From the Compressed Gas Association:
Heavy leather protective gloves, safety shoes, aprons, and eye protection must be worn to prevent possible contact with . . . the cold liquid or boil-off vapors which may result from spilled or splashed liquid.
Equipment and systems designed for the storage, transfer, and dispensing of cryogenic liquids . . . must be equipped with pressure relief devices to prevent excessive pressure buildup do to the vaporization of the cryogenic liquid as heat leaks into the system.
This topic seems to have skidded off course. The cryogenic properties of LN2 have no bearing on how some guy in germany lost his hands mishandling the stuff.
The last major incident I could find involving LN2 was a midnite explosion at Texas A&M where the tanks were old, decrepit, and had improperly installed stress relief valves.
It would appear to me that this guy had somehow put the LN2 under pressure or caused it to expand to a volume greater then his container could release the pressure. We can only guess as to what he was doing, but several reports I read indicated that he had taken the LN2 into the bathroom where the container "Blew up". I can only guess that the guy must have added a too warm liduid to the LN2 container to get that type of effect. Or maybe he attempted to flush the LN2 to dispose of it after he was finished using it and it became compressed in the pipe after passing the elbow shaped gas trap.
Edited by RAHiggins1, 16 July 2009 - 08:17 AM.