Traditional landfall solutions at the western coast of Norway have been performed by use of piercing chambers excavated in hard rock below seabed designed as rock caverns. Large concrete plugs were constructed as barriers to sea. The traditional pull-in operations have been performed with assistance from divers and with the linear winch located on the lay vessel, i.e. the hold back forces supported by the lay vessel will be doubled. The new solution developed at Kalst~ has no concrete plugs, but utilise the rock as a barrier against the sea and also as a pipeline anchor. The linear winch is located inside the piercing chamber.
The Åsgard project was established to utilise the 212 billion Sm3 natural gas and 132 million m3 crude/condensate located under the seabed in the Norwegian Sea at the Åsgard field. The new landfall solution at KalstØ is developed for the Åsgard Transport gas transportation system. The sales gas is to be processed for sale in Europe. The main elements to be developed within the Asgard project are, ref. Fig. 1:
Åsgard field, approximately 200 km outside the coast of Norway
Åsgard Transport is the transport system between the field and the processing plant at KåstØ, i.e. import system.
Åsgard plant at KårstØ
Europipe II is the transport system between the processing plant and Dornum, Germany, i.e. export system.
The landfall at KålstØ is a part of the Åsgard Transport system with the following main elements:
Export Riser Base at the Åsgard B platform
684 km offshore pipeline
Landfall section of 1013 m pipeline between tie-in to the sea pipeline and the LVS (Landfall Valve Station) * LVS at KalstØ * 21 km onshore pipeline including 3 fjord crossings