Method for determining a crane or cantilever operations envelope on a jack-up platform unit, jack-up platform unit
AssigneeGustoMSC B.V.
InventorsKayo Vanderheggen, Frederik Vanhee
Life of this patent
Estimating the term…
Abstract
A method is provided for determining an actual achieved pre-load value by monitoring a leg load characteristic during pre-loading. The method further comprises determining an actual crane or cantilever operations envelope taking into account the actual achieved preload instead. The method further comprises taking into account other data such as environmental loads or crane or cantilever movement.
Claims17
A method for determining a crane or cantilever operations envelope of a crane or cantilever mounted on a jack-up platform unit, the method comprising:
- applying a pre-load to at least one leg of the jack-up platform unit;
- monitoring at least one characteristic of said at least one leg to which the pre-load has been applied, during a predetermined time interval;
- monitoring the leg characteristic and/or a gradient of the leg characteristic during said time interval;
- evaluate whether the leg characteristic is stable during said time interval;
- repeating the above steps until during said time interval the leg characteristic is stable whereby the leg characteristic remains within the predetermined threshold and the gradient of the leg characteristic remains within the predetermined limit;
- wherein the value of the actual achieved pre-load is the leg load value associated with the thus achieved stable leg characteristic;
- determining an actual crane or cantilever operations envelope by calculating, per leg, the leg load capacity based on the actual achieved pre-load value and translating the calculated leg load capacity to a crane or cantilever operations capacity.
A system for determining an actual crane or cantilever operations envelope of a crane or cantilever on a jack-up platform unit comprising:
- a jack-up system arranged for moving an associated leg with respect to a hull of the jack-up platform unit and for applying a load on the leg;
- a control unit configured to monitor a characteristic value of the leg during a predetermined time interval of applying the load, to determine whether the characteristic value remains stable,
- wherein the control unit is further configured to determine the actual crane or cantilever operations envelope by calculating, per leg, a leg load capacity based on said load being associated with the characteristic having been determined to be stable during the predetermined time interval, and translating the leg load capacity to a crane or cantilever operations capacity.
Dependencies are inferred from the claim text.