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Date: Fri, 22 Mar 1996 12:14:08 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
To: Peter Den Haan <denhaan@ra*.or*>
Cc: rfarb <rfarb@na*.ne*>, richard.soderberg@mi*.ki*.se*, techdiver@terra.net
Subject: Re: SCCR versus CCR

> There has been a lot of discussion re rebreaters, both Semi Closed 
> Circuit, SCCR, and Closed, CCR. Most of the discussion treats both 
> systems as if they're similar. They are miles apart, both from a design 
> point of view, cost, training, performance, application and diving, with 
> the CCR being much more complex, dangerous and expensive. You can have 
> 75% of the rebreather benefit with the SCCR, yet you increase the 
> complexity tenfold going to a CCR.

I agree for the most part, but I would drop the "75%" to maybe "40%", and 
I would reduce the "tenfold" to maybe "threefold".  I would also not have 
used "more dangerous" as a way to deliniate CCR from SCCR.  Most of the 
"danger" comes from poor design (for both kinds of 'breathers) and 
misuse.  CCR systems in general are "more dangerous" **ONLY** in the wrong 
hands.  In the right hands (well-trained hands), SCCR systems (in 
general) are probably more dangerous because without sensors, you DO NOT 
KNOW the PO2. That doesn't change no matter how well-trained you are.

Aloha,
Rich

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