Here is a repost of the info on polyurethane tubing that we have been
using happily for liq-N2 fills for many years:
Saint-Gobain "Tygothane" C210-A
1/2" ID x 5/8" OD x 1/16 wall (p/n AEM02036)
http://www.processsystems.saint-gobain.com/uploadedFiles/SGPPL-PS/Documents/Flexible_Tubing/FT-Tygothane-C210A.pdf
Once again: do not confuse with regular Tygon vinyl tubing. It will
shatter like glass when cold.
Tygothane replaces Nalgene "PurEster" tubing that is no longer available.
It can be obtained from a number of suppliers including Grainger and
McMasterCarr, the last time I checked.
One piece will last for years. I cover with a length of cheap
polyethylene foam pipe insulation from the hardware store to make it
easier to handle when it's cold. Leave a few inches of the Tygothane
uncovered at each end.
You will also need a brass adaptor to connect to the LN2 transport dewar.
These are available from a number of suppliers, but here is one:
Grainger Item # 3DVD4 (Goodyear Mfr. Model # PB-SFFX-0806)
Brass, Push-On Hose Fitting, Female, 1/2 In Hose ID
SAE 45-Deg Flare, Swivel, Hex Head Size 7/8 in
--Mike
-----------------------------
Michael Strain, PhD
Director, CAMCOR NMR Facility
University of Oregon
Eugene, OR 97403-1253
mstrain_at_uoregon.edu
541-346-4605 office/lab
541-556-4077 mobile
http://nmr.uoregon.edu
On Wed, 3 Dec 2014, Stephen Peurifoy wrote:
> Our magnet came with a braided stainless steel LN2 transfer line which
> is attached to a fitting with the same shape as the boil-off heat
> exchanger, complete with O-rings. It fits over the turret in place
> of the aforementioned exchanger and has a "stinger" that fits into
> the fill port. It's a thing of beauty and I never use it. A
> tremendous quantity of LN2 boils away cooling the line down before
> any liquid reaches the magnet.
>
> Consider this a shout-out to the contributor in the last iteration of
> this discussion who advised Tygothane (NOT Tygon!) tubing. I bought
> a length of that to replace the latex I was using and I love the
> stuff. Highly recommended.
>
> -Steve Peurifoy
> Chemistry Department
> Millersville University of Pennsylvania
> Millersville PA 17551
>
>
> On 2014/12/02 14:39, Joseph Sachleben wrote:
>> Hi All,
>>
>> I remember a few months ago there was a discussion about liquid nitrogen
>> fills. I have always used latex tubing to connect the nitrogen
>> dewar to the magnet. Some of you mentioned that you used stainless steel
>> l-N2 transfer lines to do the fills. The question I have is how
>> do you connect the stainless steel transfer line to the magnet.
>>
>> Thanks,
>>
>> Joe
>>
>> Joseph R. Sachleben, Ph. D.
>> Technical Director Biomolecular NMR Facility
>> The Division of Biological Sciences
>> 929 E. 57th St.
>> Chicago, IL 60637
>>
>> (773)834-9866
>> jsachleben_at_uchicago.edu
>>
>>
>>
>>
>>
>
Received on Thu Dec 04 2014 - 13:53:01 MST