The four-foot diameter pipe came from the mill with a 30-degree bevel on the ends. The bevels are cleaned by sandblasting all dust, dirt, oil or other material which could cause weld problems., 1976-07, PCA0002-2b-3, Folder: PCA0002-2b. 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/17502 Accessed February 22, 2025.