Sean,  you wrote 
>
>Fourth, a 40 of oxygen filled to supply pressure (2015-2200 psi)
>contains more than enough gas to deco out on for that dive, unless you
>are doing ridiculous bottom times, in which case you should ask
>yourself if you can do two shorter dives instead of one long one, or
>you are doing a ridiculous deco for a given dive, or if your RMV is
>poor and you need to hit the gym.
>

This has come up a few times before, recently I was speaking with some
folks in Florida about this same issue. 

It seems that you folks are filling your 40 cuft 3000 psi oxygen cylinders
to only 2/3rds their rated volume resulting in approximately 26 cuft of
gas. One operation told me they will only fill to the supply pressure of
the oxygen for "legal reasons" another very large operation tells me they
only fill to supply pressure because they don't have an oxygen booster. 

Now we know this is where the stroke mix (80%) came from by topping up
these tanks to rate pressure, but that's not an issue since 80% is just.
well its just stroke mix. 

Up this way all of the reputable fill stations have gas boosters and are
very happy to fill oxygen to 3000 psi so one has a proper fill.

Is the reason for the acceptance of a partial fill purely the fact that
there are no gas boosters out there or is there another reason ? 

I have also seen some oxygen suppliers able to deliver O2 in supply
pressures of 4500 psi but that's not too common, 2400 and 3000 supplies are. 

Just looking to find out why ? 

Thanks 

Joel Silverstein
http://www.nitroxdiver.com

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