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Consequence assessment considerations for toxic natural gas dispersion modeling
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Nair, SreeRaj R., Ogbeifun, Noma O. and Wen, Jennifer X. (2022) Consequence assessment considerations for toxic natural gas dispersion modeling. Journal of Loss Prevention in the Process Industries, 78 . 104792. doi:10.1016/j.jlp.2022.104792 ISSN 0950-4230.
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Official URL: http://dx.doi.org/10.1016/j.jlp.2022.104792
Abstract
The numerical simulation of gas dispersion and estimation of consequence impact is of importance in Oil and Gas industry's process safety management. For natural gas fields with toxic components like Hydrogen sulfide, the toxicity impact zone drives business decisions related to equipment design, facility siting, layout, land use planning, and emergency response measures. Proprietary tools or empirical models which are calibrated using experiment database are often used for carrying out consequence modeling.
The selection of a software tool and a suitable dispersion model, based on the cloud behavior, at the source of dispersion is critical for the impact zone estimation. It is observed that, the fluid phase and the cloud density are key for determining the appropriate dispersion model. Incorrect parameter selection could lead to an inaccurate consequence impact zone estimation. This in turn could result in disproportionate process risk management efforts especially for toxic impacts from exposure to a very low concentration.
This paper discusses the results from consequence modeling studies done for a selected set of toxic natural gas release events related to onshore pipeline transfer using approved software. The study analyses the modeling inputs, parameters and determines the key release source terms and atmospheric parameters that impacts the estimation of impact zones. The study determined that the natural gas dispersion behaviour is dependent on the natural gas molar mass and the composition of Hydrogen sulfide. The study provides the guidance on overcoming uncertainty in dispersion modeling through sensitivity assessments and lists key parameters to be subjected for toxic natural gas dispersion modeling sensitivity analysis.
Item Type: | Journal Article | ||||||||||
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Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||
Library of Congress Subject Headings (LCSH): | Natural gas, Natural gas -- Mathematical models, Natural gas pipelines -- Safety regulations, Gas pipelines -- Safety measures, Atmospheric diffusion | ||||||||||
Journal or Publication Title: | Journal of Loss Prevention in the Process Industries | ||||||||||
Publisher: | Elsevier Ltd | ||||||||||
ISSN: | 0950-4230 | ||||||||||
Official Date: | August 2022 | ||||||||||
Dates: |
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Volume: | 78 | ||||||||||
Number of Pages: | 13 | ||||||||||
Article Number: | 104792 | ||||||||||
DOI: | 10.1016/j.jlp.2022.104792 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||
Date of first compliant deposit: | 5 July 2022 | ||||||||||
Date of first compliant Open Access: | 5 July 2022 |
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