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Learn about the systematic methodology of QRA, including hazard identification, consequence & frequency analysis, risk estimation & evaluation, and risk management. Understand the importance of CIMAH & EQA regulations in safety reports. Explore methods like HAZID, fault-tree analysis, and Probit Analysis. Enhance your understanding of identifying hazards, assessing damage, and proposing mitigating measures.
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What is QRA • Systematic methodology to assess risks associated any installation • Taking into consideration all forms of hazards • Uses design information and historical data to estimate frequency of failure • Uses modelling software to assess consequence • Where/when is QRA needed • CIMAH 1989 – part of CIMAH safety report • EQA 1985 – a section under EIA
Definition Risk = Severity x Likelihood • Extent of Damage • Fatality • Injuries • Losses • Analysis based on design and modeling equations • Likelihood of event • Based of failure frequency of process components • Analysis based on manufacturer’s and historical data
Methodology Hazard Identification Consequence Analysis Frequency Analysis Risk Estimation and Evaluation Risk Management
Hazard Identification • Purpose: to identify plausible hazard conditions • Methods • Check-list, Preliminary Hazard Review, HAZID, HAZOP etc. • Unstructured brainstorming? Further Details
Frequency Analysis • Sometimes referred to as Hazard Analysis • Purpose: To estimate the likelihood for a hazard scenario to occur • Methods • Event-Tree Analysis • Fault-Tree Analysis Further Details
Consequence Analysis • Purpose: To assess the extent of damage • Typical Hazard • Toxic Release, Fire and Explosion • Modelling of hazard scenario • Toxic Release: Source (Release) Model, Dispersion • Fire and explosion: Source Model, Fire and Explosion, Heat Dispersion • Fatality Assessment: Probit Analysis • Nonfatal Consequence: Skin-burn, Property damage Further Details
Risk Estimation and Evaluation • Purpose: To assess Risk and Make Safety Judgment • Methods • Individual Risk: IRPA, LSIR • Societal Risk • Tolerability Criteria Further Details
Risk Management • Propose: to propose mitigating measure to reduce the potential impact of the hazard and possibly reduce the risk level • Method • Safe Work Procedure at every project stages • Emergency Response Management • Emergency Response Procedure