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Deluge and gas explosion risk management: A decision support framework

Nilsson, Rasmus (2006) In LUTVDG/TVBB--5219--SE VBR920
Division of Fire Safety Engineering
Risk Management and Safety Engineering
Division of Risk Management and Societal Safety
Abstract
On offshore installations for oil- and gas exploration, fire-water deluge systems are often installed to mitigate the effect in case of fires. Recent research has shown that the deluge can also be used to mitigate explosion consequences by activating deluge on gas detection. The effect of deluge on the explosion risk is however very complex and could in some cases lead to increased explosion risk instead of risk reduction.

This thesis puts the problem of explosion risk management and deluge into a decision making context and investigates different aspects of relevance to the decision on if deluge should be used as explosion risk reduction measure or not. A framework has been derived on how to produce a decision support which reflects... (More)
On offshore installations for oil- and gas exploration, fire-water deluge systems are often installed to mitigate the effect in case of fires. Recent research has shown that the deluge can also be used to mitigate explosion consequences by activating deluge on gas detection. The effect of deluge on the explosion risk is however very complex and could in some cases lead to increased explosion risk instead of risk reduction.

This thesis puts the problem of explosion risk management and deluge into a decision making context and investigates different aspects of relevance to the decision on if deluge should be used as explosion risk reduction measure or not. A framework has been derived on how to produce a decision support which reflects both the decision makers preferences and the scientific sound methods of calculating the explosion risk with and with-out deluge. The four most important features of the framework include a course decision analysis, the use of computational fluid dynamics to quantify the consequences, Monte Carlo analysis and the application of the NORSOK Z-013 standard. The framework also includes a cost- benefit analysis model and a model to estimate the time from start of leakage to efficiently activated deluge.

The framework was then tested practically by applying it in a case study of an installation in the North Sea. During this exercise, problems and opportunities of improving the framework became obvious. Based on this hindsight knowledge, the framework was improved. A recommendation for the case study object is also presented. (Less)
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author
Nilsson, Rasmus
supervisor
organization
course
VBR920
year
type
H2 - Master's Degree (Two Years)
subject
keywords
explosion deluge decision making CFD FLACS offshore
publication/series
LUTVDG/TVBB--5219--SE
report number
5219
ISSN
1402-3504
language
English
id
1688984
date added to LUP
2011-01-20 16:55:35
date last changed
2014-03-10 10:40:34
@misc{1688984,
  abstract     = {On offshore installations for oil- and gas exploration, fire-water deluge systems are often installed to mitigate the effect in case of fires. Recent research has shown that the deluge can also be used to mitigate explosion consequences by activating deluge on gas detection. The effect of deluge on the explosion risk is however very complex and could in some cases lead to increased explosion risk instead of risk reduction.

This thesis puts the problem of explosion risk management and deluge into a decision making context and investigates different aspects of relevance to the decision on if deluge should be used as explosion risk reduction measure or not. A framework has been derived on how to produce a decision support which reflects both the decision makers preferences and the scientific sound methods of calculating the explosion risk with and with-out deluge. The four most important features of the framework include a course decision analysis, the use of computational fluid dynamics to quantify the consequences, Monte Carlo analysis and the application of the NORSOK Z-013 standard. The framework also includes a cost- benefit analysis model and a model to estimate the time from start of leakage to efficiently activated deluge.

The framework was then tested practically by applying it in a case study of an installation in the North Sea. During this exercise, problems and opportunities of improving the framework became obvious. Based on this hindsight knowledge, the framework was improved. A recommendation for the case study object is also presented.},
  author       = {Nilsson, Rasmus},
  issn         = {1402-3504},
  keyword      = {explosion deluge decision making CFD FLACS offshore},
  language     = {eng},
  note         = {Student Paper},
  series       = {LUTVDG/TVBB--5219--SE},
  title        = {Deluge and gas explosion risk management: A decision support framework},
  year         = {2006},
}