API SPEC 5D pdf download Specification for Drill Pipe 3.1 carload: The quantity of pipe loaded on a rail car forshipment from the pipe-making facilities. 3.2 defect: An imperfection of sufbcient magnitude towarrant rejection of the product based on the stipulations ofthis specibcation. 3.3 elephant hide: The wrinkled outside diameter sur- faces of the pipe caused by the upsetting of...