We don’t provide the LN2 fire smothering guidance on our campus.
We have Metal X extinguishers available. When I’ve done this exact mistake in the past I left in it a large beaker the hood until the fire burned out..
Russell Vernon, Ph.D.
Environmental Health & Safety
University of California, Riverside
900 University Ave
Riverside, CA 92521
Direct (951) 827-5119
Admin (951) 827-5528
Fax (951) 827-5122
I’m reviewing an incident report from one of my inorganic synthesis researchers. A little sodium, wiped off tweezers onto a kimwipe and not properly disposed, that went badly downhill. No one hurt but it sure got everyone’s heart pounding for a bit.
In the corrective action, the lab worker states they keep LN2 nearby as an extinguishing agent for small air/reactive metals fires (think size of a beaker). That just sounds all bad. In my guidance document, I state that dry sand, Met-L-X, lime, or soda ash are suitable extinguishing agents for small fires. We have our own fire department and don’t provide Class D fire extinguishers (for a long list of very good reasons).
I’m getting some push back – that using LN2 is commonplace in this lab and the default fire extinguishing agent.
Debbie M. Decker, CCHO
Campus Chemical Safety Officer (soon to be Chemistry Department Safety Manager)
Environmental Health and Safety
University of California, Davis
1 Shields Ave.
Davis, CA 95616
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