🔍 Key Concepts

• Manufacturer/owner operating limitations for the COASTAL DRILLER hull operations • Effect of wave height on stability and control when lowering/refloating a mobile offshore unit • Difference between "can physically be done" and what is permitted in the procedures

💭 Think About

• Which of these wave heights would give the calmest, most controllable conditions for a delicate evolution like lowering and refloating the hull? • For a specific named unit like COASTAL DRILLER, are the limits usually conservative or near the edge of what the unit can tolerate? • If the sea state worsened slightly beyond the chosen limit, which of these values would still leave some safety margin rather than already being borderline?

✅ Before You Answer

• Check what the COASTAL DRILLER operating manual (or similar exam reference) specifies as the maximum significant wave height for lowering/refloating the hull. • Verify that you are picking the most conservative wave height that is still realistic for offshore operations, not the largest number that "sounds okay". • Confirm that the value you choose is consistent with the idea that this evolution should be done in favorable weather conditions, not just "tolerable" conditions.