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 Mike Pallone wrote:

>You cannot use 100% O2 with standard scuba equipment. O2 in contact with
>petroleum based products can cause an explosion or fire. Standard suba 
makes
>extensive use of petroleum washers, screws, etc in the manufacture of the
>first and second stages. The demand valve for an O2 kit is made 
specifically
>for O2 delivery.

I agree that we should not use standard scuba equipment for O2, but we can 
convert it.

I use scuba equipment for delivering 100% O2 for decompression purposes (or 
first-aid).  My tank has been cleaned by Liquid Air.  They also installed a 
new medical oxygen valve on it. (my old steel tank has 1/2 inch valve 
threads).  I converted one of my regulators (cleaned and changed soft parts) 
so it is now oxygen clean and compatible; that's what we call oxygen 
service.  To connect the regulator on the tank, I purchase a specially made 
scuba to O2 (CGA 540) adapter.

Of course, there are many other ways of bringing O2 underwater.

One thing I find inapropriate (but we have little choice presently), is to 
use the same type of valve for Air, Nitrox, O2 and Trimix.  I wish that 
there will be a scuba Nitrox valve soon (so errors and wrong manipulation 
may be avoid).  With such a valve, we will be forced to have a Nitrox 
dedicated tank and regulator (as we should have) and Nitrox would become 
much more accepted.   My 72cf O2 tank has a CGA540 valve, so this one is OK. 
  For Trimix, I must rely on my two identification stickers (at least, there 
is no risk of explosion).

Michel Therrien
MTHERRIEN@sh*.mo*.mm*.sh*.co*

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