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SCUBA-L  September 1999, Week 1

SCUBA-L September 1999, Week 1

Subject:

Re: SEC: UNCLASSIFIED:-Re: Mixed drinks (Nitrox and Air)

From:

David Strike <[log in to unmask]>

Reply-To:

Scuba diving discussion list <[log in to unmask]>

Date:

Thu, 2 Sep 1999 11:03:27 +1000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (73 lines)

On 02 September 1999 09:21, Craig Turner wrote:
 
> Hey Strike,
 
G'Day, Mate!
 
> >If you're interested, I can post you privately a lengthy article written
> by
> >a partner of mine about his first hand experience of an O2 explosion.
> It's
> >certainly given me cause to be more cautious!  :-)
 
> Seriously, I've been following this 'mixed drinks' thread with interest. I
> am curious about this whole O2 cleaning business.
 
> I suspect that there is a lot of money being made by mis-information. I
can
> understand the requirement to clean tanks, due to the methods of filling,
> but I cannot see the requirement to have 'nitrox' compatible regs for
below
> 40% mixtures.
 
I'm more of the opinion that rather than 'mis-information', it's more to do
with caution and the fact that there is a general reluctance to openly
commit and say, 'it's definitely safe to use say, 40% O2 mixes with
uncleaned equipment'.   'Believing' a practice to be safe is far different
from stating that it is definitely and incrontrovertibly proven to be safe
based on proven theoretical and empirical studies.  Hence the fact that, as
a topic, it excites vigorous debate.
 
I'm not without sin in the matter of always using cleaned equipment! <BWG> -
and certainly not in the business of saying, 'Don't do as I do.  Do as I
tell you!".  But when it comes down to the question of risk, I do tend to
advise towards caution!  That's just me!  (Anyway! Without cowards like me,
there'd be no yardstick by which to measure the brave!)  :-)
 
Given the choice between the two statements, "There's no evidence to show
that it's dangerous!"  and, "There's no evidence to show that it's safe!", I
always tend to opt for the latter, and plan accordingly.  That doesn't mean
that those who prefer the former are wrong.  It's a question of personal
priorities!  :-)
 
> I noticed Scuba Pro (amoungst others) sell special nitrox regs, but my
> understanding is that these are not compatible with pure O2. There fore
I'd
> have to ask what is that point of having a nitrox dedicated reg for less
> than 40%, and for over 50% surely you need O2 cleaned equipment.
 
Who says?  And why?  :-)
 
> Am I missing something here? (I'm not nitrox qualified myself)
 
> Also, after a tanks been nitrox cleaned, can you still use normal air
> fills? For example if you go to a dive shop that doesn't provide nitrox
> fills, will you still be able to get your tank filled, and still maintain
> its 'clean' status?
 
It's often largely to do with whether the shop uses a hydro-carbon free
compressor.  In a 'clean' air station  that pumps nitrox, an air fill is
just another nitrox blend!  A 'normal' compressor may well pump minute
amounts of contaminants into the cylinder.  (remember the days when you were
always advised to sniff the air after getting a cylinder filled?) :-)
 
> Craig
 
> PS Post the explosion story!
 
As the article appeared in a controlled circulation magazine and I don't
have the author's permission to post it to the world, I'm sending it to you
privately!  :-)
 
Strike

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