Hydraulic engineering calculations of floating jack-up rig in various wave and wind load combinations
The paper presents hydraulic-engineering calculations of an offshore floating jack-up rig for various wave and wind load combinations in order to determine safety factors on shear, overturning, non-failure of pillar strings in case of a floating jack-up rig’s staying as well as for evaluation of the freeboard’s safety when removed from the drilling point. The calculations were performed for three locations of an offshore floating jack-up rig: with the head (stern), board and at the angle of 45° to the wind direction and wave run. The calculation envisages the worst combination of stability moment and overturning moment depending on the loading state of the floating jack-up rig, the magnitude and direction of extreme external effects.