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Pioneering Spirit’s pipelay debut advances the technical boundaries of the industry, laying a dual 32-inch diameter pipeline system at depths exceeding 2200 metres through the Black Sea from Russia to Turkey.
Company: South Stream Transport B.V.
2200 m
Max water depth
Scope of work
- Mobilise vessels through the Bosporus
- Pre-lay route survey & seabed preparations (cable-crossing supports, dredging)
- Pipe haul from marshalling yards
- Pull-ins (2x through micro-tunnels at Anapa, Russia, 2x through open-cut trench at Kıyıköy, Turkey)
- Design, engineering & installation of dual 940-km, 32-inch pipeline system
- Post-lay span rectification works
- 4x above water tie-ins
- As-laid survey
- Flood, gauge, test, dewater & dry pull-in sections
Specials & challenges
- One of the most challenging pipeline projects ever attempted both in terms of design and manufacturing & construction
- Safe and efficient installation of the world’s first 32-inch pipeline system installed at water depths exceeding 2200 m
- Longest pipeline in Allseas’ history (up to 2018)
- Black Sea’s challenging subsea environment with high H2S values & seabed conditions with geohazard risks
- First-time above surface pipeline tie-ins executed by DP pipelay vessel (Lorelay)
- More than 138,000 welds on a total of 73,618 double joints installed
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