Abstract: A mechanical coupling for immersed pipelines, of which one has a collar at its end.The device comprises a toothed counter-flange (3) placed against the collar (1a) of the tube to be repaired (1), a tubular body (2) welded by one end to the end of the tube to be assembled with the tube to be repaired (1) provided at its opposite end with an annular abutment (4) and on which tubular body (2) is placed by locking means (5), a mobile assembly comprising a spacer (6) forming the mobile jack body and an internal annular shoulder (6a) of which serves as a piston and defines at least one jack chamber, said spacer (6) cooperating at one of its ends with said locking means (5) and carrying at its other end a toothed flange (7) associated with resilient clamping maintenance means (8), as well as means for moving the locking means (5).

Abstract: A collar forming machine for the repair of submerged pipelines is provided comprising a forming module having the central shaft (10) passing through the body (12) of a main jack, a piston (18) sliding on the shaft and carrying at its end a forming punch (13), the shaft carrying in its part intended to penetrate inside the tube to be repaired internal locking means (14) to be forcefully applied to the inner face of the wall of the tube and capable of transferring the forming force to the tube itself, further comprising external locking means (17) applied to the external face of the wall of the tube to prevent deformation thereof.

Abstract: Seal comprising annular baseplate 5, carried on the surface of shaft 7, and main annular body 2, with annular metal reinforcement 3, comprising a continuous spring cast into the body, said annular body 2 being connected to baseplate 5 via flexible neck 4, and extended by lip 1, the exterior annular surface of which bears on the bore sidewall of tube 6, so that when an axial thrust, exerted by mobile actuator part 9, is applied to said annular body 2, the body is straightened, pivoting with respect to baseplate 5, and lip 1 bears on the sidewall of tube 6.Applications in the petroleum industry, in particular for the repair of pipes, and testing tubes at high pressures.

Abstract: Process and equipment for laying on the ocean floor a pipeline for the transfer of liquids or gas. In this process, the pipeline is constructed in a staging or shallow water area where the pipe is equipped with separate buoyancy and handling means, the conduit is submerged, towed to a location vertically above the pipeline route, the conduit is raised to the surface for inspection and preparation, one resumes in a controlled fashion and completes the submersion and positioning on the ocean floor, and finally the buoyancy and handling means are recovered. This process, due to its use of buoyancy and handling devices, considerably lowers the installation cost of underwater pipelines.