Expected Frequencies of Occurrence, Release Processes and Relevant Accident Consequences

1 Expected Frequencies of Occurrence, Release Processes and Relevant Accident Consequences 

1 Expected Frequency of Pipeline Rupture and Conditional Probability for Ignition 

Only the total failure of the pipeline is considered. It is regarded as dominating aU leak sizes. 

This frequency can be derived from [81] where the rate for gas release is given as 5.8 X 10 per km and year. About 9 % of this value represent spontaneous total rupture. 

It is assumed for the accident consequence calculation that the relevant pipeline section has a length of 10 m. The expected frequency for a total failure in this section then is 

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