Structural design of self-elevating units - LRFD method
|Publication Date:||1 July 2022|
This standard covers requirements for material and structural strength self-elevating units.
A self-elevating unit is designed to function in a number of modes, e.g. transit, operational and survival. This standard covers design criteria for the following items:
- intact condition, structural strength
- damaged condition, structural strength
- fatigue strength
- accidental damage
- air gap
- overturning stability
- watertight integrity and hydrostatic stability.
Limiting design criteria when going from one mode to another shall be established and clearly documented.
Serviceability (SLS) condition is not covered in this standard.
Structural design covering marine operation sequences is not covered in this standard. Marine operations may be based on DNV-ST-N001.
Flag and shelf state requirements are not covered by this standard.
Governmental regulations may include requirements in excess of the provisions of this standard depending on the type, location and intended service of the offshore unit or installation. The 100 year return period is used to ensure harmonisation with typical shelf state requirements and the code for the construction and equipment of mobile offshore drilling units (MODU code).
In case of conflict between requirements given in this standard and other DNV documents, the requirements given in this standard prevail.