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Risk analysis vs. HAZOP


Hazard and Operability Analysis (HAZOP)


The HAZOP method is well suited for evaluation of process related risks. The method involves a structured and systematic way to identify potential risks and ensure that appropriate safeguards are in place through the use of key words in well-defined parts of the process.


The analysis can be carried out in 5 steps:

1) Define the process

2) Define the type of hazards to be included

3) Subdivide the process and develop deviations

4) Conduct HAZOP reviews

5) Use the result for decision making


Risk analysis


A risk analysis is always initiated by defining the scope of the analysis. In the case of satisfying standard ISO 12100:2010 or ISO 13849-1:2008, this step consists of determining the limits of the machinery.


In a more general perspective this step involves specifying what type of hazards to include, by defining the consequences of concern and the physical limits for the analysis. It also includes defining assumptions regarding the status of equipment, operational personal and other factors. Following a standard can be very helpful since it give instructions on many potentially difficult questions that otherwise would have to be considered.


Logical steps:

1) Define the system

2) Define the type of hazards to be included

3) Subdivide the subject for analysis

4) Generate what-if questions

5) Respond to questions

 

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