Why CCR?

[DCBC]

I would love to see some good answers here and look forward to them.

Advantages

1. Gas efficiency (which translates to cost savings vs. OC);

2. Provides warm moist gas (keeping you warmer on cold dives);

3. Silence (beneficial in underwater photography, but also enhances the experience of diving);

4. Decompression efficiency (you always have the optimum mixture regardless of depth);

5. Easier to dive in isolated locations (with additional absorbent and relatively small bottles);

Disadvantages

1. Higher cost of additional training;

2. Higher cost of initial equipment and maintenance (sensors);

3. A higher degree of risk in operation;

4. More challenging to operate (this may be deemed to be an advantage or disadvantage, depending upon the diver's preference)

 

[Meng_Tze]

Give a full trimix guy a CCR. "Here's a tool that you can use to go deep; very deep (look in this month's Advanced Diver Magazine where there's more than 1 dive to deeper than 500' written up), BUT; you're a new diver on this thing... so keep your depth to less than 140 feet, and ONLY use AIR Diluent right now; because you're not certified for trimix in your rebreather yet."

What is different/more difficult about diving mix on CCR rather than OC? If you know your basic gas laws, your gas management on CCR; what is it that makes CCR mix so different from OC mix? Where there are no one for one 'translations' you should be able to figure things out. If you can't, surely you have no business diving mixed gases?

 

[wedivebc]

What is different/more difficult about diving mix on CCR rather than OC? If you know your basic gas laws, your gas management on CCR; what is it that makes CCR mix so different from OC mix? Where there are no one for one 'translations' you should be able to figure things out. If you can't, surely you have no business diving mixed gases?

I am going to guess you are not CCR trimix certified from that statement

 

[Meng_Tze]

I am going to guess you are not CCR trimix certified from that statement

That is irrelevant. Maybe I am not even CCR certified. The question still stands....

 

[wedivebc]

That is irrelevant. The question still stands....

Ever heard the expression "you don't know what you don't know"?
Well it applies here. There are many differences between OC and CCR trimix diving and anyone who is trained as a CCR trimix diver is aware of those differences.

 

[Meng_Tze]

Ever heard the expression "you don't know what you don't know"?
Well it applies here. There are many differences between OC and CCR trimix diving and anyone who is trained as a CCR trimix diver is aware of those differences.

Without going into detail, please elaborate if you would.

 

[Scott L]

Here we go...

 

[Docc]

Without going into detail, please elaborate if you would.

How does one elaborate without going into detail?

 

[HowardE]

Without going into detail. Would you say that a diver with 25 hours of diving... ANY DIVER is ready to make 300 foot dives?


When a diver begins diving a CCR, they are a NEW CCR diver. Regardless of their OC experience, the CCR is a new tool, and hopefully new CCR divers would treat it with the respect that it deserves.

Why would 20-30 hours of CCR time be referred to as the "death zone" (TDI Evolution manual)?

Without going into detail... A new CCR diver can bailout to OC, and make a direct ascent to the surface because they should not be going into deco. They are a new diver, and that's how they've been trained. Bailing out on a trimix dive is different, especially when you have a deco obligation. Switching from optimum gas to non-optimized gas at depth causes the deco to pile on. It's a whole different set of rules. Maybe some people can figure it out. Maybe not?

I would hope that new CCR divers would just want to be comfortable and familiar with their units, and work into technical diving, the same way they did when they became OC technical divers.

 

[DCBC]

Without going into detail. Would you say that a diver with 25 hours of diving... ANY DIVER is ready to make 300 foot dives?

A diver with 25 hours of diving has no business diving a CCR regardless of depth.