1.2 Dynamic stability phenomena in waves
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Statutory Documents - IMO Publications and Documents - International Codes - 2008 IS Code – International Code on Intact Stability, 2008 - Part A – Mandatory Criteria - Chapter 1 – General - 1.2 Dynamic stability phenomena in waves

1.2 Dynamic stability phenomena in waves

 Administrations shall be aware that some ships are more at risk of encountering critical stability situations in waves. Necessary precautionary provisions may need to be taken in the design to address the severity of such phenomena. The phenomena in seaways which may cause large roll angles and/or accelerations have been identified hereunder.

 Having regard to the phenomena described in this section, the Administration may for a particular ship or group of ships apply criteria demonstrating that the safety of the ship is sufficient. Any Administration which applies such criteria should communicate to the Organization particulars thereof. It is recognized by the Organization that performance oriented criteria for the identified phenomena listed in this section need to be developed and implemented to ensure a uniform international level of safety.

Parent topic: Chapter 1 – General

1.2.1 Righting lever variation

 Any ship exhibiting large righting lever variations between wave trough and wave crest condition may experience parametric roll or pure loss of stability or combinations thereof.

1.2.2 Resonant roll in dead ship condition

 Ships without propulsion or steering ability may be endangered by resonant roll while drifting freely.

1.2.3 Broaching and other manoeuvring related phenomena

 Ships in following and quartering seas may not be able to keep constant course despite maximum steering efforts which may lead to extreme angles of heel.

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