Another activity that took place during the period was the testing of heat pipes. Almost 120,000 radiator-topped thermal devices, called heat pipes, are installed in vertical support members for much of the above ground portion of the pipeline. The heat pipes dissipate heat from the ground to insure pipeline support structures have a solid, permanently frozen base., 1977-04, PCA0002-4b-24, Folder: PCA0002-4b. 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/17816 Accessed February 22, 2025.