Hi Roger, etal...
I was also thinking about chiming in with the same info. I have used the exact same tubing from Fisher and I have not had a problem with it as well. The oldest length that I am currently using is probably 6 - 8 years old, however is beginning to show signs of cracking. My question I was going to post on was that when ordered a replacement for this old length from VWR (because I have an online account with them), they didn't have the exact replacement so I bought 10' of the 3/8 id, 5/16 wall black rubber. I haven't put it into service yet as I wanted to ask the group if there is any reason to avoid using such a thick wall.
But indeed, I do give a thumbs up for thinner wall black rubber!
Neal
Neal J. Stolowich, Ph.D.
ULNMR Facilities Manager
Senior Instructor
Department of Chemistry
University of Louisville
Louisville, KY 40292
Office: 502 852 7894/Fax: 502 852 8149
-----Original Message-----
From: Kautz, Roger [mailto:R.Kautz_at_neu.edu]
Sent: Tuesday, January 28, 2014 5:10 PM
To: Glyn Williams; Plant,Daniel; ammrl_at_ammrl.org
Subject: AMMRL: Liquid Nitrogen Transfer
I'm also late to this conversation, but curious if anyone else has tried natural rubber (not latex) hose, or knows of problems with it. I've been using the same piece for 10 years (after a latex hose shattered). It's a black rubber hose, 1/2 inch i.d., 1/8 inch wall (Fisher Scientific 14-167G). A similar red rubber hose has been in use on another magnet nearly as long. With a metal fitting to the nitrogen tank's flare fitting, there is no stress on the hose; at the other end the hose fits neatly on the nitrogen fill port. I prefer it to the stainless steel hose because it goes on and off smoother, is lighter and faster, and you can see by the vibration whether liquid is going through or the lN2 dewar has gone dry. But safety is a primary concern, if anyone has ever heard of one shattering.
-+=+-+=+-+=+-+=
Roger Kautz
r.kautz_at_neu.edu / 617 373 8211
Principal Research Scientist / Program Manager / Director NMR Facility Barnett Institute of Chemical and Biological Analysis Room 102 Hurtig Hall, Northeastern University, 360 Huntington Ave, Boston MA 02115
________________________________________
From: Glyn Williams [Glyn.Williams_at_astx.com]
Sent: Tuesday, January 28, 2014 6:29 AM
To: Plant,Daniel; ammrl_at_ammrl.org
Subject: RE: AMMRL: Liquid Nitrogen Transfer
Also late, but having used both options, I would strongly recommend a stainless steel hose, with strengthening sleeves at each end for improved lifetime. These are available from suppliers like Statebourne in the UK.
Glyn
*********************************************
Glyn Williams, D.Phil
VP Biophysics
Astex Pharmaceuticals
436 Cambridge Science Park
Milton Road, Cambridge
CB4 0QA, UK
Tel: +44(0)1223 226273
Fax: +44(0)1223 226201
glyn.williams_at_astx.com<mailto:g.williams_at_astex-therapeutics.com>
www.astx.com<
http://www.astx.com/>
*********************************************
From: Plant,Daniel [mailto:dan_at_mbi.ufl.edu]
Sent: 27 January 2014 15:49
To: ammrl_at_ammrl.org
Subject: RE: AMMRL: Liquid Nitrogen Transfer
Late to this conversation but the safest in my opinion is the metal flex hose.
The Teflon is the next best thing but they also will break under time and stress.
Wear eye and face protection in all cases.
Latex hose should be avoided at all costs.
The fellow Lew is referring to was a friend of mine.
The docs never did find out whether it was a sliver of latex or ice but it didn't matter to Sam...
From: Vernon M Russell [mailto:vrussell_at_wlgore.com]
Sent: Friday, January 24, 2014 5:00 PM
To: ammrl_at_ammrl.org<mailto:ammrl_at_ammrl.org>
Subject: AMMRL: Liquid Nitrogen Transfer - Use PTFE
I've been using the same PTFE hose (non reinforced) for 7 years. The only thing I've had to do is trim the ends where the tube slides onto the fill port. This will eventually start to leak due to the tube sliding on and off the fill port. I'd strongly recommend others use the Teflon tubing. You can use short pieces of the Teflon along with a metal coupler to attach to the tank and metal pipe elbows to get the right tube orientation to reach the fill port.
Vernon
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Received on Fri Jan 31 2014 - 08:05:25 MST