Shell Cracker Blast: 6 Minutes from Wrong Click to $95M Explosion

The U.S. Chemical Safety and Hazard Investigation Board (CSB) last Wednesday, Sept. 16, released its final report on the June 4, 2025, explosion and fire at Shell Polymers Monaca, the ethane cracker plant in Beaver County, PA (see PA DEP Says Shell Ethane Plant Fire May Have Released Carcinogens). The finding, boiled down to one sentence: an engineer who had never done the job before opened the wrong valve on a computer screen where three nearly identical valves were stacked on top of each other, and six minutes later Furnace 5 blew apart. Damage: $95 million. Injuries: none. OSHA's fine: $26,480.

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