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Engineering and installation of ~500 kilometres of mixed diameter pipelines for the innovative “subsea-to-shore” tie-back system connecting the Laggan and Tormore fields with the new gas processing at Sullom Voe, Shetland Islands.
Company: Total Exploration & Production UK
Location: West of the Shetland Islands, U.K. North Sea
600 m
Max. water depth
Scope of work
- Detail design & engineering
- Procurement, logistics & supply
- Landfall construction at Orca Voe & pull-ins for 2x 18-inch flowlines and 30-inch export pipeline
- Installation of parallel 142-km, 18-inch flowlines (incl. ILTs)
- Installation of & 225-km, 30-inch export pipeline (incl. ILTs)
- Fabrication and installation of protection structures for ILTs and FLETs
- Construction of onshore export pipeline from gas plant to Firths Voe and import pipelines from Orca Voe to gas plant
- Survey support
- Rock dumping
- Flooding, cleaning, gauging & testing
225-km
30-inch export pipeline
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Specials & challenges
- Installation of 6x ‘overtrawlable’ protection structures at 600 m water depth
- Onshore construction of pipelines
- Environmentally challenging conditions
6x
‘overtrawlable’ protection structures at 600 m water depth
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