engleski

Corrosion wastage of oil tankers – A case study of an aged ship

The paper on the first place examines the corrosion wastage of a single-hull oil tanker after 25 years of service. Next it relates the corrosion wastage statistics for both cargo and ballast tanks of the case study to the proposal of „ rule“ corrosion deduction thickness in new Common Structural Rules (CSR). Finally, it assesses the effect of measured corrosion of ship scantlings on the ultimate bending capacity of the hull girder and compares the two methods for ultimate strength calculation proposed in CSR – the HULS-1 single step procedure and the progressive collapse analysis (PCA). In addition to the global strength analysis of the ship hull girder with respect to yielding and buckling the paper also investigates the impact of corrosion wastage on ultimate lateral pressure due to local bending of plating. The conclusion reveals the long-term non-linear theoretical model of corrosion wastage that is fitted to measured corrosion on the ship. The findings are hopefully useful in prediction of corrosion propagation after conversion of oil tanker to FPSO.

oil tanker; corrosion; ultimate strength

nije evidentirano