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Dean, and list, Dean Laffan wrote: (snips) > Wow, this site has some pretty amazing crap. > > Check out the "how to invert your twins if you're off the errr .... "husky" > type of physical build http://www.divernet.com/gear/invert1198.htm > > Here's a snippet of the accompanying text: > > > a very simple scuba system that consists of a twinset with manifold, one first > > and one second stage and no contents gauge at all. They simply shut off one > > cylinder pillar valve, then breathe off the other one until it is nearly empty > > and they sense an increasing breathing resistance. > > That is when they reach behind them, open the previously closed pillar valve > > and decant air from the full cylinder to the empty one. They then shut off the > > "donor" cylinder again. This decanting process is carried out twice. Then, > > with 50 bars left in each cylinder (from an initial 200 bar fill), it is time > > to head back to the surface. As Phi Lee quite correctly pointed out (but possibly too briefly): > I believe it is the system used by S&R people when diving in *ZERO* > visibility where a SPG is useless. Whilst this bloke may not (even) get that part of his diving right, his comments have some merit. Without going to the site I suspect (DON'T know) that he's talking of many emergency/military diving organisations. These commonly work in visually impenetrable water and use this technique, also commonly, with (in our eyes) "back to front" cylinders, probably specially designed ones (Strike, you want to embellish?) and manifolds. It's, quite literally, the ONLY way that they can manage their gas. In visually impenetrable water an SPG is obviously quite useless. Dean, we have such diving units here in Oz and I immensely respect what they (and their colleagues all over the world) do. It's their job, they don't have an "opt out" choice ... as we do. Which is not to say that all of them use this technique. Cheers, Christian -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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