The Scope
Woodside’s Persephone project is a tie-back of a subsea step out well to their North Rankin A Platform. As part of their OPREP process, Woodside required an “AC4” – an assurance check – for their Persephone Riser design to support their financial investment decision (FID).
The Outcome
Cube Offshore worked closely with Atteris to conduct a thorough review of structural aspects of the Persephone Risers design to support Woodside’s AC4 assurance checks. Cube Offshore identified risks and opportunities where improvements could be made. Recommendations were made to minimise risks and maximise the opportunities identified.
Structural aspects included:
- design basis
- lessons learnt from Echo Yodel and PoG
- fatigue
- dropped object
- constructability/installability
- clamp design
- riser supports and guides
