Gentlemen:
Since we are passing anecdotes, my experience with latex hosing
has been similar -> it normally splits all the way down the center after a
loud (but not too loud) crack. This is why I like to use it for LN2
fills; thick black rubber hose will actually shatter and create an eye
hazard (someone years ago reported such an accident caused a technician to
lose his sight in one eye).
At 03:23 PM 6/19/2001, you wrote:
>Hello all,
>With the history was a bit different. It was spectacular. Although the
>tubing was not latex, but a kind of synthetic blue plastic. It virtualy
>exploded during the transfer. There was a sharp bang and the thing became
>hundred of small pieces, but we just closed the tap and replaced the
>tubing and continued the transfer. It was such a fright for me that was
>just beggining at the time.
>Best wishes,
>Emidio V. L. da Cunha
>
>----- Original Message -----
>From: <mailto:g.moyna_at_usip.edu>Guillermo Moyna
>To: <mailto:ammrl_at_chemnmr.colorado.edu>ammrl_at_chemnmr.colorado.edu
>Sent: Wednesday, June 18, 2003 5:20 PM
>Subject: Anectdotal - Latex tubing crack...
>
>Howdy,
>
>This one is just an anecdote that some people may find interesting.
>Although I never heard of anyone having problems with latex tubing during
>liquid N2 transfers, I always knew that they could break. After more than
>two years of service, our latex tube did crack the other day. It wasn't
>spectacular at all when it happened, just a sharp 'snap!' and that's it.
>Since we had the tube covered with armaflex insulation, there was not much
>liquid N2 spewing all over the place. We just closed the N2 tap, replaced
>the tube with an identical 'new' tube that we always had as a backup, and
>kept going.
>
>What was interesting was how the tube cracked. Initially I noticed a
>longitudinal crack at the tip we plug into the magnet fill port. After I
>took it out of the armaflex, I saw that the crack went from end to end of
>the tube (almost six feet). That was pretty 'cool' as one of my students
>put it. The whole 6 foot crack appeared in one instant. Neat.
>
>As I said, just an anecdote for your Wednesday afternoon. I plan to keep
>using these things (covered with armaflex). $20 bucks for two years of
>service ain't bad...
>
>Guillermo
>
>+==================-------------- --- -- - - - -
>Guillermo Moyna, PhD
>Assistant Professor of Chemistry
>Department of Chemistry & Biochemistry
>University of the Sciences in Philadelphia
>600 South 43rd Street
>Philadelphia, PA 19104-4495
>
> "The only existing things are atoms and empty space.
> All else is mere opinion" - Democritus, 370 B.C.
>
>Office: Griffith Hall 360
>Phone: (215) 596-8526
>Fax: (215) 596-8543
>e-mail: g.moyna_at_usip.edu
>WWW: <?color><?param
>1919,1919,FFFF>http://tonga.usip.edu/gmoyna/index.html
><?/color> <?color><?param
>1919,1919,FFFF>http://www.usip.edu/chemistry/faculty/moyna.asp<?/color>
>
> - - - - -- --- -----------=================+
Dr. W. L. Jarrett
Assistant Research Professor
University of Southern Mississippi
School of Polymers and High-Performance Materials
Department of Polymer Science
Box 10076
Hattiesburg, MS 39406-0076
Phone: (601)266-4551
Fax: (601)266-5504
email: William.Jarrett_at_usm.edu
Received on Fri Jun 20 2003 - 12:13:12 MST