How subsea gas pipelines are laid

Millions of cubic meters of blue fuel are pumped through underwater gas pipelines all over the world every second. More than 6, 000 kilometers of gas pipes have been laid in the North Sea alone. The Nord Stream has been launched at full capacity, and the laying of the Turkish Stream pipes along the Black Sea bottom is about to begin. And this is a very difficult job.

Laying work begins with exploration of the seabed along the entire length of the future gas pipeline. Obstacles can be very different - from large boulders to sunken ships and unexploded ordnance. Depending on the complexity of the obstacles, they are eliminated or bypassed. The places where the pipeline is buried in the ground are also determined.

Following the "underwater reconnaissance" is, or rather sails, a pipe-laying vessel - a gigantic floating structure that directly places pipes on the seabed. A special conveyor is mounted on board, where pipes are welded. After checking the welds with ultrasound and applying a special anti-corrosion coating, the immersion begins.

It is carried out with the help of a special boom - a stinger, which ensures the immersion of pipes at a certain angle, excluding metal deformation.

Interestingly, pipe-laying starts at sea and can be carried out simultaneously in several sections, which are then connected to each other. The pipes laid in the sea are pulled ashore with the help of strong metal cables and then a "overlap" is made - a connection with the onshore part of the gas pipeline.