A compensating device (200) maintains specifiable target positions of a load (206) handled using a cable hoist (202) and attached to a cable (216) of the cable hoist. The respective specifiable target position of the load may change unintentionally to an actual position deviating from the target position. The compensating device has a sensor device (240, 242) for detecting the respective actual position of the load (206). A rotational drive (226, 228, 230) specifies a cable length of the cable hoist (202). A controller (244) changes the cable length after the respective actual position has been detected until the load (206) re-assumes its target position. The respective drive (226, 228,230) can be controlled at least partly by a hydraulic motor (226, 228, 230) with opposite rotational directions. The motor is connected to an actuating device (246) having at least two separate pressure chambers (250, 252) with pressure levels that differ during operation, thereby forming a drive section (248) for the respective hydraulic motor (226, 228, 230), and which can be actuated by the controller (244).

A deepwater hoisting system includes a synthetic fibre rope winch assembly including a motor driven first winch and a length of synthetic fibre rope driven by said first winch. The synthetic fibre rope has an end remote from the first winch. The system further includes a steel wire winch assembly including a motor driven second winch and a length of steel wire driven by said second winch. The steel wire has an end remote from the second winch. At least the second winch is an active heave compensation motor driven winch. The system further includes a lifting block having a lifting block sheave, through which the synthetic fibre rope is run. The end of the synthetic fibre rope is connected to the end of the steel wire, so that the lifting block is suspended in a double-fall arrangement.

There is disclosed a retrieval system for retrieving a vessel from water to a deck of a recovery vessel, comprising: a lifting device mounted on the deck of the recovery vessel, the device comprising a substantially vertically extending structure and a lifting hook mounted to said substantially vertically extending structure so as to be raised and lowered therefrom by way of a first winch; a connection lead having a free end configured to detachably connect to a connection link of the vessel to be retrieved from the water an opposing end of the connection lead being located on the recovery vessel; a capture member mounted with respect to the lifting hook to capture the connection link of the vessel when the free end of the connection lead is raised towards the lifting hook; and a control member mounted with respect to the lifting hook of the lifting device and configured to receive at least a portion of the connection lead so as to direct the connection link to the capture member to be captured thereby as the free end of the connection lead is raised towards the lifting hook; wherein upon capture of the connection link by the capture member the winch is operated to facilitate lifting of the vessel from the water to the deck of the recovery vessel.

A vehicle includes an auxiliary battery configured to power an electrical. accessory, a traction battery configured to provide power to propel the vehicle, a winch including a motor and cable, and a controller configured to, responsive to a requested torque of the motor being less than a threshold, initiate transfer of power to the motor from the auxiliary battery, and initiate transfer of power to the motor from the traction battery otherwise.

A compact and simplified heave compensation system for reducing the effect of waves or wavelike movements on a lifting device. The system can have active and passive heave compensation components. An overload protection to protect lifting equipment can also be implemented. The system enables accurate load and displacement calculations, as well as simplifying the control schemes utilized for lifting devices.

A deepwater hoisting system includes a synthetic fibre rope winch assembly including a motor driven first winch and a length of synthetic fibre rope driven by said first winch. The synthetic fibre rope has an end remote from the first winch. The system further includes a steel wire winch assembly including a motor driven second winch and a length of steel wire driven by said second winch. The steel wire has an end remote from the second winch. At least the second winch is an active heave compensation motor driven winch. The system further includes a lifting block having a lifting block sheave, through which the synthetic fibre rope is run. The end of the synthetic fibre rope is connected to the end of the steel wire, so that the lifting block is suspended in a double-fall arrangement.

In a heave motion compensation system and method for adjusting heave motion compensation, for use with an offshore hoisting device, the heave compensation is provided by, firstly, a cylinder having a piston, which is to be connected to a gas buffer for providing the hoisting device with passive HC, and secondly a sheave head, including one or more sheaves for engaging a hoisting wire of the hoisting device, wherein the sheave head is supported by the piston for movement along a HC-trajectory, and thirdly a sheave head track, extending parallel to the HC-trajectory. The adjusting of the passive HC is realized by adjusting movement of the piston of the heave compensation cylinder using an adjusting winch connected to the piston of the cylinder via a trolley supported by a trolley track, which track is located adjacent the HC-trajectory.

A coupling device for recovering an unmanned ship includes: a coupling unit, which is lifted and lowered by being connected to a crane provided in a mother ship; an accommodation unit provided in the unmanned ship, and having a vertically communicating coupling hole; a guide unit performing guiding such that the coupling unit is coupled to the accommodation unit, and including a towing line formed to be long, and a winch connected to the other side of the towing line so as to selectively wind or unwind the towing line; and a control unit including a sensing part for sensing the tension applied to the towing line by the driving of the winch, and a control part for lowering the coupling unit connected to the crane, if the intensity of the tension sensed by the sensing part is a preset value or higher.

A drilling apparatus is provided. The drilling apparatus according to one aspect of the present invention comprises: first and second moving modules; first to third drawworks for vertically moving the first and second moving modules; a wire for successively connecting the first drawwork, the first moving module, the second drawwork, the second moving module and the third drawwork; a first fixing drum positioned between the first drawwork and the first moving module so as to support the wire; and a second fixing drum positioned between the second moving module and the third drawwork so as to support the wire.

A method for securing a lifting movement of a load mechanically coupled to a hook of a lifting device by flexible links, wherein the flexible links can be, when the load is placed on the ground, either in a stretched state or in a relaxed state. The method includes detecting an initiation of a transitional phase between an initial instant when the load is placed on the ground and a final instant when the load is suspended in the air; and emitting a detection signal of a proscribed lifting situation, if the flexible links are, at least at an instant of the transitional phase, in the relaxed state.