DNV DNV-OS-C103 [ Active ]

This standard covers structural requirements of column-stabilised units made of steel for worldwide operation and units permanently moored at a site specific location.

The standard covers both the working stress design (WSD) method and the load and resistance factor design method (LRFD).

The following topics are covered:

— design principles

— design loads

— material selection and inspection principles

— strength assessment

— procedures and requirements for units subject to classification services.

This standard has structural requirements for the following:

— scantling control of plates, stiffeners and girders

— yield

— buckling

— fatigue.

The requirements cover the following basic design conditions:

— transit condition

— operation condition

— survival condition

— accidental condition.

This standard uses a deterministic design method. Design by testing and probabilistic design methods are not covered.

The acceptance criteria in this standard are based on a linear elastic strength approach, i.e. material yield stress limit. However, for special structural items it may be acceptable to use the plastic material capacity, i.e. ultimate material limit.

Serviceability requirements related to normal use or durability, e.g. deflections, vibration and functional motions related to operation are not covered in this standard.

Flag state and shelf state requirements are not covered by this standard.

Guidance note:

Flag state and shelf state regulations may include requirements in excess of the provisions of this standard depending on the type, location and intended service of the offshore unit.