Investigation Report
Two Subsea Xylene Releases During Marco Polo Operations
01-15-2025 1000 G18402 GC 608 Pollution, Incident >$25k
- BSEE
- Investigation Report
- Unknown
- Environmental protectionHuman factorsLoss of containmentMechanical failure
- DecommissioningPressure testing
- Valve
- Competence and trainingLockout and tagoutOperating and work proceduresSafety communication
- Upstream oil and gas
- Subsea
Summary
BSEE investigates two subsea xylene releases associated with Marco Polo operations in January 2025. The first involved failed seals in an inline logic cap unsuitable for xylene service; the second followed an uncommunicated replacement delay caused by weather. Corrective actions included a suitably rated cap, revised isolation procedures and personnel retraining.
Classifications: Environmental protection; environmental safety; pollution prevention.
Classifications: Human factors; human performance; ergonomics.
Classifications: Loss of containment; containment loss.
Classifications: Mechanical failure; equipment failure.
Classifications: Decommissioning; facility dismantling.
Classifications: Pressure testing; hydrostatic testing; pneumatic testing.
Classifications: Valve; valves.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Lockout and tagout; LOTO; lockout/tagout.
Classifications: Operating and work procedures.
Classifications: Safety communication; toolbox talk; toolbox talks.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Subsea; underwater worksite.