'MDPI AG'
Evaluation of the Corrosion Depth of Double Bottom Longitudinal Girder on Aging Bulk Carriers
2022
The longitudinal girder (LG) between fuel oil tanks (FOT) and water ballast tanks in the double bottoms of ships represent critical structural parts whose watertight nature could be harmed by corrosion, thus, causing the pollution of water ballast tanks and adjacent areas. The new common structural rules (CSR) define the minimum thickness values of structural elements and corrosion margins. The assessment of the deviations from the prescribed values during ship operation could optimize the prescribed criteria. Assuming that corrosive processes begin after four years of operation, the paper analyzes a linear model that describes the percentage of plate wear as a function of the built-in thickness of LG of FOT. The research included 20 ships and provided the database for 1918 corrosion depth values. The gauging records included the average values of the original thickness of steel plates grouped in three intervals (11–13 mm, 13–15 mm, 15–18 mm). Based on the difference between the built-in and subsequently measured values, the paper analyzes the percentage of thickness reduction due to corrosion, concerning the original plate thickness. The findings of the research should facilitate the optimization of corrosion margins and prevent potential structural collapse and pollution
'MDPI AG'
Evaluation of the Corrosion Depth of Double Bottom Longitudinal Girder on Aging Bulk Carriers
The longitudinal girder (LG) between fuel oil tanks (FOT) and water ballast tanks in the double bottoms of ships represent critical structural parts whose watertight nature could be harmed by corrosion, thus, causing the pollution of water ballast tanks and adjacent areas. The new common structural rules (CSR) define the minimum thickness values of structural elements and corrosion margins. The assessment of the deviations from the prescribed values during ship operation could optimize the prescribed...
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2022
Vukelić, Goran
,
Momčilović, Nikola
,
Kovac, Nataša
,
Ivosević, Spiro
'Association for Promotion and Development of Maritime Industries'
The Analyses of the Rate of Pitting Corrosion of a NiTi Rod in a Natural Marine Environment
The analysis of the behaviour of new materials in the natural environment is important for their
application and commercial use. In order to explore the application of Shape Memory Alloys in the
Maritime industry, this research focuses on the corrosive behaviour of the NiTi rod that was produced
by means of a continuous casting process. The experiment included three samples of NiTi rods that
were exposed to the marine environment for 6, 12 and 18 months at a depth of 3 metres below the
surface....
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English
2022
Majerič, Peter
,
Vastag, Gyöngyi
,
Rudolf, Rebeka
,
Kovac, Nataša
,
Ivosević, Spiro
'Faculty of Mechanical Engineering and Naval Architecture, Univ. of Zagreb'
ANALYSIS OF CORROSION DEPTH PERCENTAGE ON THE INNER BOTTOM PLATES OF AGING BULK CARRIERS WITH AN AIM TO OPTIMIZE CORROSION MARGIN
To ensure the better structural integrity and maximum safety of bulk carriers in the ship design phase, an appropriate corrosion margin is introduced by the classification societies, which should enable the exploitation of ships during the projected 25-year life cycle. The new Common Structural Rules introduce even higher corrosion margin value to ensure the structural integrity of the ship. This directly affects the increase in hull weight and thus the need for more total installed power and higher...
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English
2021
Vukelić, Goran
,
Momčilović, Nikola
,
Kovac, Nataša
,
Ivosević, Spiro
'Faculty of Mechanical Engineering and Naval Architecture, Univ. of Zagreb'
Analysis of corrosion depth percentage on the inner bottom plates of aging bulk carriers with an aim to optimize corrosion margin
To ensure the better structural integrity and maximum safety of bulk carriers in the ship design phase, an appropriate corrosion margin is introduced by the classification societies, which should enable the exploitation of ships during the projected 25-year life cycle. The new Common Structural Rules introduce even higher corrosion margin value to ensure the structural integrity of the ship. This directly affects the increase in hull weight and thus the need for more total installed power and higher...
Download
English
2021
Vukelić, Goran
,
Momčilović, Nikola
,
Kovac, Nataša
,
Ivosević, Spiro
