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Process Safety

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Submitted By sidcsb
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Risk prediction in the chemical industries can be presented in a way it allows easy judgemental of the acceptability of risks. This helps to reduce hazards in chemical process plant operations. Risk can be defined as the likelihood of an accident or unwanted event occurring at a particular period of time. Hazard can be a situation that can cause damage or injury. As it is known it is not possible to have ZERO risk in any operation. So it is highly important risk are identified, controlled if possible and therefore reduced.
Risk Assessment is defined as the process of examining the chances of a hazard in a workplace. For example the hazards in a flare gas recovery system can be analysed for possible hazards to workers and the public. The stages of risk assessment include:

* Identification of the hazard which can be based on past events. There are also tools like HAZOP, FMEA, SWIFT etc to determine any potential hazard. * Next is the frequency analysis which gives an estimate of how likely an accident can occur. In the case of a flare gas recovery system, it may be how likely is it to have the release of gas into the flare header due to equipment failure. Fault tree analysis and even tree analysis are mostly used for this estimation. They are both use to determine the probability and frequency of an incident (hazard). The results from these are used to analysis the acceptability of a particular chemical plant activity. * After frequency analysis is the consequences analysis. This look at the effect of any accident to workers, equipment, environment and the public. The risks of an accident can be expressed in two forms namely individual risk and societal risks. * The risks identified are now analysed for acceptability and tolerability. * If it is required risk reduction measure takes place to make the risks acceptable. * Final stage is the

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