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Date: Sun, 24 Mar 1996 22:28:38 -0500 (EST)
From: rfarb <rfarb@na*.ne*>
To: Richard Pyle <deepreef@bi*.bi*.ha*.or*>
Cc: Peter Den Haan <denhaan@ra*.or*>, richard.soderberg@mi*.ki*.se*,
techdiver@terra.net
Subject: Re: SCCR versus CCR

Well said, Rich. Rod

On Fri, 22 Mar 1996, Richard Pyle wrote:

> > 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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