<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>As per my calculations Brian, that would be over the limit if it emptied out,</div><div id="AppleMailSignature">as far as G.L. rules on partial pressure of O2 is concerned.</div><div id="AppleMailSignature">You wouldn't have any O2 toxicity problems just an elevated risk of fire.</div><div id="AppleMailSignature">BTW I am just quoting the rules not advocating them. If it did happen that </div><div id="AppleMailSignature">the contents of your O2 tank emptied in to your submarine, I would be </div><div id="AppleMailSignature">inclined to go to the surface driving my thrusters at a low speed to avoid </div><div id="AppleMailSignature">heating the electrics.</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"> </div><div id="AppleMailSignature"><br>Sent from my iPad</div><div><br>On 8/05/2017, at 2:34 PM, Brian Hughes via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div>
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I carry a small O2 tank (20 cubic feet) internally, connected directly to a pediatric regulator. The outflow is piped to the inlet of my scrubber (it's an axial), via the same tubing used for O2 masks, mixing the gas in the process as it's drawn through with
the sub's air.<br>
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. It's how I did it with my DIY rebreathers and I feel safer being able to directly control my O2 and not have to worry about organic contaminants in any lines coming in from the outside. But that's just me AND I don't plan on spending 10 hours at max depth.<br>
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Brian<br>
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