On Thu, 13 Mar 1997, SCUBA wrote:
> > 
>          Bob,
>             You are a little off base reguarding oxygen causing 
> rusting and lowering the po2. Moisture causes rust an is accelerated 
> in a high oxygen environment. If a tank is clean inside and is filled 
> with dry oxygen it will not rust in twenty years.
True but SCUBA cylinders are at arisk for getting moisture inside.
 Medical oxygen tanks 
> are given a lot number and expiration date when they are filled. The 
> large tanks ( 225 - 330 cuft.) are almost all made of steel, and 
> there expiration date is 5 years from when they were filled.
I am aware of this but it doesn't apply to SCUBA cyliders so is mostly
irrelevant.
> amount of oxygen and converts it into co2 ( carbon dioxide ). In this 
> situation it shouldn't be significant since you are generally at rest 
> when you decompress and are not generating a lot of co2 to start 
> with.
Why take chances though?
>      Finally from your post,  if you lower the percentage of o2 in the 
> tank, it is the fo2 not the po2  that changes. 95% oxygen in 20 fsw 
> still yields a po2 of 1.6 ata.

Sorry slip of the keyboard.

  ooooO         Bob        
 (    )   Ooooo    Favorite              
  \  (   (    )            RVT        
   \  )   )  /                
         (  /

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