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At approximately 7:15 p.m. on January 17, 1990, Employees #1 and #2 were working on the third floor of the Reagent Building and mixing the following three compounds: magnesium powder (metallic), calcium carbide, and sodium chloride. Employee #3 was bringing in drums of magnesium powder. Employees #1 and #2 were using a length of steel pipe to loosen a blockage in a magnesium batching hopper. The pipe caused a spark to ignite a magnesium powder flash fire and explosion. Employees #1 and 2 were killed and Employee #3 was injured.
work rules, clogged, explosion, flashback, spark, combustible dust, hopper
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