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Assessment of Fatigue Failure in FPSO Mooring Systems

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Assessment of Fatigue Failure in FPSO Mooring Systems


Adebanjo Victor Abiola | Ibiba Douglas | Matthew N. O.Sadiku | Uwakwe C. Chukwu | Inegiyemiema Morrisson | Onuh Chukwuka Humphery



Adebanjo Victor Abiola | Ibiba Douglas | Matthew N. O.Sadiku | Uwakwe C. Chukwu | Inegiyemiema Morrisson | Onuh Chukwuka Humphery "Assessment of Fatigue Failure in FPSO Mooring Systems" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-6, October 2022, pp.1711-1724, URL: https://www.ijtsrd.com/papers/ijtsrd52155.pdf

Mooring lines failures are a critical subject in FPSO designs, analysis, and operations. This study aims to achieve this by extending damage calculations results from rain flow analysis to the computation of an appropriate range of Weibull parameter h. The Weibull method is a fatigue analysis method that is done in the frequency domain. Selection of a particular h parameter that will accurately compute damage is a difficult challenge. So, damage calculations can overestimate or underestimate the fatigue damage and fatigue life of mooring lines. Analysis was also carried out in the frequency domain using Dirlik’s method and the results from the two domains compared. Metocean Data for the Gulf of Guinea was obtained and inputted into Orcaflex for analysis. 12 wave classes, current and wind data were extracted and included in a computer model of the FPSO. Rain flow analysis was carried out and the results for all 12 mooring lines in the 12 different wave classes were extracted for analysis. Results from here showed all stresses were within the acceptable limits specified in DNV OS E301 guidelines. Initial analysis was carried out for all 12 wave classes considering Low Frequency (LF) forces alone and another carried out considering Wave Frequency (WF) forces alone for 3 wave classes. The 3 classes selected were in line with DNV Ultimate Limit State (ULS) conditions. Back calculation was used from the fatigue damage results obtained from the analysis and applied to the Weibull equation so an appropriate h parameter can be gotten. Results obtained can be applied to the fatigue analysis of mooring lines within the Gulf of Guinea environment.

FPSO, Dirliks method, Weibull Analysis, Fatigue Analysis


IJTSRD52155
Volume-6 | Issue-6, October 2022
1711-1724
IJTSRD | www.ijtsrd.com | E-ISSN 2456-6470
Copyright © 2019 by author(s) and International Journal of Trend in Scientific Research and Development Journal. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0)

International Journal of Trend in Scientific Research and Development - IJTSRD having online ISSN 2456-6470. IJTSRD is a leading Open Access, Peer-Reviewed International Journal which provides rapid publication of your research articles and aims to promote the theory and practice along with knowledge sharing between researchers, developers, engineers, students, and practitioners working in and around the world in many areas like Sciences, Technology, Innovation, Engineering, Agriculture, Management and many more and it is recommended by all Universities, review articles and short communications in all subjects. IJTSRD running an International Journal who are proving quality publication of peer reviewed and refereed international journals from diverse fields that emphasizes new research, development and their applications. IJTSRD provides an online access to exchange your research work, technical notes & surveying results among professionals throughout the world in e-journals. IJTSRD is a fastest growing and dynamic professional organization. The aim of this organization is to provide access not only to world class research resources, but through its professionals aim to bring in a significant transformation in the real of open access journals and online publishing.

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