At 5:00 p.m. on February 4, 2021, an employee was working for a firm that manufactured fabricated structural metal. He was performing abrasive blasting with steel shot. He was wearing a supplied air respirator (SAR). While using the supplied air hood, he lost consciousness.
A pressure testing operation downstream on the plant airline allowed nitrogen to backfill into the compressed air line.
This test introduced an asphyxiant into the system.
The employee was killed.