Swiss-based marine construction specialist Allseas has won a contract for the installation of pipelines and integrated structures for the second stage of Equinor’s Troll Phase 3 project.
The Troll Phase 3 project is supposed to accelerate production and contribute to maintaining the high production capacity utilisation of the Troll A Platform and the Kollsnes onshore plant towards 2030.
This phase of the development will enable gas production from the Troll West field via subsea tiebacks to the original Troll A platform some 80 kilometres northwest of Bergen, Norway.
For the second stage, Allseas will install a 28-kilometre, 36-inch concrete-weight-coated gas line parallel to the Stage 1 pipeline, installed by the company’s pipelay vessel Solitaire in 2020. The new pipeline will contain three inline tees, one for future tie-in flexibility.
The latest Troll award includes the fabrication and assembly of multiple pipeline heads and the inline tees, installation and retrieval of counteracts, and flooding, cleaning and gauging of the pipeline system. Execution is planned using the giant construction vessel Pioneering Spirit in 2026.
