Investigation Report
Subsea Methanol Leak from Injection Tree Valve
06-27-2020 17:25 G27277 MC 503 Pollution - Incident >$25K
- BSEE
- Investigation Report
- Unknown
- Loss of containmentMechanical failure
- Inspection and maintenanceROV operations
- Process pipework and pipelinesValve
- Energy and process isolation
- Upstream oil and gas
- Subsea
Summary
BSEE investigates a subsea methanol leak at Mississippi Canyon 503 detected during scheduled maintenance. ROV diagnostics and photographs identified the methanol injection tree valve as the leak source. Internal seal leakage was considered likely, but the cause remained unconfirmed. Repairs included mechanical isolation and installation of a blind flange.
Classifications: Loss of containment; containment loss.
Classifications: Mechanical failure; equipment failure.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: ROV operations; remotely operated vehicle operations.
Classifications: Process pipework and pipelines; process piping.
Classifications: Valve; valves.
Classifications: Energy and process isolation; isolation; energy isolation.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Subsea; underwater worksite.