Investigation Report
D.D. Williamson & Co. Catastrophic Vessel Failure — Final Investigation Report
D.D. Williamson & Co. Catastrophic Vessel Failure — Final Investigation Report
- CSB
- Investigation Report
- ExplosionLoss of containmentPressure systemsProcess safetyRegulation and legislation
- Pressure vesselValve
- Management of changeOperating and work proceduresPressure reliefRisk assessment
- Downstream and process industries
- Onshore facility
Summary
CSB investigates a fatal spray dryer feed tank explosion and subsequent aqua ammonia release at DDW. The tank most likely failed through overheating and excessive pressure. Analysis examines missing pressure relief, vessel certification, equipment changes, inadequate hazard evaluation and operating guidance, with recommendations for safeguards and operator training.
Classifications: Explosion; explosive atmospheres.
Classifications: Loss of containment; containment loss.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Process safety; major accident hazards.
Classifications: Regulation and legislation; safety legislation; regulatory requirements.
Classifications: Pressure vessel; pressure vessels.
Classifications: Valve; valves.
Classifications: Management of change; MOC; change management.
Classifications: Operating and work procedures.
Classifications: Pressure relief; overpressure protection.
Classifications: Risk assessment; hazard assessment.
Classifications: Downstream and process industries; refining; petrochemicals.
Classifications: Onshore facility; onshore plant.