Evaluation of Thickness Diminution in Steel Plates for the Assessment of Structural Condition of Ships in Service

概要

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This paper presents a methodology for the evaluation of corrosion that consists of: 1. a theoretical model which simulates the progress of corrosion in steel plates during a ship's life, 2. statistical analysis of a database of corrosion wastage collected through thickness measurements in order to estimate the probable amount of corrosion of each member at the age of the ship's design life (normally 20 years) using the simulation model at a cumulative probability level that is properly set on the database, and 3. analysis of the causes of corrosion in relation to the corrosive environments to which each member is exposed to in order to determine the amount of corrosion for each cause of the corrosion such as the location of the members which gives different corrosion influence using multi-parametric simultaneous linear equations. Further, this paper suggests a rational corrosion deduction for direct strength calculation under net scantling design concept and its technical background as well as the corrosion margin that is to be the wastage limit for local members based on the estimated amount of corrosion.
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