Bowtie model

This section presents three Logical (Bowtie) models developed for Contact with electricity - high voltage cables , Contact with electricity- electrical work and Contact with electricity - tool . It is based on electrical accidents which have occurred in the Netherlands but also and on information about safety rules concerning work with electricity published by NIOSH (1995, 2002). 

The bowtie model, see Visser (1998) are used to explore barriers both to avoid undesirable events and to reduce consequences. Thus the bowtie model could aid in increasing resilience by exploring barriers to be used to foresee and avoid as defense in front and barriers to be used to cope and recover as defense in rear. 

This model is wholly compatible with the Bowtie model of the accident process, leading from exposure to hazards, through a central loss of control event to accident consequences Figure 2.7.3). This model links the barriers, preventing the accident process from propagating, which may be hardware barriers or behavioural/procedural barriers, to the management system needed to put them in place and keep them functioning. 

Platypus models the left hand or fault-tree side of a bowtie model for process safety by using a Bayesian Belief Net (BBN). That is to say, it calculates the frequency of occurrence of leaks of arbitrary size in process equipment. A leak or Loss of Containment (LoC) event does not necessarily lead to a catastrophe but in some cases leads a loss of containment can have severe consequences ranging from accidents or catastrophes. Most of the BBN-based method was develop in 2011 and 2012. The background information for the model can be found... 

The Dutch government has chosen the quantitative risk approach in order to determine the most important paths of occupational accidents and optimize the risk reduction e fforts. It has embarked the Workgroup Occupational Risk Model (WORM) project, as presented by Ale et al. (2008). Major part of the WORM project is the quantification of occupational risk, according to the bowtie methodology developed within the project and presented by Papazoglou Ale (2007). 

Damen M., Aneziris, O., 2008 Technical report on the modelling of Bowties 12 Contact with electricity, WORM Metamorphosis Report. 

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