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Dredging for Subsea 7 in the North Sea
Sales Enquiry
- Supplying pumping equipment to raise the Costa Concordia
- Halliburton fibre optic yard trial
- Bespoke flange stud cutting for Subsea 7
- Brent Alpha caisson repair
- Haewene Brim, Bluewater, mooring wire replacement
- Tetney sea line maintenance project
- Equipment spreads for Hess South Arne and IVRR
- Supporting Fugro Subsea Services Ltd. with equipment deployment in the North Sea
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- Dredging for Subsea 7 in the North Sea
- Full back deck provision for Technip IRM campaign
- Subsea 7 - BP West Nile Delta gas development
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- Installing and commissioning FPSO winch package alongside Bibby Offshore
- Provision of deck and subsea equipment for Hibernia Southern Extension project
- Gryphon Alpha FPSO winch and line monitoring package
- Enabling riser pull-in on the Dunlin Alpha platform
- BP Clair fibre optic installation
- Electrical umbilical pull-in for Callater Field development
- Undertaking preventative winch maintenance for Ensco
- JFO provides bespoke solutions on complex project off the Ivory Coast
- James Fisher Offshore supports Subsea 7 in Gorgon project
- Recovery and reinstallation of Ocean Installer mooring lines
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- Lancaster EPS Project
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- Cutting, dredging and recovery demonstration
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- DeepOcean Ghana, TEN project
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Dredging for Subsea 7 in the North Sea
Scope of works:
Subsea 7 required dredging to remove rock dump, sandy trench backfill and natural seabed beneath an existing 8” ID flexible pipeline. Suitable clearance was also required to allow the operation of a diamond wire saw to then cut out manageable sections of the pipeline for recovery.
Scope of supply:
- 2 x diamond wire spreads
- 2 x dredge spreads (6" and 10")
- Shared hydraulic power unit (HPU) and control/reeler
- Experienced technicans
The 6" and 10" dredgers were well received by the divers with regards to performance and manoeuvrability although it was noted that the addition of a swivel head on the tiger tail would allow for better handling. Following the client feedback, a new swivel head was designed and built within two weeks of this information being received.
