Naslov
Hull girder reliability of an aged oil tanker

Autori
Parunov, Joško ; Mage, Paulo ; Guedes Soares, C.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 27th International Conference on Offshore Mechanics and Artic Engineering, OMAE2008) / - : American Society of Mechanical Engineers (ASME), 2008

ISBN
0-7918-3821-8

Skup
International Conference on Offshore Mechanics and Artic Engineering

Mjesto i datum
Estoril, Portugal, 15.06.2008. - 20.06.2008

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
structural reliability; oil tanker; corrosion

Sažetak
The aim of the paper is to assess hull-girder reliability of an existing single-hull oil tanker after 25 years of service using reliability method and assumptions very similar to those proposed recently by International Maritime Organization (IMO). The evaluation of the wave-induced load effects that occur during long-term operation of the ship in the seaway is carried out in accordance with the International Association of Classification Societies (IACS)- recommended procedure, while transfer functions are calculated using the linear strip theory. The still-water loads are defined on the basis of statistical analysis of data recorded on single-hull oil tankers. The ultimate collapse bending moment of the midship cross section, which is used as the basis for the reliability formulation, is evaluated by progressive collapse analysis and by a single-step procedure according to Common Structural Rules (CSR). The reliability analysis is performed for three states of the hull: as built ship with scantlings of the new ship, CSR corroded state with net thicknesses of the structural members according to the corrosion deduction thickness proposed by CSR and for survey state with scantlings according to the thickness measurements after 25 years of service. The yearly probability of structural failure is calculated using first-order reliability method, while sensitivity analysis and a parametric study are performed to investigate the variability of results with the change of parameters of pertinent random variables within their plausible ranges. Results of the analysis are compared with recommended target reliability indices proposed by IMO and also with the results of the reliability assessment of the new double-hull tanker. Such comparison is possible since similar reliability methods and uncertainty models are employed. Results of the analysis may have several useful applications related to the decision-making aspects of the future of an aged oil tanker.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja

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