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DNV-OS-C201 Structural Design of Offshore Units (WSD method)
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Sec.12
J 400 Air gap
Sec.12 J
401 Clearance between the hull structure and the wave crest is
normally to be ensured for the operating position.
Sec.12 J
402 The requirement to the length of the leg is that the distance
between the lower part of the deck structure in the operating position
and the crest of the maximum design wave, including astronomical
and storm tides, is not to be less than 10% of the combined
storm tide, astronomical tide and height of the design wave above the
mean low water level, or 1.2 m, whichever is smaller. Expected subsidence
of the structure shall be taken into account.
Sec.12 J
403 Crest elevation above still water level is given in Fig.1.
Sec.12 J
404 A smaller distance may be accepted if wave impact forces on
the deck structure are taken into account in the strength and overturning
analysis.
Sec.12 J
405 Clearance between the structure and wave shall be ensured
in floating condition for appurtenances appendices such as helicopter
deck, etc.
Fig. 1 Crest elevation
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