Why did you Pick SCR as opposed to CCR

Spareparts06

For the collective wisdom. I am interseted in why you chose a SCR rather than a CCR. I am looking for input on the Pro's of SCR. RB80 guys I love that unit but dang I just cant use the Scuba-Pro so I guess Im going to die,Im DIR Just don't use the right Brands. I am Looking at the Dolphin and Ray.

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Buck-O-Five

The only reason I can think of is, if someone gave me one for free. Other than that, No.
Is that pro-SCR?

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firemandiver

Dolphin and Ray

Pros:

1) Very simple and easy to understand.
2) Not a lot of moving parts, fairly easy to maintain.
3) Reasonably safe (can only barely kill you)
4) Cost is quite reasonable compared to CCR
5) Very popular units...easy to find parts and good info from experienced users.

Cons:

1) Must mix for depth. Not a lot of room for changes in dive plan.
2) Old technology. Has been surpassed by CCR for most folks.
3) Still very popular, but no longer being prodiced by Drager. Parts still available, but no new units.
4) BC can be quite uncomfortable. Many people change to a wing BC
5) Ray Only..... Limited to max depth of 70 ft. Lungs made into bag(harder to clean and sanitize well). Shorter scrubber duration.

There are many other little quirks about the Dolphin, but these are the main things in my opinion. All in all I really like the Dolphin. I changed the the things I didn't like and I've been very happy. Still I have spent a small fortune over the last few years. I could have gotten a full CCR for what I have in the Dolphin.

I'm sure there will be many opinions on this subject. Hope this helps. FD

Dave Sutton

Lack of response ought to be a good indication. SCC rigs are obsolete other than for RMV keyed ones used for caving, such as the Rebreather-80. Do yourself a favor and skip this part of the learning curve. Go CCR. Start with a good manually controlled one and you cannot go wrong.


Dave

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Numpty diver

I still believe the dræger scrs have a strong place in the rebreather community.(imho)
I still hold courses for the Dolphin and ray ( both depth 40m recommended by dræger )
There cheap n fun way to get into rebreathers.
You can still buy new units ,shop around or call germany where they WERE produced.
Dræger stopped production of the Dolphin last year and the ray the previous year.
Parts are appaerantly going to producded for many years.
Nice units to mccr
Dean

EBT

Personally, i think a properly designed PASCR with the CL in the right place would be a viable solution.

When you couple it with appropriate drive gases (mix and volume for bailout), you have quite a nice package that doesnt need half as much faff as a system with electrickery

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PaulTG2

Hello,

I originally went the SCR route. The primary purpose was to learn inexpensively while enjoying most of the benefits of rebreathers. It wasn't long before I moved to CCR -- less than 25 dives dives. SCR basically had all the annoyances of rebreather diving and half the advantages.

There really isn't much of a difference in the total cost (rebreather, gear, total training costs) between a good SCR and a used mCCR such as a Sport KISS.

Sincerely,

-p

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Dave Sutton

And then you can be the guy who either sits out the dive here because we've gone deeper than you are mixed for, or be the one that everyone is scowling at because they are diving shallower than they are capable of because "someone else" has gas not mixed for a depth that was available.

It's the gas logistics and blending to depth that's the issue. We have had MANY dive trips here go to suboptimal wrecks on any given day because we had divers who, at the last minute when weather allowed, were mis-mixed.

For caves, where depths are not hugely variable on any given day, and for simplicity and reliability in that (bailout driven) enironment, a RMV keyed rig makes sense. In open water where dive-site selection is a matter of "how's the weather looking today" they really limit flexibility. Our policy now is that divers should plan depths between 50 and 130 (feet) *every time they come aboard* and if they are mis-mixed for 130 and the rest of the guys want to dive those wrecks... they sit out. The CCR guys all say "fine with us" while the (few remaining) SCC guys slave over mixing and end up with the wrong gas anyway.


Dave

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Abbo

I think the argument made for SCRs is that you don't have to worry about hyperoxia, because the calculation for MOD is the same as for OC, and the PO2 can't exceed the PO2 of the gas you tested back at the shop. Hypoxia shouldn't be a problem either. Removing the need to know your PO2 seems to have very definite advantages. Of course, most of us fear hypercapnia far more than hypoxia or hyperoxia, but removing one risk from the long list must have something to be said for it. My main reason for moving to rebreathers was to reduce the cost of Helium: I have spent a lot of money making the switch to CCRs, and I am a long way away from recouping my investment because the capital expenditure keeps rising! Not that I regret my move but there's always another must-have add-on!

zoo_diver

I think you sum it all up with this line -- the cost of gas. While your upfront costs are going to be big -- you have to buy the rig, the training, and all the new gucci parts. But if you are doing or going to do some serious mixed gas diving, there is no doubt that you will see the cost savings.

I think most folks are charging 30-40 bucks to get an 80 filled with trimix. Imagine paying a third of that for a 19 and getting 4+ hrs out of it...regardless of depth.

Good luck!