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2.1 Semi-submersible platforms
Concerning the group of the mobile offshore structures, the
semi-submersibles can be considered as typical offshore units .
Figure 2.2 - Semi-submersible platform
Semi-submersibles were introduced initiating from the idea
that their wave-induced motions are decreased by lowering a large
part of displacement (buoyancy) to a region of less wave excitation
(fig. 2.3). The requirement for reduced motions and accelerations
of the floating systems is essential because of the influence of
these factors on the process flow in equipment like separation
columns, heat exchangers, etc.
Semi-submersibles are multi-hull column-stabilized
structures: an elevated rectangular platform deck is supported
above the water on an array of vertical columns of minimal water
plane area, which are connected to caissons or longitudinal hulls
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