dws-alleseas-pioneering-spirit-770px-1Allseas' giant construction and pipelay vessel headed out from the port of Rotterdam, the Netherlands, on 13 May to the Black Sea to work on the installation of the TurkStream pipeline.

The twin-hulled, 382 m long and 124 m wide vessel just returned from lifting the top side of Shell’s Brent Delta platform in the North Sea and transporting it to a British scrapyard.

The vessel’s new job in the Black Sea consists of the installation of two, 900 km long pipelines on the seabed in water depth of 2.200 m.

dws-alleseas-pioneering-spirit-stinger-325px The 150 m stinger that leads the gas pipes to the bottom of the sea

For the job, the Pioneering Spirit has been equipped with a 150 m long Stinger, a frame that hangs behind the Pioneering Spirit.

On board of the Pioneering Spirit, pipe parts are welded together. Via a transition-frame the pipe is placed on the Stinger and rolls over the 'rollerboxes' into the water.

The Stinger leads the pipe to the bottom of the sea and guarantees the most ideal curvature of the welded pipe during the installation phase.

Gas pipeline
In December 2016, Allseas was awarded a contract to lay the first line of the TurkStream offshore gas pipeline in the Black Sea, with an option for laying the second line.

Allseas already started the pipelaying work with its Audacia vessel. Construction work for the pipeline in deepwater area will be performed by the Pioneering Spirit.

The offshore pipeline will consist of four parallel pipelines running through the Black Sea. The pipelines will enter the water near Anapa, on the Russian coast, and come ashore on the Turkish coast some 100 km west of Istanbul.

This news item is based on press releases published on the website of Allseas.

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More information
Allseas Engineering
Delft, the Netherlands
+31 15 268 1800