Abstract:
A pipe initiation anchor forming a fixed anchor point for use in laying underwater pipelines comprises a ground engaging member in the form of a ballast box or a ground pile, a socket for receiving an end portion of a pipeline, and a locking member for retaining the end portion of the pipeline within the socket. The locking member is pivotally mounted on the anchor and is biased towards a locking position by a counterbalance weight.
Abstract:
An underwater pipe anchoring device is adapted to be connected to an anchor for anchoring the pipe to underwater strata. A first support section is shaped to engage a first portion of the outer surface of the pipe and a second support section is shaped to engage a second portion of the outer surface of the pipe. A hinge connects an end of the second support section to the first support section so that the second support section can swing into and out of a position where the support sections surround the pipe and engage opposite sides of the outer surface of the pipe. The end of the second support section opposite the hinge is releasably connected to the first support section so that the support sections can be connected for supporting the pipe. Metal-to-metal contact between the support sections and pipe is prevented for protecting the pipe.
Abstract:
The invention relates to an anchoring device and method for anchoring a pipeline to the ground, in particular to the bottom of a body of water, such as the seabed.
Abstract:
The arrangement is designed for anchoring underwater and underground pipelines laid in wet and flood lands with swelling ground and permafrost areas and also where pipelines with varying temperature and pressure have to be made fast in the ground. The arrangement comprises anchors secured in the ground. A fastening element attached to the pipeline is connected to the anchors through resilient connecting means capable of changing their length under load. When ground swelling occurs, the forces set up by transverse displacement of the pipeline are taken by the resilient connecting means. The resilient connecting means can also be used for placing preload on the pipeline in order to increase its adhesion to the ground.
Abstract:
A resting device (1) of at least one portion of a linear structure (2) is for crossing an uneven underwater topography. The resting device (1) is suitable for supporting at least one portion of the linear structure (2) that defines a longitudinal direction (X-X) coincident with or parallel to the longitudinal development direction of the linear structure (2). The resting device (1) includes at least one buoyant element (3) and at least one tether (4), suitable for constraining the resting device (1) to a bed (5). The at least one buoyant element (3) is suitable for providing a sufficient buoyancy to keep the at least one tether (4) under tension. A deck (6) has a shape and material that allows distributed resting of at least one portion of the linear structure (2) on the resting device (1).
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.