This is a multi-part message in MIME format. ------_=_NextPart_001_01C835E2.6FD2D45C Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Greetings: My email has decided to be a bit cranky so let me attempt to post this note one more time. Partly as a consequence of the increasing demand for helium and growing shortage of helium the NMR facility at LSU is considering putting in a helium recovery line to transfer helium gas to a proposed liquifier in = the physics department. One major hurtle is the fact that the physics department is located approximately a block and a half from our 6=20 spectrometers. One solution, under consideration, is to push a flexible line through an existing conduit used for fibre optics. The question then arrises as to the permeability of different materials to helium = gas. Our feeling is that polyethylene is too permable so we are considering the use of teflon or thick-wall PVC. If anyone has any experience = choosing helium gas-compatible tubing I would be grateful for any = recommendations. Thanks, in advance. W. Dale Treleaven, Ph.D. Manager, NMR Facility Department of Chemistry Louisiana State University Baton Rouge LA, 70803 Ph. (225) 578-2667 ------_=_NextPart_001_01C835E2.6FD2D45C Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printableHelium recovery Greetings:
------_=_NextPart_001_01C835E2.6FD2D45C--
My email has decided to be a bit cranky so let me attempt to post
this note one more time.
Partly as a consequence of the increasing demand for helium and = growing
shortage of helium the NMR facility at LSU is considering putting in = a
helium recovery line to transfer helium gas to a proposed liquifier in = the
physics department. One major hurtle is the fact that the = physics
department is located approximately a block and a half from our 6
spectrometers. One solution, under consideration, is to push a = flexible
line through an existing conduit used for fibre optics. The = question
then arrises as to the permeability of different materials to helium = gas.
Our feeling is that polyethylene is too permable so we are = considering
the use of teflon or thick-wall PVC. If anyone has any experience = choosing
helium gas-compatible tubing I would be grateful for any = recommendations.
Thanks, in advance.
W. Dale Treleaven, Ph.D.
Manager, NMR Facility
Department of Chemistry
Louisiana State University
Baton Rouge LA, 70803
Ph. (225) 578-2667