Picking the right rebreather (for me)

recomprssd

the Kiss site states max of 250 feet for the CK.

is it safe to exceed this ?

how conservative is the 250 foot limit?

dave

ReikiMaster

250 ft = 76m = 8.6 ata therefore if you are running an IP of 10bar onthe o2 first stage, you have still got a pressure gradient so there will be a flow.

honestly dont know how close you can take it. but as mark said there is a smaller 'deep' (ie you can take it deeper) orifice that runs at a higher IP.

smaller hole x higher pressure = same flow rate, but can go deeper before it hits an equal ambient pressure.

silentscuba

I have had my CK to just over 300 ft with no problem. The limiting factor is O2 flow with the standard unmodified CK. I know with O2 modifications, some have had their CK much deeper who knows how deep it has gone????

__________________
Curt McNamee
rEvo CCR Diver
KISS CCR Diver
www.silentscuba.com

Meerveld

Hi Al,

I went through exactly the same process a year ago. I also wanted a unit with extended range as I often dive deep wrecks on OC Trimix (deepest to date 463 feet). I started off wanting an eCCR with all the bells and whistles but after reading hundreds of accident reports and analysing the failure modes of eCCR's I swung completely the opposite direction and began looking at the simplest mCCR's I could find. Their simplicity also means that they are lighter and cheaper than most eCCR's.

I finally chose the Pelagian and can highly recommend it. It is simple, small and light and comes in at less than US$6k fully loaded with every option.

Andy Fritz has tested his unit to 120 meters and Mark Ellyatt has taken his to 147 meters several times.

Support and training are definitely things to be concerned about. Andy Fritz, the Pelagian's manufacturer, regularly travels to the US to provide training for clients. And, due to the units simplicity, replacing parts can be undertaken by a child with a monkey wrench.

The website for the Pelagian is Pelagian Diver Controlled Closed Circuit Rebreather

And it is reviewed on Rebreather World at http://www.rebreatherworld.com/pelag...ian-dcccr.html

Regards,

Carl

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decoweenie

VERY conservative.

I have dived the CK and SK well beyond said limit on regular basis. Details posted in the past...

ForTheFight

Many manufactures suggest a "depth limit" on their units, Dive Rite has (or had) a similar limit on the Optima. AP Diving has advertised a number of limits on their units, at DEMA one of the guys said it was "good to 300ft". Since there have certainly been KISS, Optima, Evo and Inspo dives deeper than those limits I would view what the manufacturer says as a suggestion.

Yes, many people have, myself included.

It is conservative. One of the reasons I have such respect for Jetsam and the KISS units is that they always encourage the diver to be conservative. This is part of the overall philosophy, messages about conservatism and safety are all over the manual, the specs and the unit itself ("This device is capable of killing you without warning").

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This post may be up to 80% accurate...the remaining 20% is speculation.

Numpty diver

Lots of rebreathers out there .. most Excellant quality.Al .. have you dived a rebreather before , Kinda like the advice i was given, get a good instructor to give a try a dive.Not be shy if they ask you to pay for this .20 hrs on a scr also makes your ccr course more enjoyable, learn the basics first ,.. bouyancy and discipline to check/clean the unit before and after you dive.My advice get a cheap used Dræger unit have fun with it then decide on spending ya hard earned $ on ccr.Numpty

ForTheFight

This is good advice, GUDC is a great place to do this.

No offense, but I am not sure that I agree with this, you will probably loose some money on the SCR and if you are sure you want to go to CCR than I would look for a used CCR unit of whatever type you are in the market for.

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This post may be up to 80% accurate...the remaining 20% is speculation.

ianfirmin

I've just been through the same process. I'm a professional mechanical design engineer now working with computer systems and have spent many years dealing with pneumatic and hydraulic solenoids and the like. I have a very jaundiced view of many of the parts only used on eCCR's. Thus I decided on an mCCR because they do away with a load of these failure prone electronic and mechanical parts. I had a short list of 3, the Pelagian, the Kiss and the Submatix. I know that many eCCR's can be flown manually but why pay extra for something you do not want. And cost WAS a factor. I do not want to be tempted to keep something I do not like because I paid a lot of money for it and would lose a lot of money by selling it. Until you spend some time using an Rebreather you do not know what you are going to like and what you are not going to like. Until you have RB experience a try dive on a new unit will not tell you much. I liked the look of the Pelagian best of all but I ended up buying a second hand Submatix mCCR. I couldn't find a second hand Pelagian and the high cost would have mentally tied me in to something I may not like. It's too early for a verdict on the Sub but early signs are positive. Once I have built up my hours I will be in a better position to try other units with a critical view. And, if I find one that suits me much more than the Submatix I will not lose a lot of money selling the Sub and buying something else. There may be other ways but this is how I did it. ATB Ian

Numpty diver

The good thing about lets say a good quality Dolphin is that you could sell it for pretty much what you paid for it 6 months or one year down the road.
If you buy a good quality ccr and dont like rebreathers your hundreds of dollars out of pocket.
I tried many ccrs before i decided on the sports kiss.. mccr i believe is the way to go.
But thats only my choice..
Numpty