All risk cannot be quantified, i.e. for some processes it can not be addressed by consequence analysis. As a conservative approach, these risks needs to be considered separately by means of HIRA.
What is HIRA?
HIRA is known as HAZARDS IDENTIFICATION AND RISK ASSESSMENT, it is a tool wherein hazards are identified at various stages, risk assessment is carried out based on the engineering judgments and proposed recommendations are suggested, if existing mitigation measures are not efficient/adequate to mitigate the risk.
In HIRA, we consider major manual activities carried out by plant personnel as well as by contract labors.
We study the process carried out in detail, identify the hazards associated in each operation of equipments as well as processes, assesses its impact on human being and surrounding equipment/environment, rank the risk posed by that hazard, then we identify the existing mitigation measures in the industry and finally we propose extra important remedial actions/measures, if the available mitigation measures are not adequate to mitigate the risk so as to minimize the risk to tolerable level.
To carry out HIRA study we propose the matrix so called a “Risk Matrix” which should be referred while ranking the Risk Class to a particular identified hazard..