Abstract:
A method of laying an undersea line at the bottom of the sea from the surface to connect the bottom end thereof to a coupling element at the sea bottom by positioning the undersea line suspended from the surface in a substantially vertical position and including a curving device extending between two points and having at least one cable and tensioning means for tensioning the cable suitable for reducing the length of the cable extending between the two fastening or guide points from a maximum length L0 to a given shorter limit value L1; moving the bottom end of the undersea line in such a manner as to move the bottom end of the undersea line away from its initial position through a distance D, if necessary, moving the undersea line closer to the sea bottom while simultaneously lowering the line additionally from the surface, and then finalizing the positioning and connecting of the bottom end of the line to the sea bottom.
Abstract:
A method of supporting an intake pipe for deep seawater, the intake pipe being made of resin having a smaller specific gravity than the deep seawater, the method including: mooring at least a neighborhood part of an intake port of the intake pipe with a plurality of mooring devices (e.g., pendant-type anchors) each including a mooring wire (e.g., wire rope) and a heavy weight (e.g., concrete block); and mooring the neighborhood part of the intake port in the form of an arc directed to the sea surface.
Abstract:
A method of anchoring a pipeline at a subsea location includes the steps of installing a first pile into the subsea location in a position away from the pipeline, affixing a first line to the pipeline and to the first pile, and tensioning the first line from the pipeline. A second pile is installed into the subsea location in a position away from the pipeline and away from the first pile. A second line is affixed to the pipeline and the second pile. The second line is tensioned from the pile. Each of the first and second lines extends on opposite sides of the pipeline at an acute angle relative to a longitudinal axis of the pipeline. Each of the pile is a suction pile having a tensioning mechanism thereon.
Abstract:
A method of securing a pipeline to the bed of a body of water includes moving an underwater vehicle selectively, on the bed of the body of water, along the pipeline; transporting a plurality of fastening devices on the underwater vehicle; and driving each fastening device partly into the bed of the body of water, close to the pipeline, by a handling device mounted on the underwater vehicle, to confine the pipeline between the bed of the body of water and the fastening device.
Abstract:
A method of laying an undersea line at the bottom of the sea from the surface to connect the bottom end thereof to a coupling element at the sea bottom by positioning the undersea line suspended from the surface in a substantially vertical position and including a curving device extending between two points and having at least one cable and tensioning means for tensioning the cable suitable for reducing the length of the cable extending between the two fastening or guide points from a maximum length L0 to a given shorter limit value L1; moving the bottom end of the undersea line in such a manner as to move the bottom end of the undersea line away from its initial position through a distance D, if necessary, moving the undersea line closer to the sea bottom while simultaneously lowering the line additionally from the surface, and then finalizing the positioning and connecting of the bottom end of the line to the sea bottom.
Abstract:
A pipeline buoyancy control assembly is operable to simultaneously retain a plurality of pipelines against buoyancy forces. Respective ends of two retaining straps corresponding to two respective pipelines engage a tie-down member of a single control assembly. The retaining straps are placed over the respective pipelines and other ends of the retaining straps are attached to additional control assemblies. Further, stresses exerted on the retaining straps when the pipelines are subjected buoyancy forces are minimized by the unique structure of the tie-down member and the manner by which the retaining straps attached thereto.
Abstract:
For regulating the lateral buckling of a section of pipe, at least one device permanently applies a force to a point on the section of pipe. The force is preferably applied substantially horizontally and perpendicular to the axis of the pipe. Preferably, two of the devices that apply equal and opposing forces are positioned at a distance from each other along the section of a pipe. Each device comprises a clamp, a cable, a return device and a buoy or a weight.
Abstract:
A method and apparatus for installing bottom anchors for anchoring a pipeline on or under a water bottom. Such apparatus includes means for attaching the anchor driving mechanism to the pipe for exerting a downward force on the anchor drive mechanism while the anchors are being driven into the bottom. The present invention also includes means on the anchors for cutting through hard surface formations such as coral or the like.
Abstract:
The clamping device (18) comprises at least four clamping components (30A to 30C) and connecting elements (32) comprising, for each clamping component (30A to 30C) at least one elastic tightening member (76) connecting a supporting member (40) of the clamping component (30A to 30C) with a supporting member (40) of a first adjacent clamping component (30A to 30C) and at least one elastic tightening member (78) connecting the supporting member (40) with a supporting member (40) of a second adjacent clamping component (30A to 30C). Each elastic tightening member (76, 78) comprises an elongated part and two end stops, each end stop cooperating respectively with a supporting surface (40), each elastic tightening member (76, 78) being longer than the transverse extent of a central lumen defined by the clamping components (30A to 30C), and protruding beyond the supporting members (40) connected by the elastic tightening member (76, 78).
Abstract:
Système (11) pour retenir latéralement un conduit ombilical (6) notamment utilisé pour un forage pétrolier en eau profonde, caractérisé en ce qu'il comprend : - un anneau rotatif (16) prévu pour être fixé sur un élément dudit conduit ombilical (6); et, - au moins un dispositif de mouillage, de préférence trois, chaque dispositif étant prévu pour être fixé audit anneau rotatif, de façon à exercer une tension latérale sur ledit conduit (6); chaque dispositif de mouillage comprenant de préférence un câble (31) prévu pour être fixé audit anneau rotatif (16).