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Date: Sep 20, 2008 08:38
Paul, my understanding is that the failure you mention is the normal
failure for this sort of vessel, and that a circumferential failure is
unheard of...until now.
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Author: David LesherDavid Lesher Date: Sep 20, 2008 11:47
>Paul, my understanding is that the failure you mention is the normal
>failure for this sort of vessel, and that a circumferential failure is
>unheard of...until now.
I said:
>The safety engineer I spoke two was not aware of any history of body
"spoke two"? Sigh; I am regularly surprised by my improving ability to
type major errors more and more frequently. If only I could market the
skill...
Anyhow, I asked about the type of failures [longitudinal vs
circumferential] but she had no ready data. From what I've seen posted,
SC[U]BA tank failures are of two basic types. The most common involves
a longitudinal crack starting at the neck and propagating downward; a
wedge size piece may come off or the tank can split open without ejecting
a chunk.
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Author: Sylvia ElseSylvia Else Date: Sep 20, 2008 15:57
David Lesher wrote:
> As JB has noted, there sure does not seem to be a lot of data on
> circumferential cracking. The only mentions I find are on big boilers;
> along a welded seam.
Do you know how the hemispherical base is attached to the rest of the
cylinder? Is it welded on, or is it somehow fabricated in-situe?
Sylvia.
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Author: David LesherDavid Lesher Date: Sep 20, 2008 17:22
Sylvia Else writes:
>Do you know how the hemispherical base is attached to the rest of the
>cylinder? Is it welded on, or is it somehow fabricated in-situe?
Every one I have seen is one piece; I assume it's a casting.
--
A host is a host from coast to coast.................wb8foz@ nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
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Author: Sylvia ElseSylvia Else Date: Sep 20, 2008 17:27
David Lesher wrote:
> Sylvia Else writes:
>
>
>> Do you know how the hemispherical base is attached to the rest of the
>> cylinder? Is it welded on, or is it somehow fabricated in-situe?
>
> Every one I have seen is one piece; I assume it's a casting.
OK, thanks.
Sylvia.
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Author: David LesherDavid Lesher Date: Sep 20, 2008 18:34
>>Do you know how the hemispherical base is attached to the rest of the
>>cylinder? Is it welded on, or is it somehow fabricated in-situe?
>Every one I have seen is one piece; I assume it's a casting.
--
A host is a host from coast to coast.................wb8foz@ nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
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Date: Sep 20, 2008 18:56
> Boy was I wrong...
Fascinating, thanks for the link.
--
Cheers
Dave Kearton
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Author: Sylvia ElseSylvia Else Date: Sep 20, 2008 19:42
David Lesher wrote:
>>> Do you know how the hemispherical base is attached to the rest of the
>>> cylinder? Is it welded on, or is it somehow fabricated in-situe?
>
>> Every one I have seen is one piece; I assume it's a casting.
Interesting viewing, but according to the premliminary report the O2
cylinders in question were made from steel. Maybe they can be extruded
in the same way, but the commentary in the video made specific reference
to aluminium's ductility.
However, a quick search reveals manufacturers supplying seamless oxygen
cylinders, even though the method of manufacture isn't detailed.
I'm rather surprised that steel is used for the aeronautical
application, given that aluminium has a greater stength to weight ratio.
Presumably there's a reason.
Sylvia.
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Date: Sep 20, 2008 20:02
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Author: veritasveritas Date: Sep 20, 2008 21:11
David Lesher wrote:
>>> Do you know how the hemispherical base is attached to the rest of the
>>> cylinder? Is it welded on, or is it somehow fabricated in-situe?
>
>> Every one I have seen is one piece; I assume it's a casting.
What every boy and girl wanted to know but were too afraid to ask :)
That was an education for me......
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