Daewoo Shipbuilding and Marine Engineering (DSME) was awarded the contract to build four drillships capable of drilling up to 30,000 feet in 10,000 feet water depth and scheduled for delivery by mid September 2008. The structural design of the drillships was based on the operating experience of the owner Transocean Offshore Deepwater Drilling Inc, and takes into account the new requirements of DnV OS Rules and CSA2 guidelines. The former are based on Load and Resistance Factor (LRFD) format, which is different from the other conventional approach, Working Stress Design (WSD). Whole ship analysis was performed. The overall structural design procedures for the drillships are presented and recommendations are proposed in the paper. Other features of the structural design process including the fatigue assessment and accidental load assessments are presented.
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