Total Laggan

General information

Client Total Exploration & Production UK 
Project Total Laggan 
Year 2011–2013 
Location Onshore Shetland Islands and offshore east and west of Shetlands 
Vessels Solitaire, Audacia, Calamity Jane 
Max. water depth West of Shetlands 640 m (2100 ft)
West of Shetlands 640 m (2100 ft)

Scope of work

  • Detail design and engineering
  • Procurement and supply
  • Construction
  • Onshore installation of 2x 18” flowlines, 1x 2” and 1x 8” lines, umbilical and a 6-km 30” export line
  • Landfalls of 2x 18” flowlines and 1x 30” export pipeline
  • Offshore installation of 2 parallel 18” flowlines (141-km each) and a 225-km 30” export pipeline,
    all complete with inline valve structures
  • Installation of overtrawlable protection structures for the inline valve structures
  • Survey support
  • Logistics
  • Rock dumping
  • Flooding, cleaning, gauging and testing

Project specials

  • Installation of 6-off over-trawlable structures at 600 m water
    depth
  • Onshore installation of pipelines and umbilical in environmentally challenging conditions

Pipe characteristics

227 / 141 30 20.4 / 32.9 DNV 450 FDU (UOE)
282 / 175 18 25.4 / 27.3 DNV 450 FDU (UOE)
2.5 / 1.9 10 22.7 PE 80 SDR11
5 / 3.8 30 32.9 DNV 450 FDU (UOE)
4 / 2.9 18 27.3 DNV 450 FDU (UOE)
2 / 1.45 12 22.7 PE 80 SDR11
2 / 1.45 8 19.3 DNV 450 DU (SMLS)
2 / 1.45 2 5.5 CR22 Duplex U (SMLS)