Investigation Report
Riser-Guard Failure at Matterhorn Tension-Leg Platform
04-09-2026 0800 G19931 MC 243 A Incident >$25K - Structural Damage
- BSEE
- Investigation Report
- Unknown
- CorrosionMaterial fatigueStructural and asset integrity
- Inspection and maintenanceLifting operationsRigging
- Positive retention and reliable securing
- Upstream oil and gas
- Offshore installationSubsea
Summary
BSEE investigates riser-guard failure at the Matterhorn tension-leg platform on 9 April 2026. Fatigue cracking affected three hull connections, with degradation overlooked because the guard was excluded from targeted inspections. The report describes securing, underwater inspection and recovery operations, followed by marine traffic protection for exposed risers. No injuries or pollution occurred.
Classifications: Corrosion; corrosion damage.
Classifications: Material fatigue; metal fatigue.
Classifications: Structural and asset integrity; asset integrity; structural integrity.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: Rigging; slinging.
Classifications: Positive retention and reliable securing.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.
Classifications: Subsea; underwater worksite.