A method for laying a pipeline on the bed of a body of water comprises assembling a pipeline on a laying vessel; launching the pipeline from the laying vessel; identifying a zone of the bed of the body of water that causes stresses greater than a threshold value determined for the pipeline; progressively laying the pipeline on the bed of the body of water by advancing the laying vessel; and making, through controlled plastic deformation, at least one curved section along the pipeline with a curvature concordant with the curvature assumed by the pipeline in proximity to said zone, when the pipeline is at least partly laid on the bed of the body of water and partly suspended with respect to the bed of the body of water in proximity to said zone.

A bending restrictor assembly has a pipeline section, a first overlying pipe section having a wall overlying a portion of the pipeline section at one end thereof, a second overlying pipe section having a wall overlying another portion of the pipeline section at an opposite end thereof, and a plurality of cylindrical members overlying the pipeline section between the first and second overlying pipe sections. The first and second overlying pipe sections extend outwardly beyond the respective ends of the pipeline section. The bending restrictor assembly achieves a permanent bend and restricts ovality of a subsea pipe.

A protective member at least partially surrounds a desired length of pipe (such as a conventional landing string) and protects “umbilical” control line(s) or bundles, including pipe and umbilical line(s) installed within risers of subsea installations. At least one robust protective shell member is installed around at least a portion of a pipe string and forms at least one elongated channel. At least one umbilical control line is disposed within the elongated channel and is shielded against damage from inadvertent or unwanted abrasion, impact or other forces.

A sliding subsea foundation comprises a polymeric shoe layer on the underside of a mudmat or subsea structure. The shoe layer defines a soil-engaging face that comprises an array of parallel grooves. The grooves are shallower than the thickness of the shoe layer such that each groove has a closed top, defined by and integral with the shoe layer, that spans the groove. Where a subsea structure is supported on the foundation with a subsea pipeline attached to the structure, the grooves are substantially parallel to a longitudinal axis of the pipeline.

Method for vibration damping of and vibration damper assembly for semi-submerged or submerged structure, based on separating hydrodynamic added mass from the semi-submerged or submerged structure by means of a vibration damper assembly exhibiting spring and/or damper properties and use the hydrodynamic added mass as a reaction mass in the vibration damper assembly.

A cladding (10) for an elongate member to be deployed underwater includes multiple cladding sections (12, 26) each being configured to receive the elongate member and each having proximal and distal ends configured to engage with longitudinally neighbouring cladding sections (12, 26) enabling a continuous length of the cladding to be constructed from multiple cladding sections. At least one of the cladding sections is provided with a sensor module dock (28) configured to receive and releasably mount a sensor module (30) to the cladding.

The present invention proposes a device capable of allowing remote unlocking operation and remaining compatible with the possibility of a mechanical and manual drive. The device is a hydraulic actuator (2) with hydraulic power supply through the lines coming from the platform. It also has a handle (4) for manual driving.

The invention allows cost reduction with PLSVs (waiting for diving and standby weather) and with diving activities themselves, in addition to greater agility in pull-out operations. Further, it promotes the diminishment of the need for diving and, consequently, lower MHRE (Man-Hour of risk exposure).

A vibration attenuation device is provided. The vibration attenuation device includes one or more connectors configured to be attached to a primary structure, a plurality of beams mounted on the one or more connectors, and a plurality of weight materials attached to the beams. The primary structure comprises at least one of a pipe, a rod or a shaft.

A protection device for preventing damage to an elongate flexible member passing through an aperture including a body portion adapted to be inserted into the aperture in a first direction and having an internal passageway for allowing movement of an elongate flexible member therethrough, and at least one latching element pivotally mounted on the body portion. The protection device can be used for protecting an elongate flexible member passing through an aperture in a support pillar of an offshore turbine generator. A method of removing the protection device from an aperture is also disclosed.

A connection assembly for engaging a tubular member underwater to restrain the tubular member from radial movement relative to the connection assembly includes a plurality of pads for engaging the tubular member at circumferentially spaced positions; and a plurality of biasing arrangements, each for biasing a respective pad radially inwardly into engagement with the tubular member; wherein each biasing arrangement includes a pre-loadable, mechanical, compressed spring arrangement for resiliently pressing its respective pad against the tubular member. The assembly need not employ any hydraulic components.