This paper describes an enhanced concept for determining the right time and place for maintenance works (in this case rehabilitation and renewal), within the scope of a risk-based maintenance strategy for trunk mains, including a technical and economic risk assessment. The risks considered include damage caused by pipe failure (main burst) like revenue loss, third party property damage as well as damage to intangible assets (loss of company reputation). The innovative part of this concept is the intelligent combination of a remaining-service-life prognosis for pipelines with structural load factor verification, technical condition assessments, geo-referenced analyses and detailed costing. This approach allows a very detailed risk assessment of several thousand pipe sections (high spatial resolution approach). The outcome based on this concept are the required maintenance items (what and where) and a catalogue of maintenance actions (how and when) including maintenance type and costs.

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