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Date: Sun, 14 Apr 1996 02:18:54 -0400 (EDT)
From: Nick Simicich <njs@sc*.ma*.co*>
To: Raimo4252@ao*.co*
cc: techdiver@terra.net
Subject: Re: Pressed Steel 104s and 121s
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On Sat, 13 Apr 1996 Raimo4252@ao*.co* wrote:

> He obviously does not know. For the record, my ten year old 104's have never
> been filled with less than 3600psi, and have never failed hydro.

Perhaps you should get a metalurgist to explain why a hydro test is
meaningless when you regularly overfill the tanks, relative to the
rated pressure.  I believe that it is more or less the same reason
that a tank that fails hydro may pass if retested, and is still
considered unsafe.

> And the
> faber tanks (LP's) that are rated at 2640 here in the states are rated (off
> the top of my head) at appx. 3400-3500psi in Europe, give or take a hundred
> or so. I have the specs on the tanks, just not at my immediate disposal.
> 120's do have a purpose, but give me my 104's in a cave ANYTIME!!!!

I've heard this a number of times, and have also heard that the
European tanks have thicker walls, are tested to different standards,
are made from different alloys, and so forth.  I don't doubt you, Bob,
but are you sure that they are actually the same tanks, and not just
made by the same manufacturer?  If so, how?  (I also know that the
cave community does overfill relative to US rating in practice - and I
don't think that there have been any steel tank failures, although
there were some problems with AL tanks a while back - another reason
to avoid AL tanks if you overfill relative to ratings).

I worry about the statements that salesmen make.  "Just as good as a
copy of a Xerox."




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Nick Simicich - njs@sc*.em*.ne* - (last choice) njs@bc*.vn*.ib*.co*
http://scifi.emi.net/njs.html -- Stop by and Light Up The World!

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