At 12:30 p.m. on February 20, 2020, Employee #1, employed by a structural steel fabricator and erector company, was entering a tank to clean it. The tank had a combination of Ecocure II and methyl ethyl ketone (MEK) residues and had been purged with nitrogen. Employee #1 entered the permit required confined space that contained the residual chemicals and nitrogen to perform the cleaning operations. She was overcome by the oxygen deficient atmosphere. Employee #2, employed by a chemical distribution company, entered the tank to make a rescue attempt for Employee #1. He was also overcome from the oxygen deficient atmosphere. Both employees were killed by asphyxiation.
Source:osha.gov
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