DEVELOPMENT OF SECOND GENERATION INTACT STABILITY CRITERIA

The whole process of design and further operation of the commercial vessels have been subjected to the significant changes during past decades. All of those changes together with the serious impact they have on the intact stability performance of vessels, have motivated the specialists of the IMO to develop the second generation criteria of intact stability. Among the most important modes of stability failure, considered primary, we would note the pure loss of ship stability, broaching-to and parametric roll resistance.

The stability criteria addressed in this publication have been designed in a multi-layered structure, with the first two layers consisting of level 1/2 vulnerability criteria mainly used for the preliminary checks of the risk of dynamic stability failure during the design stage. The present document describes the valuable contribution of the US specialists to the development of those criteria including all stability failure modes. Sufficient level of the intact stability of the vessel is the most basic and important requirement.

The working group dealing with the development of the second generation criteria for the intact stability of ships, has outlines three major modes of stability failures. One of the modes is the stability of the vessel under dead-ship conditions, as defined bi the corresponding SOLAS regulation contained in II-1/3-8. The other two modes cover the restoring arm variation and maneuvering related problems...