Reply to post: Kill switches that go bang

Crash, bang, wallop: What a power-down. But what hit the kill switch?

Colintd

Kill switches that go bang

Rather than silence I can speak from personal experience about what happens if you hit the kill/field dump switch on an NMR/MRI machine. All the stored energy in the coil vaporises the liquid helium coolant, followed.by a very loud bang/woosh as several thousand pounds of now gaseous helium, with about x1000 volume goes up the vent pipe. Had to be done as some idiot had come in with a steel gas cylinder which was literally dragged off the trolley into the coil. Not an experience to be repeated. Try leaning near the kill switch if you go for an MRI and see the techs.reaction...

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