Thanks Steve! That is very helpful. So really welding O2 works just fine for what we are doing. Anyone know about the fittings for SS tubing and the wall thickness? Thanks, Scott WatersSent from my U.S. Cellular BlackBerry® smartphone
From: Steve Seymour <stsdms79@connectgradd.net>
Sender: owner-personal_submersibles@psubs.org
Date: Sun, 6 May 2012 11:11:06 -0500 To: personal_submersibles@psubs.org<personal_submersibles@psubs.org> ReplyTo: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] O2
The short answer is that there is no difference. The same grade of oxygen goes into both. It has to do with the way the tanks are filled. Medical oxygen tanks are emptied before they are refilled and welding tanks are not. Aviation oxygen has more moisture removed removed to prevent freezing at altitude. And of course the label is different for liability.
Sent from my iPad I was at my local welding and gas supply the other day and they were asking me how my sub was doing and we got on the conversation about the life support system and how it works. They told me they could not sell me medical grade oxygen with out a prescription from a doctor which I thought was kind of weird. They said I might be able to use oxygen that you use for welding, but it is not as pure. Does anyone on psubs have any ideas on what to do?
Also I had asked a question a while back about the tubing in the K-350. I have decided to go with stainless steal, but was still wondering what wall thickness to go with and how do you connect them (flair fitting, compression fitting, or something else?)
Thanks,
Scott Waters
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