The COASTAL DRILLER is elevated in 192 feet of water. Leg penetration is 83 feet. The maximum leg reaction is 5,940 kips. The waves are 30 feet and the current is 2 knots. What is the maximum wind for drilling?
• Jack-up rig environmental limits for simultaneous wind, wave, and current • How maximum leg reaction relates to allowable environmental loading • Effect of water depth and leg penetration on operational wind limits
• Given the leg reaction is already at its maximum, how do increasing wind speeds affect the total load on the legs when waves and current are fixed? • Which of the listed wind speeds is most consistent with a drilling (operating) condition versus a survival or storm condition for a jack-up rig? • How do relatively large waves (30 ft) and a 2-knot current influence the remaining "capacity" for wind loading before exceeding maximum leg reaction?
• Confirm that maximum leg reaction means you cannot exceed this value when combining wind, wave, and current loads • Think about typical operational wind limits for drilling on a jack-up when waves are already at 30 ft • Eliminate any choices that look more like survival/storm limits rather than normal drilling limits under these sea conditions
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