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> >Forwarded message: >>From owner-techdiver@opal.com Wed Jun 29 16:00:01 1994 >Precedence: bulk >Errors-To: owner-techdiver@opal.com >From: "Terry McCracken" <terrym@it*.ns*.co*.au*> >Message-Id: <9406291425.ZM14310@it*> >Date: Wed, 29 Jun 1994 14:25:54 -0500 >X-Mailer: Z-Mail (3.0.1 04apr94) >To: techdiver@opal.com >Subject: NITROX - EAD >Content-Type: text/plain; charset=us-ascii >Mime-Version: 1.0 > >Hi Folks > Just completed my Nitrox course and a little concept has me confused. >STATMENT > By using nitrox to dive you calculate you Nitrogen absorbsion using >the EAD concept. > This means that you are saying that Nitrigen uptake is controled by >the partial pressure of the gasses involved. > >Ok I have no problem with that > >STATMENT TWO > By using nitrox on decompression stops you offgas at a greater rate. > This means that you are relying on the reduced partial pressure to >remove more nitrigen at a faster rate > >Again , no problem > >except.... >When you shift to nitrx on the decompression stop are you not, as far as >partial pressure of nitrogen is concerned actually at a shallower depth and >may have just exceeded you decomperssion ceiling.Could this not cause DCS by >causing too much nitrogen release. >Maby it is my misunderstanding but it appears to me that you are using >relative pressures for a nitrox dive but absolute for decompression diving. > Terry, you forgot: STATEMENT THREE bubble formation and presumably DCI depends on the difference between tissue gas tension and ambient pressure. For a bubble to exist: Pb>Pamb+Pst+Po where: Pb is the pressure of gases inside the bubble Pamb is ambient pressure Pst is the pressure due to surface tension Po is pressures due to other stuff but you had already guessed this, all decompression "M values" give allowed tissue inert gas tension compared to ambient pressure. David Doolette ddoolett@me*.ad*.ed*.au* ps. sent under egray account-my mail is busted again.
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