Re: [AMMRL] Purity of Helium Gas in a Recovery System #HeliumRecovery

From: <gregory.wylie_at_chem.tamu.edu>
Date: Fri, 31 May 2024 10:52:29 -0700

Hi Samrat

I have attached a few pictures of what we used to make our fittings etc.

We had our shop put threaded holes in KF50 blanks, 1 for the aviator pulls
for power and 1 threaded at 1/4" NPT on the outside and then 1/8" NPT on the
inside. The 1/4" is for the male quick disconnect on the outside and the
1/8" is for the 1/8" hose barb on the inside. The barb is 2mm since that is
what the tubing is for the pump. We did use dope on the threads and used
the epoxy on the aviator plugs as they are not air tight. We did test this
for leaks before settling on this method. We wired up the pump and the
connected the hose and slide them into the KF50 Tee's. There is one on the
incoming gas line to the bag and then one on the line going out of the bag
to the Bauer compressor in the basement. ( Our gas bag does have 2 ports one
for incoming and one for out going gas, so there is no way for us to pull a
vacuum on our magnets. The Bauer will shut off by itself it it ever fully
empties the bag by mistake.)

Power to the mini pumps is controlled by an arduino that is just letting each
one run for 15 minutes at a time. We do plan on some modifications so we can
control them manually from the control box and using the alarm levels of the
gas analyzer to have the arduino send us text messages if the impurities get
too high. Things to come when we have time to play. Currently we just have a
camera over the gas analyzer that we can look at to see the impurities.

We did find that we get better readings with the gas analyzer if it knows the
pressure. This unit does not come with that but we did put a pressure transducer
inline and an arduino takes its output and converts it to an input for the gas
analyzer. You can see this in the pictures with the analyzer. The input gases
comes into the analyzer on the tee side. The gas is put back into the gas bag
on the input side but about 6ft after the mini pump for the input gas. This way
the returning gas should not affect the reading of the input side. We have the
analyzer mounted on the cage that surrounds the gas bag.

Hope this answers some of your questions? I am happy to give more information
if needed. Our website goes over pretty much everything we have done except
for this stuff since it is newer.

Greg
Gregory P. Wylie, Ph.D
NMR Facility Manager
Texas A&M University
Department of Chemistry
P.O. Box 30012
College Station, TX  77843-3255
gpwylie_at_tamu.edu
979.458.0705 (voice)
979.845.4719 (fax)
706.206.0007 (cell)
http://nmr.tamu.edu


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Received on Fri May 31 2024 - 11:13:15 MST