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§ 56 Load-bearing structures and maritime systems

Load-bearing structures shall maintain satisfactory safety in use, failure, fatigue and accident limit states. They shall be able to withstand the loads/actions they are exposed to, including loads/actions with an annual likelihood of 10-2 in the failure limit state and the loads/actions that follow from Section 11, in the accident limit state.
Load-bearing structures shall be sufficiently robust to ensure that local damage or failure will not result in unacceptable consequences.
Maritime systems shall be sufficiently robust to ensure that local damage or individual technical or operational faults do not result in unacceptable consequences.
The analyses shall be verified by an organisationally independent party.
Section last changed: 01 January 2014

The standard NORSOK N-001 should be used to fulfil the requirements.
For verification of load-bearing structures as mentioned in the first subsection, the NORSOK N-001 standard Chapter 5.2 should be used.
Location-specific analyses of mobile jack-up facilities should be carried out in accordance with the Norwegian Maritime Authority’s Regulations relating to construction of mobile facilities and DNVGL-OS-C104.
As regards water breakthrough in floating facilities, see Sections 39 and 62. For general provisions, see Sections 5 and 7.
For design of tension legs the standards NORSOK N-001 and N-004 Annex N should be used.
It should also be assessed whether firefighting water from the facility’s sprinkler system or from a vessel may produce unintended changes to weight or stability.
In order to fulfil the requirements for the maritime systems mentioned in the third subsection, vessels with an offshore gangway to simpler facilities should comply with the Norwegian Maritime Authority's circular RSV 17-2016 point 6. The rules for new vessels (vessels category A, cf. the circular point 4) should be used independently of build date.