Tubular with screw thread

A filament-reinforced tubular, wherein the tubular is on opposite ends provided with screw thread on an outside of the tubular, and with a torque-lock mounting area adjacent the screw thread, wherein the torque-lock mounting area is provided with grip enhancing surface features in the form of multiple parallel rib elements and/or parallel slots, for cooperating with rib elements and/or slots provided on an inside of a torque lock, for securing the torque lock against rotation about the longitudinal axis of the tubular, and wherein the pitch of the screw thread of the tubular increases in a direction away from the end of the tubular.

A coupling assembly for combining two filament-reinforced tubulars to form a riser section, wherein the coupling assembly comprises a coupling sleeve and two torque locks, and

• wherein the coupling sleeve comprises screw thread at opposite ends, for cooperating with the screw thread provided on the tubulars, and the pitch of the screw threads of the coupling sleeve increases in a direction towards the end of the coupling sleeve,
• wherein the two torque locks are provided with coupling teeth, the coupling teeth extending in an axial direction, and wherein the coupling sleeve is at opposite ends provided with coupling teeth, the coupling teeth of the coupling sleeve extending in the axial direction as well, and wherein the coupling teeth of the torque locks engage the coupling teeth of the coupling sleeve such that they block rotation of the torque locks relative to the coupling sleeve and allow for movement of the torque locks relative to the coupling sleeve in the axial direction.