General information

ClientSouth Stream Transport B.V. 
LocationBlack Sea 
VesselsPioneering Spirit, Audacia 
Max. water depth2200 m (7200 ft)
Total length of pipe laid1802 km
Number of double joints installed73,618
Total number of welds138,249
Double joints259

Scope of work

  • Mobilise vessels through the Bosporus
  • Pre-lay survey of the route
  • Pre-lay seabed preparations (cable-crossing supports; dredging)
  • Pipe haul from marshalling yards
  • 4x pull-ins (2x through micro-tunnels at Anapa, Russia; 2x through open-cut trench at Kıyıköy, Turkey)
  • Design, engineering and installation of two 940-km, 32-inch pipelines
  • Post-lay span rectification works
  • 4x above water tie-ins
  • As-laid survey
  • Flood, gauge, test, dewater and dry pull-in sections

Project specials

  • Longest pipeline in Allseas’ history (to date)
  • First time 32-inch pipe installed in 2200 water depth
  • Transportation and installation of client-provided double-joints
  • First time above water tie-ins executed by DP pipelay vessel
  • 259 double joints requiring 518 welds, resulting in project-best 6.3 km pipe laid in 24 hours on 26 August 2018

Pipe characteristics

1778 / 9603239SAWL 450 FDU
90 / 483239SAWL 450 FDU
12 / 63239SAWL 450 FDU