Construction of the Trans-Alaska Pipeline System for a fifth, should it become necessary. Holding tanks were planned that had a capacity equal to that of the pipeline, allowing the whole pipeline to be emptied if required. As required by the Pipeline Authorization Act, a ballast-water filtration system had to be designed as well. This system removes oil from tankers' ballast water so it is not released into Prince William Sound—something fishermen feared when the pipeline was proposed. Shortly after the permit was signed, convoys of equipment on snow tractors began heading north, using hardened snow roads and an ice bridge over the Yukon River to reach
Oseberg Transport System OTS is operated by Statoil and includes other licensees 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