HAZOP: a risk analysis method - Principle

The HAZOP (Hazard and operability studies) method consists in breaking down a given system into sub-assemblies called "nodes", and then, using specific keywords or guide words (see [SE 4 030] ), varying the parameters of the system studied in relation to its set points called "process intentions". The deviations thus obtained are examined by a dedicated multi-disciplinary team (see [SE 4 032] ) to deduce their potential consequences for the system as a whole, and to determine those leading to potential risks for the safety of people, property and the environment. The working group then examines and defines recommended actions to eliminate the cause as a matter of priority, or to mitigate or even eliminate the consequences. The analysis of deviations is recorded in tabular form, providing an indispensable basis for the subsequent implementation of the actions recommended by the working group.

In this article, we'll look at system analysis, parameter determination, keyword selection and deviation studies.

After presenting the HAZOP method and its fields of application in the article [SE 4 030] , the principle is given here, along with the various points to be taken into account.

In [SE 4 032] , we will see how this method can be applied. The bibliographical references cited here can be consulted in the document file [Doc. SE 4 033] .