Corrosion Wastage Modeling for Different Member Locations of Aged Bulk Carriers

Abstract

The paper considers two corrosion wastage models for some pre-specified member locations of several aged bulk carriers. Accordingly, the available statistical data of regular corrosion measurements for existing bulk carriers’ structures have been analyzed, using two simulation models. The first considered model is based on Monte Carlo simulation method and it is developed upon cumulative data collected by measuring eleven structure categories of ten bulk carriers during the period between the twentieth and the thirtieth year of their operational life. The second considered model employs an inverse analysis of the corrosion process in the case of seven bulk carriers’ inner bottoms plating areas at different ages of the ships’ operational life, i.e. their exposure to the corrosion. Both models show certain convergence and enable predicting the steel amounts that are to be removed (replaced) from different corroded structural members in order to keep the ultimate bulk carriers’ both transversal and longitudinal strength within the boundaries of required safety level.