Two days ago, while off campus, colleagues helped receive a 100 L dewar of
liquid helium. Today, I checked the dewar and found the safety valve off.
Opening it released a lot of pressure, so I opened the side vent, and a 2
meter jet of helium shot out for a few minutes. Thankfully, no one was near
the vent. None of the valves were shrink-wrapped, and my colleagues said
they didn’t touch them. I know the tank has blast safety burst caps,
so it’s unlikely it would explode, but it was disturbing. I am guessing
that if the burst cap had ruptured after we took the dewar, we’d
have had to replace the helium. It’s also strange that FedEx could
transport liquid helium.
In any event, I am curious to know if others in this group have received a
liquid helium dewar with the safety valve off? And is it common to get deliveries
of liquid helium by FEDEX (box truck)?
Brian
--------
Brian Myers, Ph.D.
Professor of Chemistry
Meyer Hall of Science (rm 256)
Ohio Northern University
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Received on Sat May 10 2025 - 06:55:03 MST