The present embodiments relate to launch and recovery systems for a remotely operated vehicle. The embodiments eliminate or minimize the need for load lines, and provide virtually unlimited excursion distances for remotely operated vehicles, limited only by the amount of tether available at the launch point. Further, the embodiments allow for extended deployments of ROVs by allowing recharging of a tether climbing component while submerged. The system can include a launch and recovery assembly, a tether climbing component, and a remotely operated vehicle attached to a remotely operated vehicle tether. The launch and recovery assembly deploys the remotely operated vehicle and the tether climbing component overboard, and the remotely operated vehicle is configured for tethered operation while maintaining the tether climbing component at a desired depth.

Method and device (1) for lifting loads (7). An arm (2) that is the load or that supports a load (7) is pivotably connected to a reference. The load results in a torque. At least a part of the counter-torque to result in a system supporting the load is provided by a gas or hydro-pneumatic spring (60).

Method and device (1) for lifting loads (7). An arm (2) that is the load or that supports a load (7) is pivotably connected to a reference. The load results in a torque. At least a part of the counter-torque to result in a system supporting the load is provided by a gas or hydro-pneumatic spring (60).

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.

The method of providing depth compensated motion compensation proximate a subsea landing package to isolate heaving motion of the supporting vessel from the supported subsea landing package, comprising a supporting cylinder for connecting to the subsea landing package having a first cross sectional area exposed to environmental pressure with a resulting first force, a second and opposing cross section area exposed to environmental pressure providing a second and opposing balancing force, a piston within the cylinder with compressed gas in a first chamber on a first side of the piston and a low pressure gas or a vacuum is in a second chamber on the opposite side of the piston, and adjusting the gas pressure in the first chamber acting on the piston such that the force acting on the piston is approximately the in water buoyed weight of the subsea landing package.

The present invention relates to a motion compensation system for a load hanging from a mobile unit (1). The compensation system comprises two blocks (3 and 4), an articulated arm (2), a cable (5), at least one main cylinder (6) and at least one secondary cylinder (7). The secondary cylinder (7) is mounted to pivot (rotation about a substantially horizontal axis) on mobile unit (1) and on a joint of articulated arm (2).

The present invention relates to a motion compensation system for a load hanging from a mobile unit (1). The compensation system comprises two blocks (3 and 4), an articulated arm (2), a cable (5), at least one main cylinder (6) and at least one secondary cylinder (7). The secondary cylinder (7) is mounted to pivot (rotation about a substantially horizontal axis) on mobile unit (1) and on a joint of articulated arm (2).

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 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.

The present invention relates to a motion compensation system for an element hanging from a mobile unit, the system comprising two blocks, at least two articulated arms, a compensation cylinder and a cable. According to the invention, at least one characteristic length of the articulated system (for example: the length of a link or the distance between two sheaves of two articulated arms) is adjusted according to the motion to be compensated for.