Safety Moments are short stories or anecdotes that illustrate some aspect of personal or process safety. Generally they feature a near miss or foolish event that had the potential to be much worse than it was. They can be used to start a meeting or a task assignment.
Risk can be analyzed in one of two basic ways: inductively or deductively, that is either bottom-up or top-down.
In a deductive analysis a top-level system failure is postulated. The analyst then works backwards to deduce what combinations of events could have occurred for the system failure to have taken place (a detective solving a crime is thinking deductively). Fault tree analysis, the topic discussed in this article, is deductive.
Siting and Layout: The words ‘siting’ and ‘layout’ are often used interchangeably, but, strictly speaking, they have different meanings. Siting is concerned with the location of a facility. For example, if a company is planning on building a new chemical plant its management may consider the relative merits of sites in Texas, Mexico or China. Layout, on the other hand, is to do with the locations of equipment, piping and buildings at the selected site and how they connect with one another.