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ROB DAVIE · 25th January 2006, 16:24

Quote: (Originally Posted by decoweenie)

Rob,

If you track the actual O2 used per dive versus the minutes dived, I am sure you will find the amount to be more than 1 LPM. In general, I found that 1 LPM is more-or-less the metabolic rate of an active diver with normal finning. Slightly less on deco. More for swimming against current.

When account for wastage, the value will add up.

I did this for the first 1000 minutes of diving CCR a long time ago, and it was around 2 LPM due to wastage/ascent/etc.

Of course, the actual value will depend on your dive profile (more sawtooth ?), depth (more ascent wastage), deco (more flushing), etc.

I no longer track this usage since I found that it didn't fluctuate much for my diving, so using 2 LPM to plan for the dive trip eversince.

Just based on what I see...

Phi,

It was late last night, and I was helping Steve edit his poll. It looks as if I was thinking of the metabolic rate, rather than the average useage.

You are spot on as usual. The figure of 2 litres per minute is indeed a good "real world" average for planning purposes. Thanks!

Rob

25th January 2006, 16:24	#9 (permalink)
ROB DAVIE Administrator Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: HOUSTON, REPUBLIC OF TEJAS Posts: 1,120	Re: Oxygen Usage Quote: (Originally Posted by decoweenie) Rob, If you track the actual O2 used per dive versus the minutes dived, I am sure you will find the amount to be more than 1 LPM. In general, I found that 1 LPM is more-or-less the metabolic rate of an active diver with normal finning. Slightly less on deco. More for swimming against current. When account for wastage, the value will add up. I did this for the first 1000 minutes of diving CCR a long time ago, and it was around 2 LPM due to wastage/ascent/etc. Of course, the actual value will depend on your dive profile (more sawtooth ?), depth (more ascent wastage), deco (more flushing), etc. I no longer track this usage since I found that it didn't fluctuate much for my diving, so using 2 LPM to plan for the dive trip eversince. Just based on what I see... Phi, It was late last night, and I was helping Steve edit his poll. It looks as if I was thinking of the metabolic rate, rather than the average useage. You are spot on as usual. The figure of 2 litres per minute is indeed a good "real world" average for planning purposes. Thanks! Rob
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