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Methodology to analyse LNG spill on steel structure in congested marine offshore facility

Citation

Baalisampang, T and Khan, F and Abbassi, R and Garaniya, V, Methodology to analyse LNG spill on steel structure in congested marine offshore facility, Journal of Loss Prevention in The Process Industries, 62 Article 103936. ISSN 0950-4230 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 Elsevier Ltd.

DOI: doi:10.1016/j.jlp.2019.103936

Abstract

The cryogenic temperature of LNG induces unexpected thermal stress on a metallic structure when LNG comes in contact with it. The induced thermal stress may combine with other operational stress causing the system to face abnormally high stress rates. Furthermore, small cracks, imperfections or design flaws can propagate at high rate under the new increased stress condition. This may lead to catastrophic failure of the structure. In this study, a methodology is proposed for the assessment of the impact of a fugitive LNG spill on a typical steel structure. The study outlines an insight into the structural integrity assessment of the structure during an LNG spill. The focus of the study is to model an LNG pool formation in a complex offshore structure using Flame Acceleration Simulator (FLACS), and to analyse the temperature profile of the pool using thermal analysis. The thermal stress obtained from the transient analysis is considered as a load for LNG spill impact assessment. Ten different semi-elliptical crack sizes are considered to analyse the impact of thermal stress on crack propagation. The outcome of this study reveals that the fugitive release of LNG does not cause immediate crack propagation, however, it has a significant impact on the operational life of the structure. This study confirms that the fugitive release of LNG is a serious hazard for structural integrity and demands effective preventive and/or control measures.

Item Details

Item Type:Refereed Article
Keywords:LNG spill, FLACS, finite element analysis, crack propagation, fatigue failure
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ocean Engineering
Objective Division:Environment
Objective Group:Environmental and Natural Resource Evaluation
Objective Field:Environmental Management Systems
UTAS Author:Baalisampang, T (Mr Til Baalisampang)
UTAS Author:Khan, F (Professor Faisal Khan)
UTAS Author:Garaniya, V (Dr Vikram Garaniya)
ID Code:134921
Year Published:2019
Web of Science® Times Cited:1
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2019-09-13
Last Modified:2020-03-11
Downloads:0

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