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Are trimix fills comercially available for sport divers anywhere ?
Do trimix divers generally mix their gases themselves and how is
that usually done ? I suppose, that easiest way is first to put helium
into the tank and then fill it full with air. Or is the helium first
enriched by O2 to get different O2/N2 relations ?
How soon should the mix be used after the mixing so that helium doesn't
run away from the tank ? Or are ordinary valves and sealings enough
helium proof that this isn't a problem ?
Could somebody kindly send me the ISBN numbers of the Gilliam's et. al.
books "Deep Diving: ..." and "Mixed Gas Diving" ? Are they worht of reading
and can anyone recommend any other books about the subject ?
I tell in advance that I am not planning to start mixing right now, nor
I am going to get trained to mixed gas diving becouse such a training
is not available here. At the moment I am just interested in theoretical
aspects of deep and mixed gas diving and rebreather technology.
We do regularly in our club decompression wreck dives down to 45 meter.
In far future some of us probably will try mixed gas diving too. Most of
our known wrecks are shallower than 50-60 meters (average depth of Baltic
is 60 m), but of course there are couple of interesting "projects".
John Heimann wrote in article "Hose wars" :
> 1) It requires me to use a hose swivel on my primary first stage,
> because of the first stage design (Poseidon Odin). I'm not sure
> I trust the swivel (two more o-rings to blow!), and I worry that
> it cuts down on the Odin's otherwise terrific performance.
I have used two Poseidon hose swivels for sometime without problems
and I wouldn't afraid extra o-rings. You have already at least about
20 o-rings and two additional is just 10 % increase. I also think that
one swivel doesn't have any influence to Poseidon's performance especially
if you have already 2 meter hose for the 2nd stage hose.
Poseidon has had a new 1st stage for Jetstream/Odin for sometime. It has
one low pressure outlet more than the old one and the outlook design is
little different, I think it is better.
Jouni Polkko
CMAS P3 M1
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| Jouni Polkko ________ tel: +358-0-746074 |
| Kyl{kunnantie 1 | | / work:+358-0-1929674 |
| 00660 Helsinki | | < Fax: +358-0-1929539 |
| Finland |___|___\ internet: s32905u@sa*.hu*.fi* |
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