North Slope: To compensate for expansion of the pipe caused by the warm oil, and to permit movement from possible seismic disturbances or other forces, the above ground pipeline is built in a zigzag configuration that converts expansion into a sideways movement. The section of above ground pipeline shown here is just south of Prudhoe Bay., 1976-05, PCA0002-1b-48, Folder: PCA0002-1b. Alyeska Pipeline Service Company : Trans-Alaska Pipeline Construction Collection, 1976-1977, PCA 2. Alaska State Library - Historical Collections Finding Aids. https://alaska.libraryhost.com/repositories/2/archival_objects/17386 Accessed May 23, 2025.