Why did you Pick SCR as opposed to CCR

Dutchy · 1st July 2008, 17:40

Quote: (Originally Posted by Dave Sutton)

Unless your flow decays during a dive and you die.

Want to come and see the rig that Dan Meyers died on due to that exact problem? It's sitting 5 feet from me now with a skull and crossbones painted on the back. Come on and see it..... I look at it every day. If he had converted it to a mCCR like was planning on doing the following week he'd be alive today.

SCC's a "Safe" alternative? You must be kidding.

Dave

I should have mentioned the SINGLE VR3 (or similar) as a safety net. There's a difference in having to rely on electronics and having them as an additional measure. E.g. current limited cells are NOT a problem (you select a suitable mix) and if it shows low you bail out. I wasn't advocating dropping the ppO2 measurement in my post, I just see it as a safety-net not a primary system.
This setup when in working order catches situations that shouldn't occur in the first place (but DO occur) such as an empty tank or clogged orifice.
So yes SCR's are a safer alternative in my book...

Marvintpa · 2nd July 2008, 19:02

Spareparts (original poster), just curious, what is it that prevents you from being able to use ScubaPro components? I believe the two second stage injectors are the only ScubaPro parts on the RB80 (and there's another in the BOV)- pretty small and simple.

If you are genuinely looking at SCR the RB80 is quite a good unit overall.

se2schul · 2nd July 2008, 19:27

Quote: (Originally Posted by Hanssing)

The SCR (Dolphin) will bubble on exhale, but when does a pSCR release its excess gas?

On inhale when the counter lungs get squeezed.
Whatever is in the outer bellows passes through the scrubber and is inhaled, while gas and any moisture in the inner bellows gets squeezed out through an opv.

se2schul · 2nd July 2008, 19:38

Quote: (Originally Posted by 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.

While I agree that CCR's offer total flexibility for any mix on the fly, pSCR's aren't nearly as bad as you make them out to be. Just mix the doubles for the deepest dive you'll likely do, then drive the rebreather off a stage bottle of the "correct" mix for the depth you're going to dive. Definitely more of a hassle than CCR, but I highly doubt that I'll find myself sitting out a dive.

Last weekend, my girlfriend wanted to do a dive where a considerable portion would be spent at 15 ft - right in the hypoxic zone for the mix in my on-board tanks. No problem. I just grabbed a deco bottle with EAN50 and drove the RB80 with that.

Spareparts06 · 3rd July 2008, 04:32

I was looking at dolphin and Ray short term. I want to go Full blown DIR and get a RB80 but I do not have a spare 10k sitting down. I am also looking at a Meg. Thank you all for your input.

I've always been about pushing my limits and this looks to be the next horrison

Nailer99 · 3rd July 2008, 04:57

Quote: (Originally Posted by Spareparts06)

I want to go Full blown DIR and get a RB80 but I do not have a spare 10k sitting down. I am also looking at a Meg.

Dunno about the RB80, but you're gonna burn through 10K pretty fast if you want a Meg.....Anyway, if you want to "go full blown DIR", then the Meg is not for you. GUE has made their position about CCRs quite clear: It's a non-starter.

Gary68 · 3rd July 2008, 05:36

Quote: (Originally Posted by Spareparts06)

I want to go Full blown DIR and get a RB80 but I do not have a spare 10k

I think Deepairmike over on CDF is making RMV PASCRs with a new mechanical valve instead of a bellows system. Assuming he is selling them I think his prices are lower then most RBs and a tiny fraction of an RB80. I like the sound of the no bellows valve also.

david higgins · 4th July 2008, 15:02

Hi I bought the Dolphin to use in a third world environment, ie Spain, as i get fed up waiting for parts and they often do not get delivered. the dolphin is a basic unit without any electronics (unless you want oxygen monitoring) and is very easy to look after. i was able to but 7 tubs of sofalime and i can get nirox to whatever level i want, also if sufficiently irritated i can buy a membrane system to give me 40%. the drawbacks are that it is not cleared below 40 metres and i needed to get a 10 litre bottle for deeper dives, but this bottle gives more than enough bottom time, and deco time. also the unit has been around a long time and is still used by professionals. i would say if you only wish to go to 40ish metres and likethe comfort of a rebreather, it is hard to beat the simplicity of a SCR. hope you get what suits you
Dave. ps if you want to try a dolphin we have units for training and the clarity of water not found in UK, also no tides. good diving.

Quote: (Originally Posted by 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.

**fireman** · 5th July 2008, 02:27

By the way, how much do those rb80's weigh? with reasonable bail out? Ever tryed climbing a ladder on a pitch boat with one? How about your 110# wife/girlfriend/dive buddy?

david_1 · 5th July 2008, 05:23

Quote: (Originally Posted by fireman)

By the way, how much do those rb80's weigh? with reasonable bail out? Ever tryed climbing a ladder on a pitch boat with one? How about your 110# wife/girlfriend/dive buddy?

wow... you not suggesting you pic your breather on how heavy it is. no I havent got one but that was not even on my lists of things to consider.

David

1st July 2008, 17:40	#31 (permalink)
Dutchy Rene Warries Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: Apr 2006 Location: Nieuwegein (The Netherlands) Posts: 835	Re: Why did you Pick SCR as opposed to CCR Quote: (Originally Posted by Dave Sutton) Unless your flow decays during a dive and you die. Want to come and see the rig that Dan Meyers died on due to that exact problem? It's sitting 5 feet from me now with a skull and crossbones painted on the back. Come on and see it..... I look at it every day. If he had converted it to a mCCR like was planning on doing the following week he'd be alive today. SCC's a "Safe" alternative? You must be kidding. Dave I should have mentioned the SINGLE VR3 (or similar) as a safety net. There's a difference in having to rely on electronics and having them as an additional measure. E.g. current limited cells are NOT a problem (you select a suitable mix) and if it shows low you bail out. I wasn't advocating dropping the ppO2 measurement in my post, I just see it as a safety-net not a primary system. This setup when in working order catches situations that shouldn't occur in the first place (but DO occur) such as an empty tank or clogged orifice. So yes SCR's are a safer alternative in my book... __________________ = This post is environmentally friendly. It is composed of 100% recycled electrons only. =
(Online)

2nd July 2008, 19:02	#32 (permalink)
Marvintpa Bad knees, matching brain Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Ontario, Canada Posts: 280	Re: Why did you Pick SCR as opposed to CCR Spareparts (original poster), just curious, what is it that prevents you from being able to use ScubaPro components? I believe the two second stage injectors are the only ScubaPro parts on the RB80 (and there's another in the BOV)- pretty small and simple. If you are genuinely looking at SCR the RB80 is quite a good unit overall.
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2nd July 2008, 19:27	#33 (permalink)
se2schul Custom Title Allowed! Current Rebreather/s: RB80 / Clone Other Rebreather/s: RB80 / Clone Join Date: Oct 2007 Location: Ottawa, Canada Posts: 106	Re: Why did you Pick SCR as opposed to CCR Quote: (Originally Posted by Hanssing) The SCR (Dolphin) will bubble on exhale, but when does a pSCR release its excess gas? On inhale when the counter lungs get squeezed. Whatever is in the outer bellows passes through the scrubber and is inhaled, while gas and any moisture in the inner bellows gets squeezed out through an opv.
(Offline)

2nd July 2008, 19:38	#34 (permalink)
se2schul Custom Title Allowed! Current Rebreather/s: RB80 / Clone Other Rebreather/s: RB80 / Clone Join Date: Oct 2007 Location: Ottawa, Canada Posts: 106	Re: Why did you Pick SCR as opposed to CCR Quote: (Originally Posted by 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. While I agree that CCR's offer total flexibility for any mix on the fly, pSCR's aren't nearly as bad as you make them out to be. Just mix the doubles for the deepest dive you'll likely do, then drive the rebreather off a stage bottle of the "correct" mix for the depth you're going to dive. Definitely more of a hassle than CCR, but I highly doubt that I'll find myself sitting out a dive. Last weekend, my girlfriend wanted to do a dive where a considerable portion would be spent at 15 ft - right in the hypoxic zone for the mix in my on-board tanks. No problem. I just grabbed a deco bottle with EAN50 and drove the RB80 with that.
(Offline)

3rd July 2008, 04:32	#35 (permalink)
Spareparts06 New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jun 2007 Location: Jacksonville Posts: 14	Re: Why did you Pick SCR as opposed to CCR I was looking at dolphin and Ray short term. I want to go Full blown DIR and get a RB80 but I do not have a spare 10k sitting down. I am also looking at a Meg. Thank you all for your input. I've always been about pushing my limits and this looks to be the next horrison __________________ ahhhhhhh
(Offline)

3rd July 2008, 04:57	#36 (permalink)
Nailer99 RBW Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jan 2007 Location: Seattle, WA, USA Posts: 265	Re: Why did you Pick SCR as opposed to CCR Quote: (Originally Posted by Spareparts06) I want to go Full blown DIR and get a RB80 but I do not have a spare 10k sitting down. I am also looking at a Meg. Dunno about the RB80, but you're gonna burn through 10K pretty fast if you want a Meg.....Anyway, if you want to "go full blown DIR", then the Meg is not for you. GUE has made their position about CCRs quite clear: It's a non-starter.
(Offline)

3rd July 2008, 05:36	#37 (permalink)
Gary68 New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Nov 2007 Location: Gainesville, FL Posts: 63	Re: Why did you Pick SCR as opposed to CCR Quote: (Originally Posted by Spareparts06) I want to go Full blown DIR and get a RB80 but I do not have a spare 10k I think Deepairmike over on CDF is making RMV PASCRs with a new mechanical valve instead of a bellows system. Assuming he is selling them I think his prices are lower then most RBs and a tiny fraction of an RB80. I like the sound of the no bellows valve also.
(Offline)

4th July 2008, 15:02	#38 (permalink)
david higgins New Member Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Mar 2007 Location: Spain Posts: 17	Re: Why did you Pick SCR as opposed to CCR Hi I bought the Dolphin to use in a third world environment, ie Spain, as i get fed up waiting for parts and they often do not get delivered. the dolphin is a basic unit without any electronics (unless you want oxygen monitoring) and is very easy to look after. i was able to but 7 tubs of sofalime and i can get nirox to whatever level i want, also if sufficiently irritated i can buy a membrane system to give me 40%. the drawbacks are that it is not cleared below 40 metres and i needed to get a 10 litre bottle for deeper dives, but this bottle gives more than enough bottom time, and deco time. also the unit has been around a long time and is still used by professionals. i would say if you only wish to go to 40ish metres and likethe comfort of a rebreather, it is hard to beat the simplicity of a SCR. hope you get what suits you Dave. ps if you want to try a dolphin we have units for training and the clarity of water not found in UK, also no tides. good diving. Quote: (Originally Posted by 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.
(Offline)

5th July 2008, 02:27	#39 (permalink)
fireman rEvo combat swimmer Current Rebreather/s: rEvo Other CCR Other Rebreather/s: rEvo Other CCR Join Date: Nov 2006 Location: chicago Posts: 540	Re: Why did you Pick SCR as opposed to CCR By the way, how much do those rb80's weigh? with reasonable bail out? Ever tryed climbing a ladder on a pitch boat with one? How about your 110# wife/girlfriend/dive buddy? __________________ Heres to you Capt. Bill Never Forget, and stay safe everyone.
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5th July 2008, 05:23	#40 (permalink)
david_1 New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jul 2006 Location: uk Posts: 39	Re: Why did you Pick SCR as opposed to CCR Quote: (Originally Posted by fireman) By the way, how much do those rb80's weigh? with reasonable bail out? Ever tryed climbing a ladder on a pitch boat with one? How about your 110# wife/girlfriend/dive buddy? wow... you not suggesting you pic your breather on how heavy it is. no I havent got one but that was not even on my lists of things to consider. David
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