Client: Boskalis Subsea
Project: Repsol Claymore 6" Flexible Replacement
Scope: Installation analysis, tie-in spool lift checks, rigging design and dropped object assessment
Vessel: Boka Atlantis
Project Overview
Elgenio provided onshore engineering support for replacement of a 6", approximately 750 m gas import flexible flowline between the Claymore Platform and the Gas Import ESD Valve Skid.
The scope included OrcaFlex installation analysis for initiation, lay and laydown, structural and rigging checks for the tie-in spool lift, and dropped object assessment for the offshore installation campaign.
The Challenge
The installation required several distinct offshore operations to be developed around the vessel configuration, flexible product behaviour, subsea interfaces and lifting requirements.
Installation loads and geometry had to be assessed through the different phases of the operation, while the associated tie-in spool lift required structural verification and a suitable rigging arrangement.
The scope also required assessment of dropped object risk to understand the potential interaction between dropped items and existing subsea infrastructure.
Engineering Scope
- OrcaFlex Initiation Analysis
- Flexible Lay Analysis
- Laydown Analysis
- Tie-In Spool Structural Checks
- Rigging Design
- Lift Load Definition
- Dropped Object Analysis
- Drop Cone Hit Probability Assessment
The Solution
Elgenio developed the installation analysis in OrcaFlex to assess the behaviour and governing loads of the flexible flowline during initiation, lay and laydown.
The analysis results were used to support development of the offshore installation method and confirm the loading requirements for the selected vessel and equipment.
Structural checks and rigging design were completed for the tie-in spool lift, providing a practical lifting arrangement for offshore handling and installation.
A dropped object assessment was also undertaken in accordance with DNVGL-RP-F107, including drop cone hit probability assessment for relevant subsea infrastructure.
Results
Defined Installation Loads
OrcaFlex analysis established the governing loads and behaviour through initiation, lay and laydown.
Verified Lift Arrangement
Structural checks and rigging design supported safe offshore handling of the tie-in spool.
Subsea Risk Assessment
Dropped object assessment quantified potential interaction with existing subsea infrastructure during the campaign.
Installation Analysis & Offshore Engineering
Related Services
Dynamic Analysis
OrcaFlex analysis for flexible installation, load definition and offshore operability assessment.
View serviceLift Planning & Review
Structural lift checks, rigging design and technical review for offshore handling and installation operations.
View serviceProject Engineering & Mobilisation Support
Engineering support for installation planning, vessel interfaces and offshore execution.
View serviceNeed engineering support for a flexible or subsea installation campaign?
Elgenio can support installation analysis, lift engineering, dropped object assessment and offshore project execution from planning through delivery.