In 2013, the concrete planning of one or two further 1250 km long strings with a 1200 mm diameter, essentially parallel to the two existing strings, from Russia to Germany (landing point Lubmin or Vierow) began. With the construction of the other two strings, the Nord Stream Pipeline’s annual capacity would double to 110 billion cubic meters of gas. The feed pressure is 220 bar on the Russian side and 110 bar on the German side. The wall thicknesses are adapted to this pressure curve.
A total of 200,000 pipes, every twelve meters in length and weighing around twelve tons, were required for the (previously) two-strand pipeline. The first line was supplied with 75,000 pipes by Europipe (Mülheim / Ruhr) and 25,000 pipes by the Russian manufacturer OMK (Wyksa). Every week, 15 freight trains with 100 pipes were driven through Germany by DB Schenker Rail to the Sassnitz (Mukran) ferry port. In Russia, the large pipes were transported by the RŽD to the Finnish seaport of Kotka.
Special works in both seaports provided the steel pipes with concrete. So they were made to double their mass of 25 t to ensure that the pipes did not float despite the buoyancy of the gas. In this way, the pipes weighed down were shipped from Mukran to the Swedish interim storage facilities at Karlskrona and Slite, and from Kotka to the Finnish interim storage facility in Hanko. A total of five pipe bearings was chosen so that the distance to a pipe laying point did not exceed the 100 nautical miles mark. This allowed the number of pipe feeder ships to be limited to three. The laying of the first line began in spring 2010 with a special pipe-laying ship.