IS 15656 : 2006 Hazard Identification and Risk Analysis - Code of Practice

1 SCOPE

This Code describes specific techniques to prevent humanand property losses in the operation and management ofprocess plant. The overall methodology presented in thisCode allows systematic identification of hazards as wellas quantification of the risks associated with the operationof process plants. Applied with due expertise and rigourthe prescribed methodology can help the user understandthe relative levels of hazards and risk potential in aninstallation. This aids the selection and prioritization ofnecessary strategies for accident prevention and limitingtheir consequences. Therefore, the Code can be used forimproving plant safety performance as well as to reducehuman and property losses. Risk analysis is a process thatconsists of a number of sequential steps as follows:

a) Hazard Identljication - Identifying sources ofprocess accidents involving release of hazardousmaterial in the atmosphere and the various ways(that is scenarios) they could occur.

b) Consequence Assessment - Estimating theprobable zone of impact of accidents as well as thescale and/or probability of damages with respect tohuman beings and plant equipment and otherstructures.

c) Accident Frequency Assessment - Computationof the average likelihood of accidents.

d) Risk Estimation - Combining accidentconsequence and frequency to obtain riskdistribution within and beyond a process plant.

This Code describes the essential nature of each of theabove sequence of steps and describes a variety oftechniques for identifying hazards and the quantificationof accident consequence and the frequency towards thefinal risk estimation.

The Quantitative Risk Analysis (QRA) is most applicableand provides meaningful results when a plant is built,operated and maintained as per design intent and goodengineering practices.