. I presume that aviation oxygen has some sort of licensing attached to it as well that only allows them to fill bottles for aviation use, but I'm less familiar with that end of it. Essentially you can fill your own bottle if you have a source, but when you fill for someone else you are a manufacturer and therefore need a license.
Last edited by dtw_rv6 : 08-06-2018 at 05:09 PM.
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08-06-2018, 05:40 PM
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Join Date: Jun 2005
Location: Raleigh, North Carolina
Posts: 1,128
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I worked in the petroleum piping industry for years and occasionally had to get my own supplies. I asked the counter man at the supply shop what the difference was in welding oxygen as opposed to medical oxygen. He just looked me in the eye and said ?price?.
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Tom Norwood
Classic "Short Tail 6A N822PM
TMX-O360. Phase 1
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08-06-2018, 08:51 PM
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Join Date: Jun 2008
Location: Kalamazoo, MI
Posts: 263
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Is everyone using welding oxygen? I understand that all the oxygen is the same, but how the cylinder is cleaned prior to filling is the difference. Last I checked, my supplier did not want to sell me welding oxygen for our use. I have an aviator oxygen tank right now that needs refilled.
Thanks
Jim Butcher
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08-06-2018, 09:02 PM
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Join Date: Jul 2008
Location: Prosper, TX
Posts: 373
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[quote=h&jeuropa;1278856]Is everyone using welding oxygen? I understand that all the oxygen is the same, but how the cylinder is cleaned prior to filling is the difference. Last I checked, my supplier did not want to sell me welding oxygen for our use. I have an aviator oxygen tank right now that needs refilled.
I'll sell you a fill from my welding tanks for $5. I'll call it Aviator's Oxygen if you like for $50... 
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RV-10 N415JS
Slow build kit #40874
Homebuilt Kit Champion Oshkosh 2019
Atlantic crossings: 2
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08-07-2018, 01:56 AM
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Join Date: May 2008
Location: Martinsville, IN
Posts: 454
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Quote:
Originally Posted by h&jeuropa
Is everyone using welding oxygen? I understand that all the oxygen is the same, but how the cylinder is cleaned prior to filling is the difference. Last I checked, my supplier did not want to sell me welding oxygen for our use. I have an aviator oxygen tank right now that needs refilled.
Thanks
Jim Butcher
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Yeah... that's an issue.... if you are welding with aviators oxygen. Welding requires VERY pure gas or you end up with all kinds of nasty problems. Not a problem if you're just working on a Farmall in your garage. Totally different if you are welding on a nuclear reactor in a submarine or Chicago.
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08-07-2018, 09:11 AM
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Join Date: Jul 2007
Location: granby co
Posts: 180
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O2 pump
I?m using a Hyd international pump to fill my O2 bottle (I fly over the mountains of Colorado and it has quit working. Does anyone out there know of a repair shop??? Or should I just send it back To the factory???
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08-07-2018, 09:44 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,147
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Quote:
Originally Posted by mtnflyer
I?m using a Hyd international pump to fill my O2 bottle (I fly over the mountains of Colorado and it has quit working. Does anyone out there know of a repair shop??? Or should I just send it back To the factory???
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I've worked with the HII boosters for years on high pressure air systems, they are good but the only place to have work done on them is at HII. You can order repair kits from them based on the symptoms of the booster and do the work yourself, but as far as having someone do it, I think you will have to send it back to them.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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08-07-2018, 01:27 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Quote:
Originally Posted by dtw_rv6
Yeah... that's an issue.... if you are welding with aviators oxygen. Welding requires VERY pure gas or you end up with all kinds of nasty problems. Not a problem if you're just working on a Farmall in your garage. Totally different if you are welding on a nuclear reactor in a submarine or Chicago.
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As noted here, and in bunches of other threads, any O2 you get from your local gas supply place is going to meet or exceed the (now almost) mythical ABO specification. Welder's, ABO, medical...all the same stuff, basically 99.5% or better pure O2.
There *are* research-grade oxygen specs, that run as high as 99.999% or better pure O2, but that's a specialty market for sure.
Just get the tanks from the local supply place. It'll be fine.
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