3.4 Subdivision and damage stability
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Statutory Documents - IMO Publications and Documents - International Codes - 1979 MODU Code – Code for the Construction and Equipment of Mobile Offshore Drilling Units – Resolution A.414(XI) - Chapter 3 – Subdivision, Stability and Freeboard - 3.4 Subdivision and damage stability

3.4 Subdivision and damage stability

  3.4.1 The unit should have sufficient freeboard and be subdivided by means of watertight decks and bulkheads to provide sufficient buoyancy and stability to withstand in general the flooding of anyone compartment in any operating or transit condition consistent with the damage assumptions set out in 3.5.

  3.4.2 The unit should have sufficient reserve stability in a damaged condition to withstand the wind heeling moment based on a wind velocity of 25.8 metres per second (50 knots) superimposed from any direction. In this condition the final waterline, after flooding, taking into account sinkage, trim and heel should be below the lower edge of any opening through which progressive flooding may take place.

  3.4.3

  • .1 The requirements of 3.4.1 and 3.4.2 should be determined by calculations which take into consideration the proportions and design characteristics of the unit and the arrangements and configuration of the damaged compartments. In making these calculations, it should be assumed that the unit is in the worst anticipated service condition as regards stability and is floating free of mooring restraints.

  • .2 The ability to reduce heeling angles by pumping out or ballasting compartments or application of mooring forces, etc., should not be considered as alleviating the requirements.

Parent topic: Chapter 3 – Subdivision, Stability and Freeboard
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