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Lifetime Corrosion Loss of Bulk Carriers

Momčilović Nikola, Kovač Nataša, Ivošević Špiro

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2025

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Vol. 19 No. 1

243--249

EN

This paper analyzes the total steel replacement due to corrosion degradation in four Handymax-class bulk carriers, based on corrosion measurements recorded throughout their operational lifespan. Each ship was divided into 11 lightship mass subgroups, enabling detailed examination of cumulative lifetime corrosion losses for both entire ships and individual subgroups. Utilizing similar ship data obtained from the shipyard, the study also provides estimations of the total steel weights of each of lightship subgroups. The findings offer valuable insights into the overall aging effects on ship structures, crucial for maintenance planning, structural integrity assessments, and recycling, especially from the perspective of sustainable shipping. Additionally, the estimated weights of lightship subgroups can serve as reference data for preliminary ship design, aiding in the estimation of lightship weights and potential steel loss due to corrosion.

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A multistate approach to reliability analyses of a ship hull structure

Soszyńska-Budny Joanna, Ivošević Špiro

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2024

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Vol. 18 No. 4

897--904

EN

Structural damage in the form of corrosion, fatigue, damage, cracks and fouling can significantly reduce the structural integrity of ships in navigation and decrease the navigation safety. Therefore, numerous studies aim to improve international rules and regulations, and ensure proper maintenance of ships and timely inspections. Classification societies, flag states and port states strive to conduct appropriate inspections of ships with the aim of preventive detection of defects. Through the application of International Safety Management system, companies strive to improve maintenance systems, monitor the condition of ships and conduct risk assessments to reduce potential accidents and negative consequences for people, material goods and the environment. By means of advanced Structural Health Monitoring, the observation and analysis of the physical, chemical or electrical characteristics of components or systems are conducted over time. Such examinations tend to identify the variations that lead to degradation of the current or future performance of the inspected systems and their components. The condition of hull structures is monitored by mandatory requirements which are prescribed by classification societies e.g. the number of thickness measurements of hull structure areas and elements. The measurements create extensive databases that are further used to monitor the condition of existing ships and predict their future conditions. This study relies on a database of 25 bulk carriers aged between 5 and 25 years. The measurements were performed during regular special surveys on the total of 110 fuel tanks located in double bottom area of ships, which provided 3070 measured data in total. The values of the thickness diminution of steel plates due to corrosion were obtained through the measurements of the thickness of the steel plates by means of ultrasound thickness gauging equipment, in accordance with the rules of classification societies. Based on those rules and allowable substance and extensive corrosion, the paper considers the excessive corrosion values (above 20%) that were identified as failures and required the replacement of corroded surfaces. The multistate approach to the reliability analysis of the steel plates of inner bottom plating and the improvement of reliability after critical conditions showed that the usability of the analyzed ships significantly dropped after 15 years of exploitation.

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Materials with shape memory effect for applications in maritime

Ivošević Špiro, Rebeka Rudolf

Scientific Journal of Polish Naval Academy

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2019

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R. 60 nr 3 (218)

25--41

EN

In this review it is presented the insight of challenges faced by all branches of industry in the new age, and especially the maritime industry, strive for sustainable development, better energy control, use of materials with functional properties such as shape memory, all in the direction of increasing safety and comfort. Therefore, the development of new materials with shape memory, which is associated with the introduction of optimized production and the achievement of better func-tional properties. This leads to new applications in different systems and possible use on devices, which meet the rigorous requirements of the modern industry. The research into new materials with shape memory effect and their applied use in maritime is a challenge that many researchers have encountered in recent decades, and this is why in this paper we look at the basic engineering aspect of these materials and their current as well as future applications in the maritime industry. An overview of several innovations that testify shape memory effect and superelasticity in different maritime fields will be presented in this review.

PL

W artykule przedstawiono badania prowadzone nad nowymi materiałami z pamięcią kształtu. Opisano podstawowe aspekty inżynieryjne tych materiałów, ich właściwości funkcjonalne oraz przyszłe wykorzystanie w obszarze morskim. Dokonano przeglądu niektórych zastosowań materiałów z efektem shape memory alloy (SMA), pokazując ich innowacyjne rozwiązania. Opracowanie optymalnego procesu technologicznego do produkcji materiałów SMA i transfer wiedzy na po-ziomie przemysłowym stworzy nowe perspektywy dla żeglugi morskiej.