Investigation Report
Gas Leakage from Master-Valve Flange During Platform Renovation
12-18-2008 14:00 G02663 BA/A70 Tree bleeding gas
- BSEE
- Investigation Report
- Unknown
- Hydrocarbon releaseMechanical failureWell integrity
- Inspection and maintenance
- ValveWellhead
- Evacuation, escape and rescueEnergy and process isolation
- Upstream oil and gas
Summary
An investigation examines gas leakage from a well’s master-valve flange during platform renovation. Findings suggest installation over-torque weakened two bolts, with high-sea motion believed to contribute to failure. A closed subsurface safety valve limited the release. Personnel evacuated by boat before specialist repairs; no injuries or pollution were reported.
Classifications: Hydrocarbon release; hydrocarbon leak; oil and gas release.
Classifications: Mechanical failure; equipment failure.
Classifications: Well integrity; well life cycle integrity.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Valve; valves.
Classifications: Wellhead; well head.
Classifications: Evacuation, escape and rescue; EER; escape and rescue.
Classifications: Energy and process isolation; isolation; energy isolation.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.