Hi Brian,
We receive our liquid Helium from the Messer plant in Vancouver Washington
via overnight FedEx Freight. We receive deliveries every 15 weeks. I have
been here since 2014 and we have never had any issues with the tanks other
than one 100 liter tank which came in near 75 liters as opposed to the
"normal" of about 95 liters. That shorted tank happened under the Defense
Logistic Agency Program and it was really hard to get that corrected since
they insisted on a calibrated scale weight which I could not provide.
During the conference call with about 5 of their folks on the line I was
told dipping a tank was something they never heard of.
The Vancouver plant has been excellent in their deliveries and nearly every
one has had the shrink film holding the valves in place. The low pressure
relief valve (the smaller one) should be closed when the tank arrives and
only the higher pressure valve should be active.
Regarding N2 versus Helium in a truck, I only know of one death from either
gas in a magnet related situation and that occured during a cool down of a
mobile magnet many years ago and the first person who attempted to provide
aid passed out but was removed from the truck before they died. I would
expect that N2 is slower to clear a truck than Helium since once the door
is raised the driving force for the helium to escape should be very high
given its extremely low density. Plus if the person in the truck should
happen to be experiencing a high level of Helium gas and happened to make
any comment I would hope they would catch the high pitch of their voice.
I have always met our FedEx driver outside of the building when he arrived
to facilitate the delivery process. I never thought about the fact that it
would provide an extra level of safety for the driver.
Regards,
Joe
*******************************
Joe Dumais, Ph.D. (retired)
Associate Research Professor-Emeritus
Nuclear Magnetic Resonance Spectroscopist
Boise State University
College of Arts and Sciences
Department of Chemistry and Biochemistry
1910 University Drive, Boise, Idaho 83725-1520
(208) 426 4913
https://www.boisestate.edu/chemistry/
*******************************
“The best that most of us can hope to achieve in physics is simply to
misunderstand at a deeper level.” -*Wolfgang Pauli*
On Mon, May 12, 2025 at 10:58 AM clarkson.michael via groups.io wrote:
> I have occasionally received helium dewars with their valves in unsafe
> position -- in all cases these were 100 L dewars. Many deliveries use
> common carriers: I've had Linde/Praxair deliveries come by ODF and XPO
> trucks and the point of delivery drivers frequently lack real safety
> training for cryogenic gases. Never seen FedEx before but it doesn't really
> surprise me. As others have suggested, the best way to deal with it is to
> bleed pressure slowly via the vent valve. If you have a method of doing so,
> report the situation to the supplier.
>
>
>
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Received on Wed May 14 2025 - 06:36:55 MST