Construction of the Trans-Alaska Pipeline System with the Denali Fault, a major cause of earthquakes, and with large amounts of permafrost. In 1969, the unincorporated Trans-Alaska Pipeline System group drilled a series of core samples north of the Brooks Range that demonstrated how ubiquitous the permafrost was along the route. This forced the design of an elevated pipeline, which was tested in a loop built near Barrow. This elevation required the pipeline to be insulated, since extreme cold temperatures caused the metal to become brittle, even when hot oil was being pumped through the pipeline. After ecological objections forced subterranean pipeline crossings (in order to allow
NOGAT Pipeline System NOGAT Pipeline System NOGAT ("Northern Offshore Gas Transport") is a natural gas pipeline system which connects Dutch continental shelf with an onshore gas plant and terminal at Den Helder, the Netherlands. The system has been operational since 1992. The Danish continental shelf pipeline system is connected to the NOGAT through the Tyra West – F3 pipeline and the German continental shelf pipeline system is connected to the NOGAT through A6-F3 pipeline. NOGAT is owned by NOGAT BV, in which the 45% interest is held by Energie Beheer Nederland B.V. (EBN), a Dutch state-owned company, 48.3% is owned by GDF Suez,