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 Project description:
- Tyrihans is tied back to the Kristin A floating platform in the Norwegian Sea, about 200 km west of Sandnessjøen. The field is operated by Statoil.
- The world’s longest DEH-equipped pipeline, installed in 2007-2008.
Challenges of the project:
- The largest and longest pipeline with DEH ever, 18 inches/44 km, involved unique challenges in terms of cable design.
- Highest voltage for DEH ever, 52 kV.
- Stricter requirements for mechanical stress on the cable (trawling and pipe movements).
- New installation methodology in DEH context (S-lay).
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Nexans' solution:
- Qualified XLPE insulation for 52 kV with wet design (cannot use metallic screen for DEH).
- Coaxial design for DEH Riser Cable and Armoured Feeder Cable (patented lower loss solution).
- Semi-conducting sheath system for Piggyback Cable for handling charging currents.
- New method for connecting coaxial cable to pipeline (patented solution).
- First field with continuous monitoring system integrated into Piggyback Cable (patented solution).
- External trawl protection for Piggyback Cable; Mechanical Protection System (patented solution in cooperation with Statoil).
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