CSB Report: Undersized Pressure Relief System Caused Fatal 2024 Reactor Explosion
According to Safety+Health Magazine, the U.S. Chemical Safety Board has released a final report on a November 2024 explosion at the Givaudan Sense Colour facility in Louisville, KY, that killed two workers and seriously injured three others when a batch reactor vessel exploded during food coloring production.
What Happened and What CSB Found
The CSB investigation determined that pressure accumulated inside the reactor vessel could not be adequately released because the emergency pressure relief system was undersized, needing to be four times larger than what was in place. The board also found that Givaudan did not fully understand the reactive hazards of the ingredients involved in the coloring process. The explosion destroyed the facility and caused extensive property damage to the surrounding community.
“This tragedy demonstrates that companies handling reactive chemical processes must fully understand the hazards of their materials, implement effective safeguards, and ensure that workers and surrounding communities are protected from catastrophic events,” said CSB member Sylvia Johnson.
The board issued multiple recommendations, including calling on OSHA to amend its process safety management standard (1910.119) to more comprehensively address reactive hazards. CSB also repeated a recommendation to the EPA to revise accidental release prevention requirements to explicitly cover catastrophic reactive hazards, including those from self-reactive chemicals and process-specific conditions.
What It Means for Subcontractors
Industrial maintenance and process equipment subs working at chemical, refining, or manufacturing facilities should take note of the CSB’s specific lessons:
- Verify that pressure relief systems on any vessel you are servicing or installing are properly sized for the actual operating conditions, not just nominal design specs.
- Investigate any unexpected temperature or pressure changes during a job. The CSB explicitly flags these as potential indicators of chemical reactions that require further hazard analysis before work continues.
- Do not rely solely on Safety Data Sheets for chemical hazard information. The CSB recommends supplementing SDS data with additional hazard analyses, particularly for reactive materials.
- Confirm that visual and audible alarms tied to safe operating limits are functional and that workers on site know the established response protocol before starting work.
- Ensure hazard analyses are current and revalidated on industry-recommended timelines. Outdated assessments are a liability in process safety environments.
