A device for damping hydrosound in liquid having a frequency range emitted from a sound-emitting body in the liquid includes: a plurality of individual gas volumes distributed in the liquid in an area of the sound-emitting body and at a distance from each other, each of the individual gas volumes being operable to reduce the hydrosound through resonant oscillations; and at least one mass body disposed in the liquid, the individual gas volumes being connected to the at least one mass body so as to prevent the individual gas volumes from rising up in the liquid.

A transportable, flexible rope net gabion useful for scour protection includes a lifting ring, a plurality of polymer ropes connected to the lifting ring, a polymer net connected to the polymer ropes, and a plurality of stones or boulders. Up to 45% of the volume of the polymer net is packed with the stones or boulders, so that the rope net gabion can be evenly positioned around a structure to be supported. The polymer ropes, the polymer net, or both the polymer ropes and the polymer net are made using virgin high density polyethylene (HDPE).

An epoxy grout composition for marine repairs contains: a liquid epoxy resin comprising up to 15 wt. % benzyl alcohol and having a viscosity of 220 to 1100 cps; a liquid hardener comprising up to 25% benzyl alcohol and having a viscosity of 50 to 85 cps and, wherein the total benzyl alcohol content of the combined resin and hardener ranges from 1 to 12 wt. %; and preferably, a particulate inorganic filler comprising 10 to 50 wt. % of particles under 150 μm and 50 to 90 wt. % of particles between 150 μm and 1.18 mm. The composition is particularly suitable for placement in the annular space between a marine structure and a fiberglass composite jacket. The composition may be provided in kit form, with premeasured containers of resin, hardener, and filler. A related method is also disclosed.

A flow modification device connectable to a generally cylindrical element adapted for immersion in a fluid medium is provided. The device comprises an elongate body having a length and a generally circular cross-section; a plurality of raised body portions disposed about and extending along the length of the elongate body, the raised body portions having a height between 2% and 10% of a diameter of the body; and an aperture extending through the length of the elongate body, the aperture being adapted to receive the generally cylindrical element such that the flow modification device is arranged about the cylindrical element. The plurality of raised body portions are helically arranged or twisted about a longitudinal axis of the elongate body and are adapted to reduce vortex-induced vibration and/or drag on the cylindrical element when the device is connected to the cylindrical element and the connected device and cylindrical element are immersed in the fluid medium and there is relative movement between the connected device and cylindrical element and the fluid medium.

The invention provides an object (10), that during use is at least partly submerged in water, wherein the object (100) is selected from the group consisting of a vessel (1) and an infrastructural object (15), the object (10) further comprising an anti-biofouling system (200) comprising an UV emitting element (210), wherein the UV emitting element (210) is configured to irradiate with UV radiation (221) during an irradiation stage one or more of (i) a first part (111) of an external surface (11) of said object (10) and (ii) water adjacent to said first part (111) of said external surface (11) of said object (10), wherein the object (10) further comprises protruding elements (100) with the UV emitting element (210) configured between the protruding elements (100) and configured depressed relative to the protruding elements (100).

The invention relates to an offshore installation, comprising an underwater foundation structure, a construction placed onto the foundation structure, a docking device for a boat, and a device for cathodic corrosion protection for the underwater foundation structure, said device having at least two anodes (2), which are arranged at a distance from each other and are each fastened to a beam (4) or a support of the foundation structure, the extension arms or the supports being connected directly to the foundation structure below the waterline.

Disclosed herein is an eco-friendly, flexible rope net gabion (5) for facilitating scour protection. Said flexible rope net gabion is packed to the extent of 45% with rocks or boulders. The packing to the extent of 45% allows the flexible rope net gabion to be evenly position around the structure (100) to provide uniform anchorage.

A protective jacket encircles a pile that is covered with a protective tape so that the tape cannot unravel, which is a common problem with these wraps. The protective jacket has a number of components that are bolted together to squeeze the pile. The protective jacket has an expanded metal mesh on the inner surface of the jacket, to engage and press against the protective tape wrap to prevent the protective jacket from slipping down the pile due to gravity. Embodiments for cylindrical piles and for H-piles are disclosed.

An apparatus and method for prevention and treatment of marine biofouling on a surface to be treated by the apparatus includes a body defining a cavity, the body terminating in a distal open end that is adapted, in use, to be in the vicinity of a surface to be treated such that the surface forms a first end wall of a chamber within the cavity; an acoustic transducer mounted within the cavity to form an opposite second end wall of the chamber, the acoustic transducer being adapted to cause acoustic pressure fluctuations; and a reservoir for a liquid, the reservoir including an inlet passage and a plurality of mutually spaced outlet passages for liquid flow from the reservoir into the chamber, the outlet passages at least partially surrounding the chamber in the vicinity of the distal open end.

A system (200) comprising a light source (220) configured to generate light source radiation (221), wherein the light source radiation (221) at least comprises UV radiation, wherein the system (200) further comprises a luminescent material (400) configured to convert part of the light source radiation (221) into luminescent material radiation (401), wherein the luminescent material radiation (401) comprises one or more of visible light and infrared radiation, wherein the system (200) is configured to generate system light (201) comprising the light source radiation (221) and the luminescent material radiation (401).