This week marks 20th anniversary of deadly chemical plant blast in Pennsylvania

conceptscience The destroyed Concept Sciences building and damaged other buildings in the Hanover Township industrial park.
Twenty years ago this week a chemical plant explosion in Pennsylvania killed five and injured six, becoming one of the first major investigations conducted by the newly established U.S. Chemical Safety and Hazard Investigation Board. The explosion occurred at Concept Sciences Inc., near Allentown, PA, on February 19, 1999. As a result of the explosion four Concept Sciences employees and the manager of an adjacent business were killed. Two Concept Sciences employees were injured, as were four people in nearby buildings. The explosion damaged ten buildings and several residences in the immediate area. The case study found that the explosion was most likely due to high concentration and temperature in a process vessel containing several hundred pounds of hydroxylamine, a potentially explosive chemical used in the manufacture of semiconductors. Concept Sciences' process safety management systems were insufficient to properly address the hazards inherent in its manufacturing process. The case study added...
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