Refinery Shutdown Explosion The Hidden Danger of Transient Operations

What happens when a refinery shuts down, but the hazards remain active? On April 26, 2018, a planned shutdown at the Husky Superior Refinery led to a major explosion, vessel failure, flying debris, an asphalt fire, worker injuries, and the evacuation of nearby residents. This video examines how changing pressures, worn equipment, missing steam barriers, incomplete purge arrangements, weak shutdown procedures, and gaps in process knowledge allowed air and hydrocarbons to mix inside the fluid catalytic cracking unit. The incident shows why startup, shutdown, maintenance, and other transient operations require the same level of attention as normal production. Key lessons covered include: • Managing reverse flow during shutdown • Maintaining effective steam and pressure barriers • Understanding the limits of slide valves • Reviewing procedures against technology guidance • Improving process hazard assessments • Applying lessons from previous industry incidents • Strengthening mechanical integrity and emergency planning This video is intended for HSE professionals, process safety engineers, plant operators, supervisors, maintenance teams, and industrial managers. For more practical HSE and process safety videos, subscribe to HSE Information Center. #ProcessSafety #RefinerySafety #HSE #IndustrialSafety #SafetyTraining