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Monday, December 18, 2017

IACS Comments on MOL Comfort Report

March 6, 2015

Photo: RINA

Photo: RINA

The International Association of Classifications Societies (IACS) informs it will study the final report issued in Japan by the Committee on Large Container Ship Safety (CLCSS), which concludes that the Mol Comfort break up possibly occurred because the sea loads exceeded the hull girder ultimate strength at the time of the casualty, as well as the recommendations formulated in the document, and will make public the results of this examination.

At the beginning of 2014, IACS launched an expert group on structural safety of containerships, which carried out a post MOL Comfort review, also taking into account a number of past casualties.

This work has resulted in the development of two new IACS Unified Requirements (URs): UR S11A which is a longitudinal strength standard for Containerships and URS 34 dealing with functional requirements for direct analysis by Finite Element.

The ongoing work had already taken into account the CLCSS recommendations. The URs take into account the effect of lateral loads on biaxial buckling of stiffened panels (a phenomenon preceding loss of ultimate strength as correctly indicated in the report) and whipping on vertical bending strength. With respect to the third recommendation of the report (representation of technical backgrounds), IACS can also confirm that Class Societies rules already consider the strength of the ship under specified operating and environmental conditions corresponding to its entire life.

These two URs will be finalized in the coming months. IACS Unified Requirements are minimum common technical requirements to be incorporated into the rules of each individual member, and are not intended to address all the strength aspects of hull structures, which remains the function and responsibility of each class society.

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