§ 62 Stability
Floating facilities and vessels with an offshore gangway to simpler facilities shall have buoyancy and stability in intact and damaged condition.
The facilities shall withstand filling of at least one watertight room against the sea, a room that is wholly or partly below the water line, or rooms that contain piping systems connected to the sea. Moreover, the facility shall withstand collision damage on at least one watertight bulkhead in exposed areas. Semi-submersible facilities shall have reserve buoyancy in the deck.
Piping systems within the collision area shall be regarded as damaged.
There shall be weight control systems on floating facilities, which ensure that the weight, weight distribution and centre of gravity are within the design specifications. Equipment and structure sections shall be secured against displacement that can influence stability.
Section last changed: 01 January 2016
To fulfil the requirements to buoyancy and stability as mentioned in the first and second subsection, Section 8 up to and including Section 51 of the Norwegian Maritime Authority’s Regulations relating to stability, watertight subdivision and watertight/weathertight closing means on mobile facilities (in Norwegian only) should be used. Moreover, the dimensioning extent of the damage should be based on an assessment of possible fault modes.
For design of facilities as regards stability, the NORSOK N-001 standard Chapter 7.8 should be used.
For requirements regarding the design of ballast systems, see Section 39.
In order to fulfil the stability requirements for vessels with an offshore gangway to simpler facilities mentioned in the first subsection, the vessel should comply with the Norwegian Maritime Authority's circular 10-2022 point 6. The rules for new vessels (vessels category A, cf. point 4 of the circular) should be used independently of build date.