HPCL CPM 3-PCP 5-Risk Anaylsis & Hazop Studies- PPT.pptx

# To rank risk we need a new tool the best tool

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To rank risk, we need a new tool. The best tool developed so far is the Hazard Identification Risk Assessment, or HIRA matrix.

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Risk = Hazard x Consequence
Unit 7 Event Tree Analysis Unit 7 Event Tree Analysis

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`Event Tree Concept 1. Event trees begin with an initiating event and works towards a final result. 2. Or Event tree is an analytical technique for identifying and evaluating the sequence of events or possible outcomes in a potential accident scenario following the occurrence of an initiating event. 3. This approach is inductive 4. The method provides information on how a failure can occur and the probability of occurrence. 5. Various safety systems are provided at LPG Plants & terminals 6. It depends upon whether the design safety systems work properly or malfunction when needed. 7. The safety systems provided can succeed or fail 8. In essence the event tree approach includes the effects of an initiating event followed by impact of safety systems.
Case Study / Example Of Event Tree Safety Function Success Probability

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`Event Tree Concept 1. Event trees begin with an initiating event and works towards a final result. 2. Or Event tree is an analytical technique for identifying and evaluating the sequence of events or possible outcomes in a potential accident scenario following the occurrence of an initiating event. 3. This approach is inductive 4. The method provides information on how a failure can occur and the probability of occurrence. 5. Various safety systems are provided at installations, at pipelines & terminals 6. It depends upon whether the design safety systems work properly or malfunction when needed. 7. The safety systems provided can succeed or fail 8. In essence the event tree approach includes the effects of an initiating event followed by impact of safety systems.
Event Tree Procedures 1. The event tree is written from left to right 2. The initiating event is written first in the center of the page on the left 3. A line is drawn from the initiating event to the first to the first safety function. 4. At this point the safety system can either succeed or fail 5. By convention a successful operation is drawn by a straight line upward 6. A failure is drawn down ward. 7. Horizontal lines are drawn from these two states to the next safety function. 8. If a safety system does not apply the horizontal line is continued thru the safety function without branching.

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Event Tree Steps 1. Identify an initiating event of interest 2. Identify the safety functions designed to deal with the initiating event 3. Construct the event tree 4. Describe the resulting accident event sequences 5. Typically there would be 4-5 safety functions in the design 6. Any one might fail or succeed including operator action in time 7. The course event will follow thus dictated by success / failure of instrumented safety systems and/or operator intervention .
• Fall '19
• Safety engineering, fault tree, Hazards

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