CoFs & LoFs: Pie Charts and Risk Weights

Ever wonder how the LOF and COF Contribution Pie Charts  are generated in InfoMaster?  If so, read on!

The percentages are calculated when InfoMaster sums the total COFs and LOFs in the risk report.

In the example above, the total of the COF1 column (Critical Facilities) was 3138. The total sum of the Consequences of Failure for all assets in the second column is 7809.  So the percentage that COF1 contributed to the total COF in the second column is 3138/7809 = 40%.  This is what you see in the pie chart.

All this calculation takes place after you add multipliers and exponents in the second step of the risk wizard.  So if I were to have added a multiplier of 2 to COF1, my total for this individual COF would have been 6276 (3138 *2).

The pie chart is simply telling you, based on your own scores, weights, and exponents, which COFs or LOFs are contributing to overall your total COFs, LOFs, and therefore risk score the most.  If I wanted my COF1 (Critical Facilities) column to account for less than 40%, I would go back and change my scores, weights, and exponents to lower its affect.

If you have set percentages that you want to each COF or LOF to contribute on a per pipe basis (for example you want Diameter to make up 25% of the total COF score), you can set up your Risk Weights like the example below:

In this example, the weights of the COFs being used add up to 100 (or 100%).  Since we want Pipe Diameter to make up 25% of the total COF score, we set the weight as 25.  We can set up similar weights for the rest of the COF used.  Just make sure that it equals out to 100 so that it easily converts to a percentage.

 

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