Abstract: The invention relates to a centrifugal pump (1) comprising a pump housing (2) which is provided with an axial inlet (6), an outlet (5) and a rotor (7) which is attached in the pump housing (2) such that it can rotate about an axial rotation axis A. The rotor (7) is provided with a central boss (9), a shaft shield (11) fastened to the boss (9), a suction shield (12) attached so as to be axially set apart from the shaft shield (11), which suction shield (12) has an axial supply (14) aligned with the axial inlet (6) of the pump housing (2), and a plurality of rotor blades (15) which are fastened between the shields (11, 12). The radial inner ends (18) of the rotor blades (15) are connected to the suction shield (12) by a substantial perpendicular connection.

Abstract: A device for tensioning anchor chains, in particular mooring legs of off-shore vessels and installations, comprises a frame carrying connectors for holding together lower and upper portions of the chain to be tensioned. The frame further carries a tensioning mechanism for pulling at least one portion of the chain towards the other portion of the chain while the device is submerged.

Abstract: A device for launching subsurface mining vehicle into a water mass from a docking well of a floating vessel, and/or recovering said vehicle from the water mass is disclosed. The device comprises a docking frame that is hinge mounted to the vessel, and that comprises first mining vehicle engaging means for guiding the mining vehicle along a longitudinal direction of the frame into the water. The docking frame operatively engages with drive means for tilting the frame in a vertical plane between a substantially horizontal mining vehicle docking position and a substantially vertical mining vehicle launching or recovery position. The device further comprises third engaging means for guiding the mining vehicle when the vehicle extends at least partly underneath a base of the vessel. The device allows lowering or recovering subsurface mining vehicle in a controlled manner.

Abstract: A method for operating a cutting dredger in open water, in particular to control a ground reaction force during dredging operations, the dredger including; a floating body, an elongate cutter ladder having a cutting head at its lowerable free end for dredging, which cutter ladder is hingeably coupled to the floating body and hingeable between an upwards position and a cutting position wherein the cutting head engages matter to be cut away at the floor of a body of water.

Abstract: A flexible conduit for transporting abrasive slurry, includes a flexible tubular body, such as rubber tube, and a plurality of wear-resistant rings provided in the body along the length of the conduit for protecting the inner surface of the body against abrasive action of the slurry, wherein at least one ring of the plurality of rings includes an indentation for engaging the tubular body in a form closed manner, and wherein the indention is arranged with the ring such that radial movement of the ring with respect to the conduit is prevented.

Abstract: A device for and methods of reducing sound vibrations in a liquid resulting from a sound source arranged below the liquid level of a body of water are disclosed. The device includes an elongate tube which can be arranged over the sound source, the tube comprising an outer wall and inner wall with an intermediate space between the inner and outer wall.

Abstract: The invention relates to a spud system for a dredging vessel with a longitudinal direction, which spud system comprises; a spud carrier for mounting a spud therein in a vertical stance and which spud carrier is mounted for limited rotation around a horizontal transverse axis and is moveable with respect to the dredging vessel in a longitudinal direction for advancing the dredging vessel, and a spud carrier drive system coupled with the dredging vessel and the spud carrier for driving the spud carrier with respect to the dredging vessel.

Abstract: A pile upending device for large diameter tubular elements includes; an annular base ring for extending along substantially the entire circumference of the tubular element, a central lifting arm for coupling the pile upending device to a hoisting element, which lifting arm is hingeably coupled with the base ring, a number of wedge assemblies disposed along the outside circumference of the base ring for facing the inside surface of the tubular element and frictional engagement with the tubular element.

Abstract: A system to monitor and analyze a multi-strand rope includes a rope data sensor to collect data regarding the physical state of the rope; one or more usage sensors to collect data regarding the usage of the rope; a position measurement device to measure the position of the rope; and a computer system connected to the rope data sensor, the one or more usage sensors and the position measurement device to correlate the collected data and position measurement to give real-time data on the status of the rope at one or more sections.

Abstract: A valve includes an inlet to allow gas to enter the valve; an overpressure system to provide an overpressure; and a reclaim outlet to allow gas from the valve to exit the valve. Optionally, the reclaim outlet can connect to a reclaim system or a dump system which can be used for recovering the gas flowing through the valve.

Abstract: An assembly for being dragged by a vessel, wherein the assembly includes a filtering system and a fluidum guiding system, wherein the filtering system is suitable for filtering large volumes of fluidum, and wherein the fluidum guiding system defines a channel configured such that at least in a channel portion the current velocity of the fluidum guided through that channel portion is reduced downstream, and wherein the fluidum guiding system and the filtering system are mutually arranged such that current velocity of fluidum filtered in the filtering system is reduced for decreasing drag.

Abstract: A method of forming a cutter head with an axis of rotation comprises forming a hub; forming at least one ring with integral cutter body arm segments extending from the at least one ring; and connecting the hub to the cutter body arm segments so that the hub and the at least one ring are connected and around the axis of rotation.

Abstract: A pile driver system for installing or removing foundation elements, such as piles, anchors, and conductors, in a subsea ground formation, includes a closed housing defining a cavity, an impact weight accommodated inside the housing, a hydraulic circuit for reciprocating the impact weight, which circuit comprises one or more valves, a cylinder, and a piston accommodated in the cylinder and connected to the impact weight, a pump for withdrawing water from the surroundings of the pile driver and providing pressurized water to the hydraulic circuit, and at least one outlet for returning water to the surroundings. The exhaust of the hydraulic circuit communicates with the cavity and the outlet is located in the wall of the housing.

Abstract: A cutter head (1) for removing material from a water bed. The cutter head (1) is arranged to rotate about an axis of rotation (RA). The cutter head (1) includes a base ring (10) and a hub (20), the base ring (10) and the hub (20) being positioned rotational symmetric with respect to the axis of rotation (RA). The cutter head (1) includes a plurality of arms (30) extending between the base ring (10) and the hub (20), the arms (30) including a plurality of excavating tools (40). The excavating tools are provided by bits (40) having rotational symmetric bit ends (41), wherein the arms (30) include one or more groups of bits (40), each group including three or more adjacent bits (40) of which the bit ends (41) define a straight line segment (LS).

Abstract: A vessel (4) includes a crane (1) connected to a deck (5) of the vessel. The crane (1) includes a frame (10) which is rotatable about a horizontal hinge axis (H), a rotation mechanism (20) connected to the frame (10) at a position away from the horizontal hinge axis (H), arranged to rotate the frame (10) about the horizontal hinge axis (H) from an upper position to a lower position and vice versa, and a swivel member (30), which is with a first end (31) rotatable connected to the deck (5) and which is with a second end (32) rotatable connected to the rotation mechanism (20). The swivel member (30) is rotatable between an inward position associated with the upper position of the frame (10) to an outward position associated with the lower position of the frame (10).

Abstract: A drag head (100) for dredging material (2) from the bed (3) of a body of water and transporting the material (2) to a suction tube (120). The drag head (100) is arranged to be dragged over the bed (3) in a dragging direction (D). The drag head (100) includes a suction section (110) in which an under pressure can be created to suck up the material (2) from the bed (3) through a suction opening (113) into a suction chamber (112). A heel section (111) guides the drag head (100) along the bed (3). The suction section (110) is preferably rotatably connected to the heel section (111). The suction section (110) also includes an outlet (114) for transporting the material (2) towards the suction tube (120).

Abstract: A cutter head (1) for removing material from a water bed. The cutter head (1) is arranged to rotate about an axis of rotation (RA). The cutter head (1) includes a base ring (10) and a hub (20), the base ring (10) and the hub (20) being positioned rotational symmetric with respect to the axis of rotation (RA). The cutter head (1) includes a plurality of arms (30) extending between the base ring (10) and the hub (20), the arms (30) including a plurality of excavating tools (40). The excavating tools are provided by bits (40) having rotational symmetric bit ends (41), wherein the arms (30) include one or more groups of bits (40), each group including three or more adjacent bits (40) of which the bit ends (41) define a straight line segment (LS).

Abstract: A measuring system for controlling perpendicularity of a pile during driving of the pile includes a mounting frame for coupling the measuring system with a pile driving system, and a measuring frame provided with at least one measuring device for measuring perpendicularity of the pile. The measuring frame can be moveably coupled with the mounting frame.

Abstract: A vessel for installing a platform on an offshore support structure comprises a floating body, a lifting device which is tiltable about a tilting axis with respect to the floating body and a tilting force member for applying a tilting force to said lifting device. The lifting device is provided with a static part that is tiltable about the tilting axis and a movable part which is movable in vertical direction with respect to the static part. The tilting force member engages a drive location at the static part.

Abstract: A vessel (1) includes a spud (10), a spud lifting device (20) and a plurality of spud guiders (30). The spud guiders (30) are arranged to hold the spud (10) in a substantial vertical orientation and guide the spud (10) when moving in a substantial vertical direction between a lower position in which it can engage with a water bottom and an upper position. The spud lifting device (20) is arranged to lift the spud (10) from the lower position to the upper position. The vessel (1) further includes a spud position detector (40) to detect passage of the lower end (11) of the spud (10) along one or more spud detection points at predetermined heights.