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***jradomski*** · 22nd January 2006, 02:01

Quote: (Originally Posted by James Appel)

I have a question (never having dived a rebreather outside the USA).

How do you know your getting medical grade oxygen when getting fills, as it seems that in some placed only industrial grade maybe available.

What is the difference between industrial grade and medical grade (besides medical grade is analyzed and industrial is not).

I have never had a problem getting good oxygen anywhere.. if in 3rd world countries.. I usually find out what types of valves are in use and have my own adapters incase the LDS doesnt do oxygen.. I have gotten my fills at hospitals more than once..

Also be aware that medical grade doesnt guarantee 100% oxygen, Many medical facilites around the world use Oxygen derived from PSA systems.. This oxygen ,must meet the standard 93 +/- 3%.. if they are going for the best purity its 95.4.%, but they usually taget the standard at 93% because this generates significantly greater volumes of gas..

for 95.4% the remainder is argon 4.5%, trace gases .1% (mostly co2)

at 93% there is 2.5% n2 in the gas

22nd January 2006, 02:01	#3 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,022	Re: Oxygen question Quote: (Originally Posted by James Appel) I have a question (never having dived a rebreather outside the USA). How do you know your getting medical grade oxygen when getting fills, as it seems that in some placed only industrial grade maybe available. What is the difference between industrial grade and medical grade (besides medical grade is analyzed and industrial is not). I have never had a problem getting good oxygen anywhere.. if in 3rd world countries.. I usually find out what types of valves are in use and have my own adapters incase the LDS doesnt do oxygen.. I have gotten my fills at hospitals more than once.. Also be aware that medical grade doesnt guarantee 100% oxygen, Many medical facilites around the world use Oxygen derived from PSA systems.. This oxygen ,must meet the standard 93 +/- 3%.. if they are going for the best purity its 95.4.%, but they usually taget the standard at 93% because this generates significantly greater volumes of gas.. for 95.4% the remainder is argon 4.5%, trace gases .1% (mostly co2) at 93% there is 2.5% n2 in the gas __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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