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Papers by Samith Rathnayaka

Research paper thumbnail of Accident modeling and risk assessment framework for safety critical decision-making: application to deepwater drilling operation

Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 2013

Rising global energy demand is encouraging oil companies to invest in deepwater drilling. However... more Rising global energy demand is encouraging oil companies to invest in deepwater drilling. However, there are numerous engineering and safety challenges involved in this activity. The BP Deepwater Horizon accident (Macondo well blowout) has raised serious concerns about the safety of deepwater drilling. The major reasons for such a catastrophic blowout event are the lack of continuous assessment of risk and the lack of risk-based decision making to take timely and adequate preventive actions. The present work proposes an accident modeling and risk assessment framework based on accident precursors (early warnings). This framework uses the system hazard identification, prediction and prevention methodology to model the unwanted situation. The proposed risk assessment framework generates results that can be used to: (1) analyze the dynamic performance of safety barriers, (2) analyze the probability of occurrence of different severity levels, (3) analyze the dynamic risk profile of diffe...

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Research paper thumbnail of Multiphase Hydrate Induction Experiment in a Subsea Pipeline

Volume 10: Petroleum Technology, 2015

Formation of hydrates is one of the many challenges faced in the offshore oil and gas industry. I... more Formation of hydrates is one of the many challenges faced in the offshore oil and gas industry. It may result in blockage of subsea pipelines and equipment, which may result in flow line rupture and process accident. Although extensive experiment study is conducted to better understand the nucleation of hydrates and their slug flow behavior in gas-water/oil systems. However, there is limited understanding regarding the effects of multiphase fluid dynamics and geometric scales on the formation/growth of hydrates in subsea pipelines. In this paper a multiphase lab scale flow loop set-up is proposed to study the effects of pipe diameter, wall roughness, solid particles and hydrodynamic properties. The multiphase development length of a pipe for varying geometric and flow parameters is also analyzed considering three phase mixture properties. This study will help in identifying the accurate development length for gas/liquid/solid multiphase flow.Copyright © 2015 by ASME

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Research paper thumbnail of Probabilistic estimation of hydrate formation

Journal of Petroleum Science and Engineering, 2015

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Research paper thumbnail of Risk-based process plant design considering inherent safety

Safety Science, 2014

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Research paper thumbnail of SHIPP methodology: Predictive accident modeling approach. Part I: Methodology and model description

Process Safety and Environmental Protection, 2011

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Research paper thumbnail of Safety challenges in harsh environments: Lessons learned

Process Safety Progress, 2014

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Research paper thumbnail of Accident modeling approach for safety assessment in an LNG processing facility

Journal of Loss Prevention in the Process Industries, 2012

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Research paper thumbnail of Methods and Models in Process Safety and Risk Management: Past, Present and Future

Process Safety and Environmental Protection, 2015

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Research paper thumbnail of System hazard identification prediction prevention (SHIPP) methodology predictive accident modeling approach

A process accident occurs as a result of a sequence of events initiated by deviation in the proce... more A process accident occurs as a result of a sequence of events initiated by deviation in the process parameters and/or failure or malfunctioning of one or more components. Many process accidents are controlled and mitigated before they escalate to major events. Unfortunately some do go on to produce catastrophic consequence s. As the size and complexity of processing facilities increase, the potential risk posed by accidents is increasing. Operational safety could be improved by giving emphasis to the prevention of incidents, rather than relying on control and mitigative measures. This method is referred to as an "inherently safer approach ". To prevent major, though infrequent, event occurrence, it is important to consider accident precursors (symptoms of hazards) such as operational deviations, mishaps, and near misses, in order to prevent abnormal events at source rather than controlling or mitigating them. -- The objective of this research is to present a novel methodol...

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Research paper thumbnail of Accident modeling and risk assessment framework for safety critical decision-making: application to deepwater drilling operation

Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 2013

Rising global energy demand is encouraging oil companies to invest in deepwater drilling. However... more Rising global energy demand is encouraging oil companies to invest in deepwater drilling. However, there are numerous engineering and safety challenges involved in this activity. The BP Deepwater Horizon accident (Macondo well blowout) has raised serious concerns about the safety of deepwater drilling. The major reasons for such a catastrophic blowout event are the lack of continuous assessment of risk and the lack of risk-based decision making to take timely and adequate preventive actions. The present work proposes an accident modeling and risk assessment framework based on accident precursors (early warnings). This framework uses the system hazard identification, prediction and prevention methodology to model the unwanted situation. The proposed risk assessment framework generates results that can be used to: (1) analyze the dynamic performance of safety barriers, (2) analyze the probability of occurrence of different severity levels, (3) analyze the dynamic risk profile of diffe...

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Research paper thumbnail of Multiphase Hydrate Induction Experiment in a Subsea Pipeline

Volume 10: Petroleum Technology, 2015

Formation of hydrates is one of the many challenges faced in the offshore oil and gas industry. I... more Formation of hydrates is one of the many challenges faced in the offshore oil and gas industry. It may result in blockage of subsea pipelines and equipment, which may result in flow line rupture and process accident. Although extensive experiment study is conducted to better understand the nucleation of hydrates and their slug flow behavior in gas-water/oil systems. However, there is limited understanding regarding the effects of multiphase fluid dynamics and geometric scales on the formation/growth of hydrates in subsea pipelines. In this paper a multiphase lab scale flow loop set-up is proposed to study the effects of pipe diameter, wall roughness, solid particles and hydrodynamic properties. The multiphase development length of a pipe for varying geometric and flow parameters is also analyzed considering three phase mixture properties. This study will help in identifying the accurate development length for gas/liquid/solid multiphase flow.Copyright © 2015 by ASME

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Research paper thumbnail of Probabilistic estimation of hydrate formation

Journal of Petroleum Science and Engineering, 2015

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Research paper thumbnail of Risk-based process plant design considering inherent safety

Safety Science, 2014

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Research paper thumbnail of SHIPP methodology: Predictive accident modeling approach. Part I: Methodology and model description

Process Safety and Environmental Protection, 2011

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Research paper thumbnail of Safety challenges in harsh environments: Lessons learned

Process Safety Progress, 2014

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Research paper thumbnail of Accident modeling approach for safety assessment in an LNG processing facility

Journal of Loss Prevention in the Process Industries, 2012

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Research paper thumbnail of Methods and Models in Process Safety and Risk Management: Past, Present and Future

Process Safety and Environmental Protection, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of System hazard identification prediction prevention (SHIPP) methodology predictive accident modeling approach

A process accident occurs as a result of a sequence of events initiated by deviation in the proce... more A process accident occurs as a result of a sequence of events initiated by deviation in the process parameters and/or failure or malfunctioning of one or more components. Many process accidents are controlled and mitigated before they escalate to major events. Unfortunately some do go on to produce catastrophic consequence s. As the size and complexity of processing facilities increase, the potential risk posed by accidents is increasing. Operational safety could be improved by giving emphasis to the prevention of incidents, rather than relying on control and mitigative measures. This method is referred to as an "inherently safer approach ". To prevent major, though infrequent, event occurrence, it is important to consider accident precursors (symptoms of hazards) such as operational deviations, mishaps, and near misses, in order to prevent abnormal events at source rather than controlling or mitigating them. -- The objective of this research is to present a novel methodol...

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