Investigation Report
Equinor – Statfjord A – investigation of oil leak after overpressurising storage cell
Equinor – Statfjord A – investigation of oil leak after overpressurising storage cell
- Havtil
- Investigation Report
- Unknown
- Barrier managementHydrocarbon releasePressure systemsProcess safetyStructural and asset integrity
- Fluid transferInspection and maintenance
- Operator displays and control interfacesProcess pipework and pipelinesStorage tanksValve
- Alarm managementEnergy and process isolationOperating and work proceduresPressure relief
- Upstream oil and gas
- Offshore installation
Summary
Investigation of sludge-cell overpressurisation at Statfjord A during filling with a ballast-water valve closed for maintenance. Concrete cracking released an estimated 150 cubic metres of oil and sludge to sea. The report examines inadequate overpressure barriers, isolation arrangements, alarm response and documentation that failed to reflect changed cell use.
Classifications: Barrier management; safety barrier management.
Classifications: Hydrocarbon release; hydrocarbon leak; oil and gas release.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Process safety; major accident hazards.
Classifications: Structural and asset integrity; asset integrity; structural integrity.
Classifications: Fluid transfer; fluid loading; fluid offloading.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Operator displays and control interfaces.
Classifications: Process pipework and pipelines; process piping.
Classifications: Storage tanks; atmospheric tanks.
Classifications: Valve; valves.
Classifications: Alarm management.
Classifications: Energy and process isolation; isolation; energy isolation.
Classifications: Operating and work procedures.
Classifications: Pressure relief; overpressure protection.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.