Abstract: A crane includes a base structure; a slew bearing; a crane housing; a boom moveably mounted to the crane housing to be pivotable about a horizontal first pivot axis; three main hoisting systems; and a luffing system. The boom includes an A-frame with two boom legs that are connected at one end to the crane housing and at the opposite end to each other. Each main hoisting system includes a hoisting cable; a sheave block; a hoisting block; and a hoisting winch. The sheave block of each main hoisting system is pivotable about a horizontal second pivot axis that is perpendicular to the sheave rotation axis. The sheave blocks of the three main hoisting systems are arranged side-by-side. The luffing system includes two luffing winches; and two luffing cables extending between the respective two luffing winches. The luffing cables are connected to respective outriggers of the hammerhead structure.

Abstract: A crane including an inner boom, an outer boom, a plurality of guide assemblies arranged along the length of the inner and outer boom and adapted for guiding a plurality of lines, and a multi-line material handling system including a first line having an outgoing portion extending to a sheave block, and an incoming portion returning from the sheave block to a supported anchor device, and a second line having an outgoing portion extending to the sheave block, and an incoming portion returning from the sheave block to the supported anchor device.

Abstract: The invention relates to a marine load raising and lowering system for use on a vessel, comprising: i. a first winch comprising first driving means for raising or lowering a first cable from the first winch; ii. a second winch comprising second driving means for raising or lowering a second cable from the second winch; iii. operating means connected to the first and second driving means of respectively the first and second winch for synchronising the driving means so as to perform synchronous raising or lowering of the first and second cable; iv.

Abstract: A hook block sensor assembly is disclosed. In one embodiment, the hook block sensor comprises a housing configured to removably couple about a lifting hook of a lifting device, a first global navigation satellite system (GNSS) receiver coupled with the housing and configured for determining a hook block sensor assembly position in three dimensions, a load monitor coupled with the housing and configured for monitoring a load coupled with the lifting hook, including monitoring a load position and a load orientation of the load and a wireless transceiver coupled with the housing and configured for wirelessly providing information including the load position, the load orientation, and the hook block sensor assembly position, to a display unit located apart from the hook block sensor assembly.

Abstract: A method for determining heave and heave rate for a vessel is described. The vessel includes an inertial navigation system (INS), and sensors for the INS being located at a point A of the vessel, the vessel having a zero heave reference point B, and the described method provides heave and heave rate at a point C of the vessel. The method includes determining reference coordinates for points A, B, and C of the vessel, generating a velocity signal representative of a velocity at a point on the vessel, generating a heave rate signal based upon the velocity signal, and generating a heave based upon the heave rate signal.

Abstract: An apparatus for use on a vessel and for gaining access to a fixed structure such as a marine platform. As shown a supply vessel (1) has located on the deck (2) a mounting (3) which is connected by a gimbal arrangement (30) to a support arm (4) carrying a boom assembly (5) with a capsule (6) for personnel. The arm (4), boom (5) and capsule (6) are controlled in position by hydraulic means (9, 31, 33, 36, 40, 41, 52) to be manoeuvred into a required position to transfer personnel to the platform or decking (7) for example. In order to stabilise the position of the capsule (6) relative to the platform (7) the hydraulic means (9, 31, 33, 36, 40, 41, 52) is dynamically controlled to compensate for movement of the vessel (1) such that the capsule (6) will remain substantially in the selected spatial position relative to the platform (7). The capsule (6) may include a control system which enables an operator to statically position the capsule (6) through control of the overall systems.