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
Oseberg Transport System Oseberg Transport System Oseberg Transport System (OTS) () is a pipeline system in western Norway. It is long and runs from Oseberg, Veslefrikk, Brage, Frøy and Lille-Frigg to Sture terminal, located north of Bergen, Norway. The operation of the pipeline was commenced in 1988. Total investment in the pipeline construction was about 9.8 billion NOK. The pipeline is placed in a tunnel close to the coast line. The tunnel is long and its opening is at depth of . The pipeline diameter is . The capacity of OTS is . Operating life is expected to be nearly 40 years The