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>To: Tim Olson - Underwater Ventures <deepdive@cv*.or*>
>From: rcreight@di*.ca* (Reg Creighton)
>Subject: RE:full face
>
>A combination of theories as to what is safe in gas switching in a full
face mask is what I persoanlly use and feel works perfectly.  While it is
true that you do not want to accidently mix gasses while breathing, in our
gas switching block, we incorporate 4 valves as inlets and one as an outlet
to your full face mask.  the top 2 valves are for bottom and/or deep mixes,
and are connected all the time.  The bottom 2 valves are for additional
mixes, EAN, or O2, and they incorporate quick connects, which we leave
disconnected when not in use. 
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>I have to say that at that point you are doing prcticaly the same thing we
are but you carry an addition block.  Why not loose the block as you are not
connected to it anyway.
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>A switch to a High PO2 gas requires you to actively think about what you
are doing.  In most cases, our doubles also incorporate the standard
isolation manifold too, so there would be no switching of gasses on the top
2 knobs, only control in case of a free flow or malfunction.  We also carry
the spare mask and we have 2 of our own octos as backup for us and others.
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>Again, it seems that you have just added a step and a gas switch actually
involves connecting one gas to another when the time comes.  Our problem was
over time, any wear and tear that causes ANY kind of leak in the system, and
it becomes a gas blending block.  You still have not shown me why that
manifold system can be trusted over a heavy dive load, not to fail.
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>
>Interested but not convinced
>
>Reg Creighton
>

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