Mailing List Archive

Mailing List: techdiver

Message Display

On Jul 20,  3:20pm, "A.APPLEYARD" wrote:

}   How easily could alternating between nitrox and heliox be managed with a
} large AMRB which had 2 diluent cylinders (for ordinary diving both turned on
} and both containing air, but) one can contain air and the other can contain
} helium or heliox and the diver can switch between them? Presuming that he can
} easily empty his bag & his lungs to flush when changing diluents.
}   For trimix: is there such a thing as a ppN2 meter that could be put in an
} AMRB?
}   Since when have ppO2 meters been available that would have been suitable for
} use in AMRB's?
} --
} Send mail for the `techdiver' mailing list to `techdiver@opal.com'.
} Send subscription/archive requests to `techdiver-request@opal.com'.
} 
}-- End of excerpt from "A.APPLEYARD"

One idea that I have been bouncing off people for a while is, why not put
into the diluent bottle a Helium/Nitrogen mix?  For any given maximum depth,
the optimal F(N2) would be sufficient to bring the equivalent narcotic depth
up to the desired maximum air equivalent.

This way you get the advantage of minimizing the He in the bottom mix, while
utilizing just a binary mix rebreather.  You do not, however, get the
benefit of substituting N2 for He while ascending, only the benefit of 
substituting O2 for the N2/He mix (as usual).  However, unless extended
deep decompression is required by the profile, it seems to me that the
penalty over optimum gas mix is minimal - you should be in the 40'-10' zone
for most of you decompression anyway, with the bulk of the mix O2.

Comments please.

Wrolf

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]