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

Til Baalisampang, Faisal Khan , Rouzbeh Abbassi, Vikram Garaniya

Research output: Contribution to journalArticleResearchpeer-review

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.
LanguageEnglish
Article number103936
Pages1-11
Number of pages11
JournalJournal of Loss Prevention in the Process Industries
Volume62
DOIs
Publication statusPublished - Nov 2019

Fingerprint

Steel
thermal stress
Hazardous materials spills
Steel structures
Liquefied natural gas
steel
Hot Temperature
Thermal stress
Structure Collapse
thermal analysis
Structural integrity
methodology
Temperature
temperature profiles
control methods
Crack propagation
Cracks
Defects
Outcome Assessment (Health Care)
Spill

Keywords

  • LNG spill
  • FLACS
  • Finite element analysis
  • Crack propagation
  • Fatigue failure

Cite this

@article{a54ce49862304b50af8b1b93be7abbcb,
title = "Methodology to analyse LNG spill on steel structure in congested marine offshore facility",
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.",
keywords = "LNG spill, FLACS, Finite element analysis, Crack propagation, Fatigue failure",
author = "Til Baalisampang and Faisal Khan and Rouzbeh Abbassi and Vikram Garaniya",
year = "2019",
month = "11",
doi = "10.1016/j.jlp.2019.103936",
language = "English",
volume = "62",
pages = "1--11",
journal = "Journal of Loss Prevention in the Process Industries",
issn = "0950-4230",
publisher = "Elsevier",

}

Methodology to analyse LNG spill on steel structure in congested marine offshore facility. / Baalisampang, Til ; Khan , Faisal ; Abbassi, Rouzbeh; Garaniya, Vikram .

In: Journal of Loss Prevention in the Process Industries, Vol. 62, 103936, 11.2019, p. 1-11.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Methodology to analyse LNG spill on steel structure in congested marine offshore facility

AU - Baalisampang, Til

AU - Khan , Faisal

AU - Abbassi, Rouzbeh

AU - Garaniya, Vikram

PY - 2019/11

Y1 - 2019/11

N2 - 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.

AB - 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.

KW - LNG spill

KW - FLACS

KW - Finite element analysis

KW - Crack propagation

KW - Fatigue failure

UR - http://www.scopus.com/inward/record.url?scp=85070686167&partnerID=8YFLogxK

U2 - 10.1016/j.jlp.2019.103936

DO - 10.1016/j.jlp.2019.103936

M3 - Article

VL - 62

SP - 1

EP - 11

JO - Journal of Loss Prevention in the Process Industries

T2 - Journal of Loss Prevention in the Process Industries

JF - Journal of Loss Prevention in the Process Industries

SN - 0950-4230

M1 - 103936

ER -