Hazard And Hazard Analysis: Analysis And Techniques For Risk Analysis

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There are a lot of techniques for hazard analysis, but the most commonly used technique is Hazard and Operability Review (Hazop), Fault Tree Analysis and Event Tree analysis.The HAZOP technique can be defined as the application of a formal systematic critical examination of the process and engineering intentions of new or existing facilities to assess the hazard potential that arise from deviation in design specifications and the consequential effects on the facilities as a whole.The basic idea of hazop is to consider all possible ways that process and operational failures can occur. This technique is usually performed using a set of guidewords which is no/not, more or/less of, as well as, part of reverse, and other than. From these guidewords, scenario that may result in a hazard or an operational problem is identified. The consequences of the hazard and measures to reduce the frequency with which the hazard will occur are then discussed One of the advantage of hazop is it identifies potential hazards and their effects at every stage of the project life cycle. It also eliminates failures or reduce their risk levels at every stage of the project life cycle. Besides, it also helps the design team to decide on the need for an increase of redundancy and diversity. It also focuses on the sensitive areas of the system which, on failure could lead to potentially hazardous consequences and this highlights where effort can be most effectively applied to improve the system safety, reliability and availability. While, the advantage of hazop is, it is time consuming and requires a team of experienced people with various backgrounds relating to the process or system which may increase costs. It also difficult to schedule meetings in a way t... ... middle of paper ... ... a given initiating event. The advantage of ETA is, it can be used to analyse risk of possible consequences of an initiating event or failure. It also can be used to investigate the feasible outcome of an event and estimate relative probability of each outcome. Besides, is it is easy to draw once the sequence of events is established. ETA is also easy to understand and easy to compute probabilities. However,it may be difficult and time consuming to identify all consequences. Just like fault tree analysis, the event tree can become very large and complex. Therefore, based on the advantage and disadvantage of hazard analysis technique stated above, we decided to use Fault Tree Analysis (FTA). Moreover, it is more suitable and relevant with our topic. It is also convenient for us as a student, because for hazop analysis, it require a team of expert, while FTA doesn’t.

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