Dear all,
our group services 2 cryostats. We typically fill liq N2 once per week. Since the entrance of superconductancy in our lab in 1984 we use the braided stainless steel type of transferline with an inhouse machined adaptor. In fact if I am correct we still use the same one as we started out with. No failure, no breakage, not the risk of anyone getting hurt by spilled liq N2, splintered remains of tubing or panic reactions. Let alone the better safety the cost of procurement is easily compensated but less hassle.
The hose came together with the self-pressurizing liqN2 vessel that we use for filling. I am not aware of the costs nor of the type of material that is used on the inside.
I'll check that for those that are interested.
Regards,
__________________________________________
Hein Schouwenaars
Business Analytical Services&Support
Dow Benelux N.V.
P.O. Box 48
4530 AA Terneuzen
The Netherlands
Phone: + 31 115 673944
Fax: + 31 115 673729
Email: HPASchouwenaars_at_dow.com
-----Original Message-----
> From: Dee-Hua Huang [mailto:dee_at_scripps.edu]
> Sent: vrijdag 20 juni 2003 21:44
> To: AMMRL
> Subject: Tubing for L-N2 transfer
We recently switched from black rubber vacuum hose, which I had used for over 10 years, to Nalgene 50 Silicone Tubing (8060-0130) for L-N2 transfer. It is slightly on the expensive side, but seems to work very well for us. A magnet service tech told me he had used this type of tubing for years, and never had single incident (cracking) on it. The other time saving factor : by gently wiping the "frozen" tubing with a towel after the L-N2 transfer is done, it will go soft and ready to be disconnected from the magnet within a minute or two.
Dee
--
Dee-Hua Huang, Ph.D.
Director, Chemistry NMR Facility
The Scripps Research Institute
10550 N. Torrey Pines Rd.
La Jolla, CA 92037
(858)-784-2329
(858)-784-2391 (FAX)
dee_at_scripps.edu
Received on Mon Jun 23 2003 - 13:29:19 MST