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Scuba Forum / General / February 2007

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carbon monoxide

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dhjournalist@sbcglobal.net - 23 Feb 2007 00:54 GMT
I have heard that you can loose oxygen while you are diving if you do
not open the valve all the way or there is not the right mixture of
carbon monoxide. How much carbon monoxide can be in your tank for you
to still be all right, at any depth?
Reply to this Message
TonyP - 23 Feb 2007 01:00 GMT
> I have heard that you can loose oxygen while you are diving if you do
> not open the valve all the way or there is not the right mixture of
> carbon monoxide. How much carbon monoxide can be in your tank for you
> to still be all right, at any depth?

You gotta be kidding, right?
Reply to this Message
jack-a-roe - 23 Feb 2007 01:01 GMT
> dhjournal...@sbcglobal.net wrote:
> > I have heard that you can loose oxygen while you are diving if you do
[quoted text clipped - 3 lines]
>
> You gotta be kidding, right?

Sort of. Can you not survive with any?
Reply to this Message
dazed and confuzzed - 23 Feb 2007 01:34 GMT
> I have heard that you can loose oxygen while you are diving if you do
> not open the valve all the way or there is not the right mixture of
> carbon monoxide. How much carbon monoxide can be in your tank for you
> to still be all right, at any depth?

obviously, for you, 10% CO

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Reply to this Message
JRE - 23 Feb 2007 01:38 GMT
> I have heard that you can loose oxygen while you are diving if you do
> not open the valve all the way or there is not the right mixture of
> carbon monoxide. How much carbon monoxide can be in your tank for you
> to still be all right, at any depth?

Partially opening the valve is, um, not the right procedure.  As for CO,
according to http://www.scuba-doc.com/carbonmon.html :

"The maximal allowable level is 20 ppm (0.002%)."

John Eells
Reply to this Message
El Stroko Guapo - 23 Feb 2007 03:12 GMT
>> I have heard that you can loose oxygen while you are diving if you do
>> not open the valve all the way or there is not the right mixture of
[quoted text clipped - 7 lines]
>
> John Eells

In late August, 1946, J. Cousteau and his merry band went cave diving in
the Fountain of Vaucluse in Avignon. (Ottonelli first dove the cave in
1878, so the route was known.) Jean Pinard made the first descent solo,
putting a weighted line down to 90 feet. Cousteau and Dumas, connected
with a buddy line, went down next.

The details of what happened next vary somewhat between reports.
Somewhere around 150 feet the depth gauge, carried by Dumas, imploded.
At about the same time, both divers became light headed and disoriented.
Dumas lost his mouthpiece but managed to recover it. Cousteau, confused
and frightened witless, frantically tried to scramble up the down line,
impeded by the buddy line attached to the negatively buoyant,
semi-conscious Dumas. Meanwhile, the surface tender, thinking the
jerking line was a signal for more rope, payed out line instead of
pulling up. Finally, the tender sensed that not all was well and began
to retrieve the line. Disaster was averted and two more divers, Tailliez
and Morandiere, did the same dive with similar results.

It was later determined that exhaust fumes had been drawn into the
compressor and the high partial pressure of the carbon monoxide was
poisoning the divers.

abstracted from my book which really is going to print someday.

esg
Reply to this Message
JOF - 23 Feb 2007 15:01 GMT
> abstracted from my book which really is going to print someday.
>
> esg-

It should. You did a lot of research and came up with a load of stuff
that enthusiastic divers will find informative and entertaining if not
downright fascinating. Ya done good. Get it out there.

JF
Reply to this Message
Sheldon - 25 Feb 2007 18:33 GMT
>>> I have heard that you can loose oxygen while you are diving if you do
>>> not open the valve all the way or there is not the right mixture of
[quoted text clipped - 33 lines]
>
> esg

Given your information, which is quite interesting, would you recommend a
tester for anyone who dives?  They are not cheap, but given some of the
stories I've heard...
Reply to this Message
Greg Mossman - 25 Feb 2007 20:47 GMT
> >> dhjournal...@sbcglobal.net wrote:
>
[quoted text clipped - 39 lines]
> tester for anyone who dives?  They are not cheap, but given some of the
> stories I've heard...

If the stories were told by the same guy who claimed people go blind
from diving with contacts, I wouldn't pay too much attention to them.

In the U.S., dive shops get their gas tested, hopefully.  There's a
greater danger in third-world countries, but then there's a greater
danger in third-world countries from all sorts of things.  Even though
CO is odorless and tasteless, it usually accompanies contaminants with
a bit more flavor.  If the air tastes bad, it might be.  Regardless,
I've never met anyone who tested their own gas for CO before a dive.
Maybe you'll be the first.
Reply to this Message
Sheldon - 25 Feb 2007 23:36 GMT
>> >> dhjournal...@sbcglobal.net wrote:
>>
[quoted text clipped - 57 lines]
> I've never met anyone who tested their own gas for CO before a dive.
> Maybe you'll be the first.

Well, as I said, they do make a gizmo you fit to the tank to test for CO --  
http://www.lawrence-factor.com/cocop.htm

Still, as you say, there are a lot more things to worry about in certain
places and countries.  As a matter of fact, if a particular country was
killing off divers with bad air it would definitely make the news.
Reply to this Message
Greg Mossman - 26 Feb 2007 01:15 GMT
> >> >> dhjournal...@sbcglobal.net wrote:
>
[quoted text clipped - 63 lines]
> places and countries.  As a matter of fact, if a particular country was
> killing off divers with bad air it would definitely make the news.

Not if they suppress the news.  It's rumored that divers have been
disappearing in certain countries for years.  There used to be a lot
more rec.scubans, for example.  I can't believe they all died of
natural causes.
Reply to this Message
Sheldon - 26 Feb 2007 22:35 GMT
>> >> >> dhjournal...@sbcglobal.net wrote:
>>
[quoted text clipped - 86 lines]
> more rec.scubans, for example.  I can't believe they all died of
> natural causes.

Well, for the few divers who have died, the article I read said that there
are probably a bunch of divers who got sick but didn't know why.  Maybe one
of those gizmos is worth it.  One goes permanently on your line.  The other
attaches directly to the tank and you crack the valve to test it.  I don't
think it stays on after that.  Either one is under $100.
Reply to this Message
Greg Mossman - 27 Feb 2007 05:20 GMT
> >> "Greg Mossman" <moss...@qnet.com> wrote in message
>
[quoted text clipped - 96 lines]
> attaches directly to the tank and you crack the valve to test it.  I don't
> think it stays on after that.  Either one is under $100.

Maybe I need that.  I've gotten sick from diving plenty of times, but
always blamed it on seasickness or vertigo, usually with an underlying
hangover.  And here I could have blamed it all on CO poisoning.
Reply to this Message
Joe English - 23 Feb 2007 04:05 GMT
>> I have heard that you can loose oxygen while you are diving if you do
>> not open the valve all the way or there is not the right mixture of
[quoted text clipped - 7 lines]
>
> John Eells
don't dive to deep - it will be your last - if you get off the boat
Reply to this Message
Joe English - 23 Feb 2007 04:03 GMT
> I have heard that you can loose oxygen while you are diving if you do
> not open the valve all the way or there is not the right mixture of
> carbon monoxide. How much carbon monoxide can be in your tank for you
> to still be all right, at any depth?

Are you for real or just a troll - Carbon Monoxide?????  You better head
back to class  and get your money back
Reply to this Message
Sheldon - 23 Feb 2007 06:06 GMT
>I have heard that you can loose oxygen while you are diving if you do
> not open the valve all the way or there is not the right mixture of
> carbon monoxide. How much carbon monoxide can be in your tank for you
> to still be all right, at any depth?

If you're serious, that's like asking how much poison can I drink and still
be okay.  Carbon monoxide would be injected into a tank by faulty filling
equipment.  They do make testers for this, not cheap, but I've heard that 2
divers die each year from carbon monoxide.
Reply to this Message
Adam Helberg - 23 Feb 2007 21:30 GMT
>I have heard that you can loose oxygen while you are diving if you do
> not open the valve all the way or there is not the right mixture of
> carbon monoxide. How much carbon monoxide can be in your tank for you
> to still be all right, at any depth?

The gas in a scuba tank is not oxygen but usually air or some mixture. The valve
should be fully open for diving. There should be no CO in the tank.

Adam
Reply to this Message
Lee Bell - 24 Feb 2007 13:22 GMT
>I have heard that you can loose oxygen while you are diving if you do
> not open the valve all the way or there is not the right mixture of
> carbon monoxide.

You lose it if you do open the valve all the way too.  Each time you exhale,
you loose some . . . unless you're using a closed circuit rebreather.

> How much carbon monoxide can be in your tank for you to still be all
> right, at any depth?

Very little.
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