A Probabilistic Time-Variant Corrosion Wastage Model for Seawater Ballast Tank

Noor, Norhazilan; Yahaya, Nordin; Smith, George; Nor, Shadiah
June 2013
Arabian Journal for Science & Engineering (Springer Science & Bu;Jun2013, Vol. 38 Issue 6, p1333
Academic Journal
Probabilistic-based dynamic model of corrosion wastage has been a topic of interest in the past few decades due to the natural complexity of corrosion mechanism and the current tendency by structure owner to incorporate risk-based methodology into their existing maintenance scheme. This paper deals with the modelling of time-variant dynamic behaviour of corrosion pits in ship'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 the corrosion rate such as environmental factors, material properties and operational condition. A set of metal loss data from preceding published literatures was reused to establish the corrosion wastage model. To appropriately express the high variability of corrosion wastage which contributes to the uncertainties in corrosion assessment, the Weibull probability distributions with time variant-scale parameter were proposed as the probabilistic-based model to predict the growth of corrosion pit in seawater ballast tank. The deterministic linear regression equation of averaged pit depth was integrated into the probability density function equation to make a time-variant prediction model. Based on the results, it is obvious that the provided information from the ship inspections is full of uncertainties, due 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 still able to purposely demonstrate the optimisation of the data for corrosion growth prediction. The predicted data as compared with actual data yield results with moderate accuracy based on the Root-Mean-Square-Error (RMSE), yet is still promising provided that more high-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 purposes.


Related Articles

  • Properties and Effects of Water-Soluble Inhibitors on the Corrosion Rates of Structural Metals. Lambrakos, S. G.; Trzaskoma-Paulette, P. P.; Cooper, K. P.; Tran, N. E. // Journal of Materials Engineering & Performance;Dec2004, Vol. 13 Issue 6, p766 

    The effects of six commercial water-soluble inhibitor formulations on the corrosion rates of aluminum and steel in seawater were determined. Corrosion rates were measured by the weight loss of specimens following long-term immersion in artificial seawater containing inhibitors at the developer's...

  • Efficiency Criterion of Corrosion Inhibitors of Carbon Steel in Seawater. Habib, K. // Advances in Petroleum Exploration & Development;12/31/2013, Vol. 6 Issue 2, p56 

    A criterion of the efficiency evaluation of corrosion inhibitors of metallic samples in aqueous solutions was proposed for the first time.The criterion was derived based on calculating the limit of ratio value of the resistivity of carbon steel sample in inhibited seawater (ρins) to the...

  • Frequent Failures of Motor Shaft in Seawater Desalination Plant: Some Case Studies. Malik, Anees; Al-Fozan, Saleh; Al-Muaili, Fahd; Al-Hajri, Mohammad // Journal of Failure Analysis & Prevention;Apr2013, Vol. 13 Issue 2, p144 

    The failure of a shaft from a motor in a pump or a compressor has been a phenomenon of common occurrence in seawater desalination plants. The origin of the problem in majority of cases is either the inability of the material to withstand the level of dynamic stresses to which shaft is subjected...

  • Corrosion failure 90/10 cupronickel tubes in a desalination plant. Elragei, O.; Elshawesh, F.; Ezuber, Hosni M. // Desalination & Water Treatment;Sep2010, Vol. 21 Issue 1-3, p17 

    This paper presents finding of a failure investigation on a heat exchanger tubes in a desalination plant. Fabricated from Type 90-10 copper-nickel alloy, the tubes experienced sever corrosion after one year of operation. Leaks were observed due to pitting attack requiring repairs and eventual...

  • A QUALITATIVE TEST FOR IRON CORROSION PRODUCTS. Argo, James // Studies in Conservation;Nov81, Vol. 26 Issue 4, p140 

    A simple, low cost alternative to X-ray diffraction for the identification of corrosion products on marine iron artifacts is based on the differential solubility of the minerals in pure acetyl acetone and on the color of the product formed.

  • The Corrosion Inhibition Of Aluminium In 3.5% NaCl By Diisopropyl Thiourea. N. V. Lakshmi; N. Arivazhagan; S. Karthikeyan // International Journal of ChemTech Research;Apr-Jun2013, Vol. 5 Issue 2, p1959 

    The Inhibition of Aluminum corrosion in 3.5% NaCl solution using diisopropyl thiourea (DISOTU) has been reported by weight loss, electrochemical polarization technique, impedance method and quantum mechanical measurement. It was found that the compound effectively reduces the aluminum corrosion...

  • Corrosion Studies of Trimetallic Material in Synthetic Sea Water Environment. M., Arivarasu; K., Devendranath Ramkumar; N., Arivazhagan // International Journal of ChemTech Research;Oct/Nov2014, Vol. 6 Issue 11, p4764 

    In the present study, the corrosion behaviour of trimetallic joint obtained from gas tungsten arc welding process in conventional mode and in pulsed mode has been investigated. The candidate materials for these studies are aeronautical steel AISI 4340 and austenitic stainless steel AISI 304L...

  • Inter-relationships between corrosion and mineral-scale deposition in aqueous systems. Hodgkiess, T. // Water Science & Technology;2004, Vol. 49 Issue 2, p121 

    The processes of corrosion and scale deposition in natural and process waters are often linked and this paper considers a number of instances of interactions between the two phenomena. In some circumstances a scale layer (e.g. calcium carbonate) can be advantageously utilised as a...

  • Identification of Corrosion Products Due to Seawater and Fresh Water. Gismelseed, A.; Elzain, M.; Yousif, A.; Al Rawas, A.; Al-Omari, I. A.; Widatallah, H.; Rais, A. // Hyperfine Interactions;2004, Vol. 156/157 Issue 1-4, p487 

    Mössbauer and X-ray diffraction (XRD) measurements were performed on corrosion products extracted from the inner surface of two different metal tubes used in a desalination plant in Oman. One of the tubes corroded due to the seawater while the second was corroded due to fresh water. The...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics