Systems for assembling a wind turbine without the assistance of cranes. According to some implementations a system is provided that includes lifting systems having lifting platforms arranged peripherally around the tower. The lifting platforms cooperate with different connection tools that can be supported on an auxiliary column and thus lift or lower the tower modules.

A hoisting system for the installation of a wind turbine wherein said hoisting system comprises measures to achieve a load bearing connection to the tower of the wind turbine and comprises measures to move the hoisting system up and down along the tower wherein the hoisting system, when it is fixed to an already installed part of the wind turbine tower with said load bearing connection, is arranged to install or remove any of a tower segment, a nacelle, a generator, a hub, and a blade in one or more combined hoists or in a single hoist.

A wax control element for subsea processing of well fluids in a wellstream comprises a bundle of flowlines within an elongate tensile structure. That structure defines inlet and outlet ends and has cooling and heating provisions that act on the flowlines, in use, to promote deposition of wax in the flowlines and subsequent entrainment of wax in the wellstream.

A support device configured to be positioned on a lifting vessel in order to support a topside of an offshore platform, the support device comprising: a main cylindrical casing having an upper opening, the main casing defining a main vertical axis, the main casing further defining an upper support rim, a reservoir located inside the main casing for holding a granular material or a fluid, the reservoir having a discharge opening for emptying the reservoir, a spring support slideably arranged within the main casing, the spring support resting on the granular material or the fluid and being movable from an upper position to a lower position in dependence on a filing degree of the reservoir, a spring device positioned on the spring support, a receptor support positioned on the spring device, the receptor support defining an upper surface, and a receptor device.

A large-size floating structure which meets the needs for extending the activities of coastal towns is provided. The architectural and technical design can accommodate several thousand inhabitants, while attracting many visitors and customers to live, work and enjoy varied leisure facilities. This energy-autonomous marine district, which is non-polluting and environmentally friendly, constitutes an example of sustainable development. Each component of the structure of the barge provides a maximum of functions: structural, functional, ecological and architectural. By concentrating all of the activities of a town in a single complex, it is easier and more economical to resolve all the problems of sustainable development and safety than in the habitant next to the coast.

The invention relates to a pile upending system for upending a pile such as a monopile for the foundation of offshore wind turbines, the pile upending system comprising; a pivotally mounted pile support frame having a seat for engaging an outside wall of a pile, the pile support frame being pivotable around a support frame axis of rotation for allowing the seat to support the pile during upending, a cable system for supporting an, in use outboard, end of a pile, comprising one or more tensioned or tensionable cables having an outboard end provided with a hoisting member for supporting the outboard end of the pile during upending of said pile, an outboard support system comprising a frame member for, in use, extending outboard and supporting the hoisting member of the cable system,
wherein the outboard support system is arranged with respect to the pile support frame such that the frame member extends transverse with respect to the support frame axis of rotation for arranging the hoisting member at a distance from the seat and aligned with the seat such that a pile may engage the hoisting member upon longitudinal movement of the pile along the seat.

A method for installing a water-submersible platform is disclosed. The method includes lowering the platform in water from a vessel positioned above the platform while spuds connecting the vessel to the platform stabilize the platform during lowering. An assembly of the vessel and platform, and a vessel that is used to connect to the platform is also disclosed.

A subsea vessel includes filler material, which may be enclosed by an outer shell and may provide the vessel with a density for floatation. Exemplary applications for the vessels include buoyancy and tanks to hold fluids for operations subsea. The filler may include thermoplastic materials and/or concrete, which may be formed to create internal void spaces.

Process for installing an offshore tower, specifically a substructure, which basically comprises the following steps: a) dry manufacturing a foundation comprising a block (1, 1) basically made of concrete and dry manufacturing a base section (25) of a shaft (2); b) applying said base section to said foundation block, forming a unit called the starting unit; c) moving said starting unit to the installation point of said substructure; and d) actuating in a controlled manner, first ballast valve means in such a manner that said starting unit sinks until resting on the seabed; having placed said foundation block or said starting unit in the body of water where the installation point said substructure is located.

A vessel comprises a hull and a guide for guiding a monopile. The guide is movably mounted to the hull and includes a receiving part and a closure part which is movable for creating a closed condition of the guide where the guide forms an annular body extending in a main plane and an open condition in which the guide has an opening to a space, allowing a monopile to be received in the space. A displacing device displaces the guide within the main plane. A control system controls the displacing device and such that it determines an oscillating path of a monopile relative to the hull in a direction within the main plane when the monopile and the guide are moving towards each other and the guide is in the open condition for receiving the monopile. The displacing device displaces the guide substantially synchronously with the determined oscillating path.