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relationships among the payload, the size of the hull, and the
mooring system.
Figure 2.1 - 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. 2.2).
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