Pioneering Spirit. Photo: Allseas Group
BP has chosen Allseas to carry out the subsea pipelay work for its ultra-deepwater Greater Tortue Ahmeyim (GTA) natural gas project off the coast of Mauritania and Senegal.
Scheduled for early December 2023, Allseas will conduct the GTA offshore pipelay works using its world-renowned construction vessel, Pioneering Spirit. The company’s offshore construction support vessel, Oceanic, will provide installation support.
The Pioneering Spirit is not only the largest and most capable heavy-lift construction vessel but also the world’s largest pipelay vessel, with an impressive S-lay tension capacity of 2000 tonnes.
Under the contract, Allseas will install approximately 75 kilometres of outstanding export pipelines, including field termination assemblies (FTAs), in water depths ranging from 1,500 to 2,800 metres. Additionally, they will lay four 10-inch CRA infield lines, with FTAs up to two kilometres long, in 2,800 metres of water.
The installation of the pipelines and subsea structures is a highly complex task that requires meticulous planning and execution. The commercial and engineering teams from bp and Allseas have worked to evaluate the technical feasibility of installing the pipelines and subsea structures, originally designed for a J-lay solution.
“This agreement demonstrates both our willingness and ability to take on highly complex and pipelay projects with fast-track planning and execution scopes,” said Pieter Heerema, Chief Executive of Allseas. “We are excited to work with bp on this project, as it re-establishes the partnership between our two companies and creates a platform for future collaboration and growth.”
Allseas say its Pioneering Spirit is well-suited for the installation of mixed-diameter pipelines and subsea structures in ultra-deepwater. With a remarkable 2,000-tonne tension holding capacity, the vessel will be equipped with a special 1,000-tonne J-mode installation frame, designed in-house and built at Allseas’ fabrication yard in the Netherlands, to install the 10 FTAs.
As pioneers of dynamically positioned S-lay technology, characterized by its fast installation speeds in all water depths, Allseas has successfully installed over 27,500 kilometers of pipeline worldwide.
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