THE WEIBULL TIME-DEPENDENT GROWTH MODEL OF MARINE CORROSION IN SEAWATER BALLAST TANK
DOI:
https://doi.org/10.11113/mjce.v19.15752Keywords:
Corrosion, Weibull probability, Ballast TankAbstract
: This paper demonstrates the application of the probability distributions in modelling the time-dependent growth behaviour of corrosion pits in vessel’s seawater ballast tanks. The proposed model is capable of projecting the likely growth pattern of corrosion pits in the future by eliminating the dependent factors governing to corrosion rate such as environmental factors, properties of material and operational condition. To express appropriately the high variability of corrosion wastage which contributes to the uncertainties in corrosion assessment, the Weibull probability distributions were proposed which are able to predict the growth of corrosion pit in seawater ballast tank. It is obvious that the provided information from the vessel inspections is full of uncertainties, owing to the nature of marine corrosion as reflected by the poor correlation result of averaged depth against time. In spite of the drawback, the research is able to demonstrate the optimisation of the data purposely for corrosion growth prediction. The predicted data as compared to actual data yields results with moderate accuracy based on RootMean-Square-Error (RMSE), yet still promising provided that better quality data can become available in the future. The proposed probabilistic models are intended to simplify the modelling process so that the available data can be fully utilised for prediction and structural evaluation purposesReferences
Melchers R.E. (1999) Corrosion Modelling for Steel Structures, Journal of Constructional Steel Research, 52 : 3-19.
Noor, M.N. (2007) A Generic Assessment Approach to the Analysis of Corrosion Data and its Application on Structure Reliability, PhD Thesis, Heriot-Watt University, Edinburgh.
Paik J.K. (2004) Corrosion Analysis of Seawater Ballast Tank Structures, International Journal of Maritime Engineering, Vol. 146 Part A1 : 1-12.
Paik J.K. and Thayamballi A.K. (2002) Ultimate Strength of Ageing Ships, Journal Engineering for the Maritime Environment, Vol. 216 : 57-77.
Paik J.K, Thayambali A.K., Park Y.I. (2004) A Time-dependent Corrosion Wastage Model for Seawater Ballast Tank Structures of Ships, Corrosion Science, 46 (2) : 471-486.
Wang G., Spencer J., Elsayed T. (2003) Estimation of Corrosion Rates of Structural Members in
Oil Tankers, Proceedings of OMAE 2003, 22nd International Conference on Offshore Mechanics and Arctic Engineering, Cancun, Mexico.