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decoweenie · 25th January 2006, 07:29

Quote: (Originally Posted by ROB DAVIE)

I have found the average of one free litre per minute quite acceptable.

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...

25th January 2006, 07:29	#3 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Re: Oxygen Usage Quote: (Originally Posted by ROB DAVIE) I have found the average of one free litre per minute quite acceptable. 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... __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM Last edited by decoweenie : 25th January 2006 at 08:23.
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