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Accidental release of Liquefied Natural Gas in a processing facility: effect of equipment congestion level on dispersion behaviour of the flammable vapour

Baalisampang, T, Abbassi, R, Garaniya, V ORCID: 0000-0002-0090-147X, Khan, F ORCID: 0000-0002-5638-4299 and Dadashzadeh, M 2019 , 'Accidental release of Liquefied Natural Gas in a processing facility: effect of equipment congestion level on dispersion behaviour of the flammable vapour' , Journal of Loss Prevention in The Process Industries, vol. 61 , pp. 237-248 , doi: 10.1016/j.jlp.2019.07.001.

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Abstract

An accidental leakage of Liquefied Natural Gas (LNG) can occur during processes of production, storage andtransportation. LNG has a complex dispersion characteristic after release into the atmosphere. This complexbehaviour demands a detailed description of the scientific phenomena involved in the dispersion of the releasedLNG. Moreover, a fugitive LNG leakage may remain undetected in complex geometry usually in semi-confined orconfined areas and is prone to fire and explosion events. To identify location of potential fire and/or explosionevents, resulting from accidental leakage and dispersion of LNG, a dispersion modelling of leakage is essential.This study proposes a methodology comprising of release scenarios, credible leak size, simulation, comparison ofcongestion level and mass of flammable vapour for modelling the dispersion of a small leakage of LNG and itsvapour in a typical layout using Computational Fluid Dynamics (CFD) approach. The methodology is applied to acase study considering a small leakage of LNG in three levels of equipment congestion. The potential fire and/orexplosion hazard of small leaks is assessed considering both time dependent concentration analysis and areabased model. Mass of flammable vapour is estimated in each case and effect of equipment congestion on sourceterms and dispersion characteristics are analysed. The result demonstrates that the small leak of LNG can createhazardous scenarios for a fire and/or explosion event. It is also revealed that higher degree of equipmentcongestion increases the retention time of vapour and intensifies the formation of pockets of isolated vapourcloud. This study would help in designing appropriate leak and dispersion detection systems, effective monitoring procedures and risk assessment

Item Type: Article
Authors/Creators:Baalisampang, T and Abbassi, R and Garaniya, V and Khan, F and Dadashzadeh, M
Keywords: complex layout, LNG, fugitive leakage, dispersion modelling, CFD, FLACS
Journal or Publication Title: Journal of Loss Prevention in The Process Industries
Publisher: Elsevier
ISSN: 0950-4230
DOI / ID Number: 10.1016/j.jlp.2019.07.001
Copyright Information:

Copyright 2019 Elsevier Ltd.

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