The only problem I have with stainless steel hose (we have the braided
kind from VBS) is that it is cumbersome and heavy and you definitely need
two people to set it up, and you need to support it to keep it fastened to
the magnet. With rubber tubing, you can refill on your own, and it holds
it shape when cold. We have been using braided garden hose with black
insulating hose around it to keep it cold, and which doubles as protection
when the garden hose shatters. But I do wonder if another kind of hose
will give us faster fill times.
Edward
On Fri, 20 Jun 2003, Bill Stevens wrote:
> At 03:41 PM 6/20/03 -0400, camass wrote:
> >dear group,
> >given the cost of an nmr i seem to be missing the point of using latex
> >vs a braided stainless hose. i have used latex but find it a pain. if
> >necessary (not desirable) you can remove the stainless hose while cold
> >and it presents no dangers i know of.
>
> I can write to that point. When I was a postdoc at UAB, learning to be an
> NMR manager at the knee of one of the best, Dee Huang, we had a stainless
> steel hose.
>
> I often helped with fills and one day discovered that our stainless steel
> transfer tube was not ours and had been reclaimed by its owner. I
> jury-rigged a transfer line of 3/8" copper tubing and was astonished at how
> much faster the fills went. I concluded then and still believe that the
> mass of the stainless steel apparatus resulted in much waste to keep it cold.
>
> I could be wrong, but my recollection is that fill times were cut by 2/3.
>
> Bill
>
>
> William C. Stevens, Ph.D. NMR Facility
> Director Southern Illinois University
> Carbondale, IL 62901-4405
> 618-453-6498 fax -6408 U.S.A.
> http://opie.nmr.siu.edu/bill.html
>
>
>
--
Edward T. Chainani
National Chemistry Instrumentation Center (NCIC)
Ateneo de Manila University
Loyola Heights, Quezon City
Philippines
phone: (632) 426-6001 loc. 5629
FAX: (632) 426-1323
e-mail: etch_at_ginto.chem.admu.edu.ph
Received on Tue Jun 24 2003 - 13:53:53 MST