How deep has an Inspiration been dived successfully?

trev jackson

The CO2 issues I had on the Kyogle dive were probably a result of a combination of my lack of physical fitness, the struggle we had to get down, and the relatively small scrubber on the Inspo.Getting down the line that day against the current we were really busting our arses, going as fast as we could because of our shortish bottom time plan. The unit itself had no failures as such, except that I think I simply pushed so much gas through it, it couldnt keep up. By the time we had ascended to about 140m the CO2 issues were gone. I was continuously flushing from the time I started the ascent and went back to normal operation there.The electronics were bog standard and worked perfectly well. I finished the dive on the unit, the total time was about 4 hours. Having said all that I wouldnt do another dive that deep on the unit. They are a simply fantastic bit of gear but they, like everything else, have their limitations

MHD

What am amazing week this has been, first Kevin Denlay posting on Diveoz, Now Mr Jackson on RBW. . You must be bored.

Yestedays dive was good. 20m Vis, zero current, huge fish life. Lots of Cod. Fisho's have well and truly found it, covered in Line and sinkers. 2 fishing boats working it when we got there, but they huffed off once we put divers in the water. Sean even enjoyed it, like it more than the Brisbane.

Matt

trev jackson

Not bored Matty, Its just that I tend to stay off internet forums these days unless I.....a] have something constructive to say and b] actually know what Im talking about from real experience. If I cant post within those two criteria I keep my big mouth shut. Glad you all enjoyed the wreck yesterday ive been doing a bit of underwater exploring myself up here lately

Paul G

Hi Trevor,

I don't know if you saw Simon's presentation at Oztek regarding CO2 and deep ccr diving, where he was saying that there are limits to the human physiology that allows CO2 to build up in the lungs while breathing at depth. I wonder if this is what you experienced rather than a problem with the Inspiration's scrubber? I guess it's an impossible question to answer.

If you were fitter you might have been able to work harder to get to the bottom more quickly, using more oxygen and therefore producing more CO2?? I don't know whether lack of fitness is a valid arguement or not, but then I've got no medical training so probably talking out of my hat!

Cheers,
Paul

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Paul G

I average about the same as you, so 350 / 0.9 = 388 minutes = 6.5 hrs approx.

Deep dives consist of about 95% deco so this sort of max time should reasonable with OC or another rebreather on hand.

Cheers,
Paul

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jradomski

on deco I am usually in the range of .5-.7 l of o2 per minute, normal swimming somewhere around .8 to 1.0 lpm... (alot depends on water temp and thermal protection)

so for me this is well beyond 6 hours.. On several dives in the 6 hr range I still had virtually no color change of the sorb..

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trev jackson

I guess I will never know. Simon did mention at the time that super fit people produce more CO2 but I doubt that I couldve worked harder even if I was an Olympic athlete, Like I said we were really going for it. If there had been no current and we couldve just dropped Im sure there would have been no issue whatsoever. On any other deepy type dives Ive done the unit has been fine,I think it was just the combination on that day, its not a combination i would repeat

Marc T

Fit people are able to consume more O2 to produce more "aerobic" power so they dont need to activate the non- aerobic system which drasticaly increase the CO2 production.
So for an identical power production they reject less CO2.
Remember if you are breathless its because you have activated the anaerobic system!
Also remember that body building ( for exemple ) could increase your anaerobic system and could drive to an increased CO2 production.
Endurance training is needed to increase safetiness in diving.

mtp

wizbang

Paul, Martin Parker touched on two relevant points during his talk at OZtek.

One was the depth limit of the Buzzer at 170ish which I assumed from the way he spoke was an average of inhouse testing to failure. They have given a 165m rating for the buzzer.

Martin spoke of people taking the buzzers off and mentioned the handsets should be fine but gas density and scrubber duration would be the issues to arise from there.

Martin also spoke about scrubber packing, and fine vs large sorb for the deeper dives. Martin's comment in a nut shell was, watch the video available from the web site, pack as such with std fine sorb and all will be good.

Martin also mentioned that AP did not condone buzzer removal or diving past it's sanctioned depth limit.

The Dawes for me, was ~5.5 hours 13-19C 20 min botttom time. No real current to speak of. All went swimmingly. hehe

If you decide on a way to remove the buzzer and cap the port I would be interested.

Mike

What's happened to you project to replace the buzzer with a HUD?

Mike

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