Investigation Report
Dry Tree and Riser Descend on Constitution Spar
12-27-2017 18:45 G22987 GC 680 A (Constitution) Required Muster / >$25,000
- BSEE
- Investigation Report
- Unknown
- CorrosionDropped objectsStructural and asset integrity
- Inspection and maintenanceWell intervention
- Process pipework and pipelines
- Emergency responseExclusion zones
- Upstream oil and gas
- Offshore installation
Summary
Investigation of two related December 2017 incidents on the Constitution spar involving descent of a dry tree and riser. Corroded buoyancy-can air lines allowed nitrogen escape and seawater entry, reducing support and overloading deck grating. The report describes shutdowns, mustering, ROV damage assessment and inspections of similar systems.
Classifications: Corrosion; corrosion damage.
Classifications: Dropped objects; falling objects; DROPS.
Classifications: Structural and asset integrity; asset integrity; structural integrity.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Well intervention; workover; well servicing.
Classifications: Process pipework and pipelines; process piping.
Classifications: Emergency response; emergency preparedness.
Classifications: Exclusion zones; red zones; restricted access zones.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.