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Stefan,
You can buy these things in Australia. They are 300 bar 6l cylinders with a
thin metal inner shell that has been wrapped with kevlar. I have not used them
but I'm told they are very light to carry around. I assume this translates to
much more buoyancy in the water.
The same (or very similar) tanks are used by the fire brigade.
They have only recently been approved for in water use. Something about salt
crystals getting in between the fibres and sawing away at them.
Personally I would not bother.
Firstly because of the pressure. Most dive shops cannot pump to 300 bar and
those that do either charge too much for it or fill the tank so fast you lose
most of the pressure when it cools down (not to mention the stress on your
gear, orings, etc).
Secondly I don't think they would last very long being scraped through rusty
metal holes in wrecks.
Regards
James Dibbs
Sydney, Australia
-----Original Message-----
From: Stefan Bolka [mailto:sbolka@er*.co*]
Sent: 13 February 2001 10:12 AM
To: GUE Mailing List
Cc: techdiver@aquanaut.com
Subject: Tank question
Ok, I have too much time to think and browse the internet so bear with me. BTW
thanks to everyone about the fins question.
So I was talking with my Girlfriend's father, and ex-fireman, about scuba and
he asked me a question that I thought to put to the list.
How come we don't use carbonfiber wrapped high pressure cylinders? They are
smaller and get hold gas at a higher pressure safer, hence why the fire
department uses them (so I was told). Does anyone have any insight on this?
Thanks as always,
Stefan.
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<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>Stefan,</FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>You
can buy these things in Australia. They are 300 bar 6l cylinders with a thin
metal inner shell that has been wrapped with kevlar. I have not used them but
I'm told they are very light to carry around. I assume this translates to much
more buoyancy in the water.</FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>The
same (or very similar) tanks are used by the fire brigade.
</FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>They
have only recently been approved for in water use. Something about salt
crystals
getting in between the fibres and sawing away at
them.</FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>Personally I would not bother. </FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>Firstly because of the pressure. Most dive shops cannot pump to 300 bar
and those that do either charge too much for it or fill the tank so fast you
lose most of the pressure when it cools down (not to mention the stress on your
gear, orings, etc).</FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>Secondly I don't think they would last very long being scraped through
rusty metal holes in wrecks.</FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV> </DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>Regards</FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2>James
Dibbs</FONT></SPAN></DIV>
<DIV><SPAN class=205213303-13022001><FONT color=#0000ff face=Tahoma
size=2></FONT></SPAN><SPAN class=205213303-13022001><FONT
color=#0000ff
face=Tahoma size=2>Sydney, Australia</FONT></SPAN></DIV>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader><FONT face="Times New Roman"
size=2>-----Original Message-----<BR><B>From:</B> Stefan Bolka
[mailto:sbolka@er*.co*]<BR><B>Sent:</B> 13 February 2001 10:12
AM<BR><B>To:</B> GUE Mailing List<BR><B>Cc:</B>
techdiver@aquanaut.com<BR><B>Subject:</B> Tank
question<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Ok, I have too much time to think and
browse
the internet so bear with me. BTW thanks to everyone about the fins
question.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>So I was talking with my Girlfriend's
father,
and ex-fireman, about scuba and he asked me a question that I thought to
put
to the list.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>How come we don't use carbonfiber
wrapped high
pressure cylinders? They are smaller and get hold gas at a higher
pressure safer, hence why the fire department uses them (so I was
told). Does anyone have any insight on this?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Thanks as always,</FONT></DIV>
<DIV><FONT face=Arial
size=2>Stefan.</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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