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Challenge
Nobleseas have performed various engineering studies involving crane derating, modifications and retrofits to suit offshore environments.
The overall study scope is consist of following objectives:
- Perform the derating of non-offshore crane (shore rating to offshore rating)
- Perform stability checks while deriving acceleration, roll, pitch and yaw motions
- Derive the limiting wave heights and wind speeds for the lifting operation while keeping within crane SWL.
- Obtain verification and approval from Class of vessel
Scope
Foundation Design of 600T SWL Crane
Study Scope
The detailed scope of work involved following tasks:
- Design of deck structure for the installation of 600T crane
- Structural analysis of the modified scantlings
- Stability calculation (acceleration, roll, pitch & yaw motions) of the barge crane
- De-rating of the boom for offshore operation (shore rating to offshore rating)
- Design verified and approved as per the class of vessel (ABS)
150T Knuckle Crane FE Analysis
Study Scope
The detailed scope of work involved following tasks:
- FEM and analysis of crane pedestal structure for an OSV
- Check the structure as per DNV Offshore codes
- Proposed modifications in the design as per results while keeping the side shell of the vessel unchanged
- Design verified and approved as per the class of vessel (DNV)
50T A-Frame FE Analysis and Structure Optimisation
Study Scope
The detailed scope of work involved following tasks:
- Performed FEM and analysis of A- Frame foundation in ANSYS as per ABS Rule for a converted Well Intervention Vessel
- Performed eigen value nonlinear buckling analysis in ANSYS
- Optimised the structure for minimum steel weight
- Design verified and approved as per the Class of vessel (ABS)
