AMMRL: Helium recovery

Dale Treleaven (wtrelea@lsu.edu)
Mon, 3 Dec 2007 13:26:43 -0600


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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

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Helium recovery




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
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

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