A measurement system that comprises at least one horizontal load measuring unit, that is preferably arranged on the leg guide is provided. The horizontal load measuring device measures or determines horizontal load on the position of the leg where the device is placed, which gives a more accurate indication of the leg bending moment than the rack phase differential measurement. Advantageously, multiple load measuring units can be provided along the leg guide.

A measurement system that comprises at least one horizontal load measuring unit, that is preferably arranged on the leg guide is provided. The horizontal load measuring device measures or determines horizontal load on the position of the leg where the device is placed, which gives a more accurate indication of the leg bending moment than the rack phase differential measurement. Advantageously, multiple load measuring units can be provided along the leg guide.

An offshore platform embarkation facility and an offshore platform, including a lift tower, wherein the lift tower is provided with a climbing device and the lift tower is provided with a transmission structure; a jacking frame, wherein a first moon pool allowing the lift tower to pass through is provided in the jacking frame; a lifting unit, wherein the lifting unit is installed on the jacking frame and the lifting unit is configured to cooperate with the transmission structure to raise and lower the lift tower; a lift platform, wherein a second moon pool allowing the lift tower to pass through is provided in the lift platform, and the lift platform is connected with the lift tower via the climbing device, and the lift platform is located below the jacking frame. When it is needed to load or unload personnel or goods, it is not required to lower the entire offshore platform to the height of the sea surface to enable a ship to be anchored, anchorage of ships and loading or unloading of personnel and goods can be quickly completed simply by means of the offshore platform embarkation facility, which saves energy consumption and time, improves the work efficiency and increases the service life of the offshore platform.

An offshore platform embarkation facility and an offshore platform, including a lift tower, wherein the lift tower is provided with a climbing device and the lift tower is provided with a transmission structure; a jacking frame, wherein a first moon pool allowing the lift tower to pass through is provided in the jacking frame; a lifting unit, wherein the lifting unit is installed on the jacking frame and the lifting unit is configured to cooperate with the transmission structure to raise and lower the lift tower; a lift platform, wherein a second moon pool allowing the lift tower to pass through is provided in the lift platform, and the lift platform is connected with the lift tower via the climbing device, and the lift platform is located below the jacking frame. When it is needed to load or unload personnel or goods, it is not required to lower the entire offshore platform to the height of the sea surface to enable a ship to be anchored, anchorage of ships and loading or unloading of personnel and goods can be quickly completed simply by means of the offshore platform embarkation facility, which saves energy consumption and time, improves the work efficiency and increases the service life of the offshore platform.

Various embodiments relate to a method and a harbour plant for mooring a floating body. The harbour plant includes a piled base structure provided with two upwards through sea level projecting sidewalls terminated above sea level and a laterally arranged bottom structure interconnecting the sidewalls, where a top surface of the bottom structure is arranged at a depth allowing the floating body to be floated in between the sidewalls, and where the floating body is arranged to be rigidly, but releasably supported by at least parts of the sidewalls. The method includes bringing the floating body into a position between the sidewalls and fixing rigidly the floating body to the vertical sidewalls of the base structure and still exposing the floating body more or less fully to buoyancy by allowing a water-filled gap at least between bottom of the floating body and a corresponding upper surface of the base structure.

Various embodiments relate to a method and a harbour plant for mooring a floating body. The harbour plant includes a piled base structure provided with two upwards through sea level projecting sidewalls terminated above sea level and a laterally arranged bottom structure interconnecting the sidewalls, where a top surface of the bottom structure is arranged at a depth allowing the floating body to be floated in between the sidewalls, and where the floating body is arranged to be rigidly, but releasably supported by at least parts of the sidewalls. The method includes bringing the floating body into a position between the sidewalls and fixing rigidly the floating body to the vertical sidewalls of the base structure and still exposing the floating body more or less fully to buoyancy by allowing a water-filled gap at least between bottom of the floating body and a corresponding upper surface of the base structure.

A jack-up platform is described having a horizontal working deck that may be jacked up out of the water by moving its legs to a position wherein they take support on an underwater bottom. The jack-up platform further comprises a mooring system for mooring a floating vessel at a mooring side of the jack-up platform. The mooring system comprises an elongated support means for supporting a hull part of the floating vessel, and guiding means connected to the hull of the jack-up platform at the mooring side. The guiding means are able to rigidly hold the elongated support means in a support position, in which the elongated support means is within reach of the hull part of the floating vessel to be supported when the hull is jacked out of the water and the jack-up platform rests on its legs. A method for mooring a floating vessel using the jack-up platform is also described.

The offshore jack-up has a hull and a plurality of moveable legs engageable with the seafloor. The offshore jack-up is arranged to move the legs with respect to the hull to position the hull out of the water. The method comprises securing the vessel with respect to the hull of the offshore jack-up when the hull is positioned out of the water and the legs engage the seafloor. A lifting mechanism mounted on the offshore jack-up engages with a cargo carrying platform positioned on the vessel. The platform is lifted with the lifting mechanism between a first position on the vessel and a second position clear of the vessel.

The offshore jack-up has a hull and a plurality of moveable legs engageable with the seafloor. The offshore jack-up is arranged to move the legs with respect to the hull to position the hull out of the water. The method comprises securing the vessel with respect to the hull of the offshore jack-up when the hull is positioned out of the water and the legs engage the seafloor. A lifting mechanism mounted on the offshore jack-up engages with a cargo carrying platform positioned on the vessel. The platform is lifted with the lifting mechanism between a first position on the vessel and a second position clear of the vessel.

A first permissible operating range of the self-elevating vessel is determined based on a first structural analysis of the self-elevating vessel under a first set of conditions. A structural utilization ratio of the self-elevating vessel is determined based on a second structural analysis of the self-elevating vessel under first and second sets of conditions. Safety of lowering the self-elevating vessel from an elevated state to a first hull draft level is determined when the structural utilization ratio is less than a predetermined value. Safety of lowering the self-elevating vessel from the first hull draft level to a second hull draft level is indicated when positional displacement data obtained while the vessel is at the first hull draft level indicates that the positional displacement of the self-elevating vessel while at the first hull draft level is within the first permissible operating range.