Investigation Report
Equinor – Aasta Hansteen – investigation of gas leak
Equinor – Aasta Hansteen – investigation of gas leak
- Havtil
- Investigation Report
- Unknown
- Barrier managementFunctional safetyHydrocarbon releaseMechanical failurePressure systems
- Inspection and maintenancePressure testing
- Gas detectorProcess pipework and pipelinesValve
- Fire protectionFunctional testingIgnition source controlPressure relief
- Upstream oil and gas
- Offshore installation
Summary
The PSA investigates a gas leak from a rupture-disc holder in Aasta Hansteen’s high-pressure flare system. It examines disc installation, bolt clamping, piping alignment and inconsistent flare-valve opening requirements. The combined leak rate was assessed as exceeding 0.1 kg/s. A subsequent similar incident leaves the relative importance of causal factors uncertain.
Classifications: Barrier management; safety barrier management.
Classifications: Functional safety; safety instrumented systems; SIS.
Classifications: Hydrocarbon release; hydrocarbon leak; oil and gas release.
Classifications: Mechanical failure; equipment failure.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Pressure testing; hydrostatic testing; pneumatic testing.
Classifications: Gas detector; gas monitor; gas detection instrument.
Classifications: Process pipework and pipelines; process piping.
Classifications: Valve; valves.
Classifications: Fire protection; fire suppression; fire detection.
Classifications: Functional testing; function test.
Classifications: Ignition source control; ignition prevention.
Classifications: Pressure relief; overpressure protection.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.