Example of a quantified bow tie
Bow tie: a risk quantification method

To illustrate the quantified bow-tie methodology, a simplified case is studied with the dreaded event "rupture of an unloading arm of a liquefied gas wagon". The assumptions are as follows:

• liquefied gas is not unloaded in a closed enclosure;

• the unloading station is located in an area that could potentially be affected by domino effects (explosion on a neighboring unit).

This case study is intended to illustrate the various stages of the method:

• the creation of the fault tree, which enables an analysis of the minimum cuts in the tree and an assessment of the frequency of occurrence of the feared event;

• the creation of an event tree, highlighting all the...