WorleyParsons has a proven track record in the design of large integrated topsides exceeding 25,000 tonnes installed weight. We are fully conversant with the detailed design challenges associated with large integrated topsides and the critical items requiring specific consideration including:
- Safety in Design
- Installation method
- Weight and centre of gravity estimation and control
- Drilling facilities design and integration
- Integrated and traditional modular living quarters design
- Optimizing design for fabrication by Asian yards
Float-over Installation
Since it’s inception, float-over deck installation has become a common place solution. The single integrated deck offers many advantages over the more traditional modular construction, which requires the use of heavy lift barges. Such advantages include:
- 100% platform completion at fabrication yard with minimal offshore hook-up
- Elimination of the heavy lift vessel requirement
- Single stage installation of 10,000+ tonne topsides
WorleyParsons has a long history of involvement in the development and implementation of integrated deck float-over installations. We have been instrumental in the development of the analysis and engineering techniques required to expand the range of applicability of the float-over installation.
Our extensive experience ensures that the many fundamental issues associated with the overall configuration of the integrated deck structure are thoroughly assessed and established during conceptual design, when incorrect decisions can severely limit the ability to achieve an effective float-over operation. In considering a float-over deck operation, careful and early consideration needs to be given to:
- Topsides equipment layout
- Deck weight and centre of gravity, allowing for growth contingency
- Deck installation height, including the potential requirement for post installation jacking
- Barge suitability/availability (including barge stability and barge strength)
- Jacket and deck leg spacing
- Deck transportation stability and motion responses
- Platform orientation for alignment with prevailing wave/swell direction
- Sea-state conditions (transportation and float-over operations)
- Guiding/fendering
- Load transfer and support removal
