better pack a lunch if you're going to use these tables.

Trout

----------
> From: Joel Silverstein <joelsilverstein@wo*.at*.ne*>
> To: David Shimell (shimell) <shimell@se*.co*>;
s_lindblom@co*.co*; techdiver@aquanaut.com
> Subject: RE: Trimix question - Real Tables 
> Date: Wednesday, September 30, 1998 9:44 AM
> 
> David, 
> 
> There are standard tables for standard mixes ---Hamilton Research Ltd has
> had standard trimix tables avaialble for years 
> 
> they are the Key West Consortium Tables -17/50/33 
> 
> Variable Oxygen Variable Helium tables for Trimix from 120 fsw - 250 fsw 
> 
> The single set of tables allow for the use of 16-21% oxygen  17-50%
helium
> content
> 
> Required decompression gas is EAN36 and Pure Oxygen. 
> 
> 
> There is a variation of these tables for shallower water diving and
single
> gas decompression 
> 
> Key West Consortium 18/35/47   
> 
> For depths of 130fsw - 230fsw 
> 
> This single set of tables allow for the use of 18-21% oxygen 30-40%
helium
> 
> Required decompression gas is EAN 55-65     oxygen is optional
> 
> These tables are exceltional, are used by many many divers, and are quite
> expensive, however they have an extremely reliable track record and
> eliminate the need for making up new tables every time you want to do a
> dive -- they also allow for mix variables which makes them wodnerful to
use
> on expeditions. --- No batteries needed. 
> 
> 
> 
> 
> At 03:07 PM 9/29/1998 +0100, David Shimell (shimell) wrote:
> >All
> >
> >>If one were going to use trimix in the deep rec/lite tec range,  as
many
> >>have been advocating here, for moderate exposures, ,  say, 100-160',
20-40
> >>minute bottom, and wanted to have a fairly standard mix to use rather
than
> >>doing a different mix for every dive, what would one use?
> >
> >As a slight digression, it is worth developing standard mixes and tables
for
> >ranges of depths and times.  I dive mixes for every 10 m, i.e. I use 50,
60,
> >70, 80 metre mixes together with the corresponding tables... My run
times
> >are also in 5 minute increments (easy to remember)  - usually 3 options
with
> >the middle run time being the planned run time.  This RT is usually set
at
> >around 90 minutes due to the water temperature in the UK.
> >
> >My tables for my 80m mix (16/44) go in 5 metre increments i.e. 80, 75,
70,
> >65, 60, 55, 50.  Thus if we mix for an 80 metre dive and weather
precludes
> >diving this wreck, and we have to do a 63m wreck, then I would simply
dive
> >my 65 m tables for this gas.
> >
> >For multiple day diving, I see a penalty of around 4 minutes maximum.  I
use
> >the same tables but add in a minute here and there (one minute 3 m
deeper
> >than my first mandatory stop, 1 minute in the middle somewhere and 2
minutes
> >on my last stop at 6 m.  This is in addition to 10 m/minute ascents and
deep
> >stops added.
> >
> >My tables are laminated and therefore re-usable.
> >
> >David Shimell
> >Project Manager, Sequent Computer Systems Ltd., Sandton, South Africa.
> >Email: shimell@se*.co* <mailto:shimell@se*.co*> 
> >
> >--
> >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
> >
> Joel D. Silverstein
> Scuba Training + Travel Co.
> http://www.NitroxDiver.com
> --
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