Abstract: A method for pile installation wherein use is made of a vessel for pile installation. A pile holding system is mounted to the hull of a vessel, e.g. on deck (2) of a vessel, which pile holding system is configured to hold the pile in an upright orientation at a pile installation location at least whilst suspended from a crane by means of one or more winch driven cables, e.g. for installation of a pile adapted to support an offshore wind turbine, the pile holding system comprises a pile holding tool (40).

Abstract: A wave-induced motion compensating crane includes a hoist assembly. At least two departure sheaves are mounted at opposite lateral sides of the jib. The object suspension device is supported both by two hoist cables extending laterally from the jib and a third hoist cable that runs via another departure sheave. The hoist assembly is adapted to hoist and/or lower the object suspension device with an object connected thereto, between a lower position and a position at a height up to the departure sheaves while the hoist cables together define a reverse pyramid, diverging upwards in between the object suspension device and the departure sheaves.

Abstract: A wave-induced motion compensating crane includes a hoist assembly. At least two departure sheaves are mounted at opposite lateral sides of the jib. The object suspension device is supported both by two hoist cables extending laterally from the jib and a third hoist cable that runs via another departure sheave. The hoist assembly is adapted to hoist and/or lower the object suspension device with an object connected thereto, between a lower position and a position at a height up to the departure sheaves while the hoist cables together define a reverse pyramid, diverging upwards in between the object suspension device and the departure sheaves.

Abstract: A semi-submersible vessel for offshore operations is suitable to be operated in icy waters and in ice-free waters. The vessel includes an operating deck, at least one lower hull, an essentially vertical connecting structure between the at least one lower hull and the operating deck, and a ballast system. The connecting structure has a water portion and an icebreaking portion arranged on top of each other. The vessel is configured to have an icebreaking draft for icy waters, and a water draft for ice-free waters in which the waterline is substantially level with the water portion. The icebreaking portion has a closed tapered contour. During the water draft, the collective area of the water portion of the connecting structure intersecting the water surface is smaller than the collective area of the icebreaking portion of the connecting structure intersecting the water surface during the icebreaking draft.

Abstract: A tailpipe stone dumping vessel (1) for stone dumping through a fallpipe suspended from the vessel, comprising: • a hull (1a), • a fallpipe section storage for storing fallpipe sections (2), • a tower (20) at least comprising fallpipe support means (40) for supporting the suspended fallpipe, said tower (20) being adapted for assembly and disassembly of the fallpipe by addition of a fallpipe section to the upper end of the suspended fallpipe or removal of a fallpipe section from the suspended fallpipe, respectively, • a tower gimbal structure (22) provided between the hull and the tower providing a pivotal mode for the tower (20) wherein the tower is pivotable about at least one pivot axis with respect to the hull so that the tower—and the fallpipe suspended there from—has in a plane associated with said at least one pivot axis an orientation essentially independent from sea-state induced vessel motions, • hoist means (31, 32, 33, 34) for lowering and raising the suspended fallpipe, • fallpipe section handling

Abstract: A semi-submersible vessel for offshore operations is suitable to be operated in icy waters and in ice-free waters. The vessel includes an operating deck, at least one lower hull, an essentially vertical connecting structure between the at least one lower hull and the operating deck, and a ballast system. The connecting structure has a water portion and an icebreaking portion arranged on top of each other. The vessel is configured to have an icebreaking draft for icy waters, and a water draft for ice-free waters in which the waterline is substantially level with the water portion. The icebreaking portion has a closed tapered contour. During the water draft, the collective area of the water portion of the connecting structure intersecting the water surface is smaller than the collective area of the icebreaking portion of the connecting structure intersecting the water surface during the icebreaking draft.

Abstract: A tailpipe stone dumping vessel (1) for stone dumping through a fallpipe suspended from the vessel, comprising: • of a hull (1a), • a fallpipe section storage for storing fallpipe sections (2), • a tower (20) at least comprising fallpipe support means (40) for supporting the suspended fallpipe, said tower (20) being adapted for assembly and disassembly of the fallpipe by addition of a fallpipe section to the upper end of the suspended fallpipe or removal of a fallpipe section from the suspended fallpipe, respectively, • a tower gimbal structure (22) provided between the hull and the tower providing a pivotal mode for the tower (20) wherein the tower is pivotable about at least one pivot axis with respect to the hull so that the tower—and the fallpipe suspended there from—has in a plane associated with said at least one pivot axis an orientation essentially independent from sea-state induced vessel motions, • hoist means (31, 32, 33, 34) for lowering and raising the suspended fallpipe, • fallpipe section handl