I have used latex hose for many many years. I would say that it is most convenient and inexpensive way to fill LN2.
I have a related question to ask group:
Is there anyone know where to order the vacuum adaptor which used to re-pump the vacuum of 230L LN2 tank?
Thanks.
Feng
-----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
This email and any attachments thereto may contain private, confidential, and privileged material for the sole use of the intended recipient. Any review, copying or distribution of this email (or any attachments thereto) by others is strictly prohibited. If you are not the intended recipient, please delete the original and any copies of this email and any attachments thereto and notify the sender immediately.
This message (including any attachments) may contain confidential, proprietary, privileged and/or private information. The information is intended to be for the use of the individual or entity designated above. If you are not the intended recipient of this message, please notify the sender immediately, and delete the message and any attachments. Any disclosure, reproduction, distribution or other use of this message or any attachments by an individual or entity other than the intended recipient is prohibited.
Received on Fri Jan 31 2014 - 07:57:40 MST