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Figure 6.8 - Relative hull responses of the three designs
During the concept selection phase, efforts are concentrated on the main
dimensions and weights under the consideration of design standards and
performance requirements without a high degree of engineering detail. Finalized
dimensions and main properties of the floating structures will be determined in the
front-end engineering and design (FEED) stage through various analyses.
Floating drilling vessels are classified in two basic categories: (1) ship
shape, e.g., drillships with hulls similar to ships and barges that are self- propelled
or towed to location and (2) semisubmersibles (semis) (fig. 6.9).
6.2.1 Semi-submersible platforms
Concerning the group of the mobile offshore structures, the semi-
submersibles can be considered as typical offshore units .
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