Читать книгу Root Cause Failure Analysis - Trinath Sahoo - Страница 66

Although the nature of the undesired event may be quite different, fault tree analysis has the same procedure for any types of undesired event. To do a comprehensive fault tree analysis, simply follow the process below:

1 Define and identify the fault condition (hazard) as precisely as possible based on the aspects such as the amount, duration, and related impacts.

2 Using technical skills and existing facility details to list and decide all the possible reasons for the failure occurrence.

3 Break down the tree from the top level according to the relationship between different components until you work down to the potential root cause. The structure of your fault tree analysis diagram should be based on the top, middle (subsystems), and the bottom (basic events, component failures) levels.

4 If your analysis involves the quantitative part, evaluate the probability of occurrence for each of the components and calculate the statistical probabilities for the whole tree.

5 Double‐check your overall fault tree analysis diagram and implement modifications to the process if necessary.

6 Collect data, evaluate your results in full details by using risk management, qualitative, and quantitative analysis to improve your system.