FATIGUE-RESISTANT THREADED BEVELLED TUBULAR ELEMENT

摘要

The invention concerns a threaded tubular element (2) having a bevel such as a groove (30) produced in the material beneath the thread (4), to decrease the stiffness of the wall at the first engaged threads (22). The groove (30) enables to avoid additional tensile load at the first engaged threads (22) of the threaded element (2) whereon it is produced and the corresponding last engaged threads of the conjugated threaded element to which it is to be assembled to form a threaded tubular joint. The improved load transfer limits the risk of initial cracking due to fatigue on threaded tubular joints subjected to cyclic load without reducing their static performance.