Skipping open circuit and going straight to CCR

[takez0]

This is my first post here. I've learned a ton on this board and I'm grateful for the insights you all provide.

I'm getting into technical diving and I'd like to jump straight into a CCR. Does the group see any benefit or hindrance in skipping open circuit tech training costs and equipment costs and going straight into a CCR? CCR's are obviously an investment. I'd rather not spend money on a new BCD, manifold, tanks, etc., that would only be used specifically for dual-tank open circuit, considering I know where I want to end up already. Let me know your thoughts or if you think this is missed training opportunity.

 

[Wibble]

Restricting your depth to 6m/20ft seems to be extremely limiting. That's less than the tidal range round here. There can't be many dive sites less than 6m around the world, not in comparison with all the Open Water depth (18m/60ft) sites.

Of course there's not much to a rebreather outside of the plumbing.
But there's a lot more to diving on a rebreather when you must monitor your oxygen levels.

 

[jale]

Restricting your depth to 6m/20ft seems to be extremely limiting. That's less than the tidal range round here. There can't be many dive sites less than 6m around the world, not in comparison with all the Open Water depth (18m/60ft) sites.

Of course there's not much to a rebreather outside of the plumbing.
But there's a lot more to diving on a rebreather when you must monitor your oxygen levels.

Learning RB with a pure oxy rb is, in my view, the best approach as you get a really good understanding of the loss of oxygen due to metabolism and get familiar with the buoyancy making you aware of the small changes in gas addition or removal. Diving oxy rb teaches you how to adjust CL volume so you can even dive without any bcd-wing.
And in many places, there is a lot to see in the 6m range.
I do regularly dive a pure oxy and I really enjoy the simplicity.

 

[jale]

Yes, absolutely.

However, this is ignoring the received wisdom to keep CNS and POT levels down.

Dunno about you, but POT -- Pulmonary Oxygen Toxicity -- really screws my lungs up with that tight breathless feeling. It's like smoking a pack of cigarettes.

Well, like everything, awareness and training is part of the process. If you do dive where your OTUs are becoming a problem, there are strategies to put in place...

 

[grantmac]

Some militaries start divers on O2 RB during the selection phase for their trade with no prior scuba experience required.

 

[happy-diver]

Restricting your depth

Duuuuude we've got hundreds and hundreds of miles of the stuff



Look how shallow it is heaps to see heaps to catch heaps of wrecks

FIVE METRES ISH


You see what happens Wibble is with an open mind new stuff falls in and mixes all around
then it gets full and pushes the old stuff out, and sometimes the new gets pushed out too


Yeah monitor O2 well you don't have to monitor an spg anymore


Did you buy that BSAC manual your father had, from the link I sent you


Ultra magnificent!

That's less than the tidal range round here.

Pretty ugly losing all those cocklers when the tide comes in

 

[broncobowsher]

But not forget the OP is looking to go deeper, not just cruise shallow reefs.
So for this thread a pure O2 rebreather isn't going to be the correct answer.

 

[Angelo Farina]

But not forget the OP is looking to go deeper, not just cruise shallow reefs.
So for this thread a pure O2 rebreather isn't going to be the correct answer.

As already explained, a pure oxygen rebreather is just a super-simple CCR useful for training of novices. After some time with it, you move to something more complex, which allows for greater depth.

 

[happy-diver]

Ok I'll dispense with the written word

See this thing I built in the laundry which many would associate with being an O2 rebreather

See that pointy silver nozzle thing on the left of the unit, if I plug another gas bottle into that
I't somehow becomes a fully functioning closed circuit (NOT an Oxygen) rebreather anymore

and if we're talking within one hundred metres, a not depth limited unit


No need to tow an oversized trailer if you're not going camping for seven years on the moon


Thanks enjoy

 

[jale]

Ok I'll dispense with the written word

See this thing I built in the laundry which many would associate with being an O2 rebreather

View attachment 815289

See that pointy silver nozzle thing on the left of the unit, if I plug another gas bottle into that
I't somehow becomes a fully functioning closed circuit (NOT an Oxygen) rebreather anymore

and if we're talking within one hundred metres, a not depth limited unit


No need to tow an oversized trailer if you're not going camping for seven years on the moon


Thanks enjoy

Every time you post a pic of your unit, my Triton gets jealous. Especially about the placement of the opv

 

[Wibble]

Ok I'll dispense with the written word

See this thing I built in the laundry which many would associate with being an O2 rebreather

View attachment 815289

See that pointy silver nozzle thing on the left of the unit, if I plug another gas bottle into that
I't somehow becomes a fully functioning closed circuit (NOT an Oxygen) rebreather anymore

and if we're talking within one hundred metres, a not depth limited unit


No need to tow an oversized trailer if you're not going camping for seven years on the moon


Thanks enjoy

'Tis truly a thing of beauty -- doesn't look home-built at all! Would love to see more photos, especially the internals: lung(s) and scrubber.

Obvs an oxygen rebreather doesn't need any PPO2 monitoring as the only gas can be oxygen with a side order of CO2. Depth control: a rope on a float.