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Closed Circuit Rebreathers: Discuss Diy O2 in the Rebreathers - General Information forums: Hi Does any one here use welding grade O2 in their rebreathers? And if so have you encountered any problems. ...

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Old 20-10-06, 10:20 PM
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Lightbulb Diy O2
Hi
Does any one here use welding grade O2 in their rebreathers? And if so have you encountered any problems.
cheers
Mark
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Old 20-10-06, 11:30 PM
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Old 20-10-06, 11:55 PM
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l understood it was more to do with the moisture in the gas than the purity.
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Old 20-10-06, 11:58 PM
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I'm not sure the CDG lot use anything but welding O2.
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Old 21-10-06, 01:26 AM
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Quote:
Originally Posted by Diving Dude
l understood it was more to do with the moisture in the gas than the purity.
Aviation O2 is a bit dryer, welding O2 is just right.

Obviously you need to check for acetylene contamination in the O2 cylinder before you use it and check for the level of argon so that you can acurately calculate the END.
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Old 21-10-06, 10:51 AM
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Thanks for the replies.I have used it for most of this season,with no ill effect.People keep telling me not to, but nobody follows it up with why.
thanks again
Mark
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Old 21-10-06, 11:11 AM
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Apparently the difference between diving grade and welding grade is that diving grade is checked for purity before it is classed as diving. They are both filled from the same station. If it fails it presumably becomes welding grade, this would not be the sole source of welding grade obviously.

With diving grade at least you now roughly what you're getting.
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Old 21-10-06, 11:28 AM
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Quote:
Originally Posted by Okeanos

With diving grade at least you now roughly what you're getting.
More like you know exactly what you are getting...and you don't actually need to know exactly. I guess you are talking 3 or 4 9's purity anyway, and you won't be mixing that accurately!
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Old 21-10-06, 12:19 PM
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The tale I hear is that the differences between the grades is the paperwork trail to 'prove' how good it is. I had welding gear and if I'm short of a fill, or I just haven't got the time to boost it I'll use that.
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Old 21-10-06, 12:33 PM
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I have just received a quote for diving grade O2, £18 per cylinder, why on earth play with welding grade?

Diving He is £80.

Presumably both prices exclude vat.

There is a delivery charge and rental, but the prices aren't that bad really.
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