Consequences of the Improved Wave Statistics on a Hull Girder Reliability of Double Hull Oil Tankers

Author:

Parunov Joško1ORCID,Mikulić Antonio1ORCID,Ćorak Maro2ORCID

Affiliation:

1. Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, Croatia

2. Maritime Department, University of Dubrovnik, 20000 Dubrovnik, Croatia

Abstract

This paper investigates the change in hull girder failure probabilities and partial safety factors caused by the implementation of the new procedure for direct computation of wave loads recommended by the International Association of Classification Societies (IACS). Differences between new and previous procedures are primarily related to the different associated scatter diagrams, and secondarily due to the assumptions on wave spectrum, wave energy spreading, and ship speed. This study performs a comparative structural reliability analysis of the global longitudinal bending of five oil tankers of different sizes between two procedures for wave load computation. Firstly, failure probabilities are compared, and secondly, modified partial safety factors are proposed, resulting in similar failure probabilities according to two separate procedures. It is found that implementation of the new revision of the IACS procedure for direct computation of wave loads results in a reduction of the minimum required ultimate vertical bending capacity of a ship hull by 10%. In addition to the novel investigation of the safety of oil tankers using a revised wave scatter diagram, this study offers a new rapid method for calculation of extreme vertical wave bending moments based on the regression of the parameters of the Weibull function, used for the long-term probability distribution of wave-induced loads.

Funder

Croatian Science Foundation

Publisher

MDPI AG

Reference30 articles.

1. International Association of Classification Societies (IACS) (2024, February 21). Common Structural Rules for Double Hull Oil Tankers. Available online: https://iacs.org.uk/resolutions/common-structural-rules/02-csr-for-double-hull-oil-tankers-full-text.

2. International Association of Classification Societies (IACS) (2024, February 21). Technical Background Documents for Oil Tanker CSR (version Jan 06): TB FOR SECTION 9/1. Available online: https://iacs.org.uk/resolutions/common-structural-rules/11-technical-background-documents-for-oil-tanker-csr-version-jan-06.

3. Approximate assessment of the ultimate longitudinal strength of the hull girder;Gordo;J. Ship Res.,1996

4. International Association of Classification Societies (IACS) (2024, February 21). Common Structural Rules for Bulk Carriers and Oil Tankers. Available online: https://iacs.org.uk/resolutions/common-structural-rules/csr-for-bulk-carriers-and-oil-tankers.

5. Collette, M., Caridis, P., Georgiev, P., Hørte, T., Jeong, H.K., Kurt, R.E., Ilnytskiy, I., Okada, T., Randall, C., and Sekulski, Z. (2022, January 11–15). Committee IV.1: Design Principles and Criteria. Proceedings of the 21st International Ship and Offshore Structures Congress, Vancouver, BC, Canada. Paper Number: SNAME-ISSC-2022-COMMITTEE-IV-1.

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