Gasunie operates nearly 11.500 kilometres of pipelines in the Netherlands. The amount of pipelines constructed in the 1960's and still in operation is 1600 km. These pipelines were fabricated from steels with the requirements of those days. They do not necessary fulfil present day toughness requirements and as a result thereof could form a certain safety risk. In this paper the methodology will be described how a selected population of these 'old' pipelines have been analysed by a risk assessment approach. Although the risk assessment team has been in fortunate circumstances to use a digital database with material information, such as steel grade, Charpy V-values, diameter, depth of cover etceteras, the distribution of old pipes with low toughness over the construction areas was unknown. First the selected population of old pipelines have been ranked by a generic risk assessment approach. Secondly, after approval of this approach by the Safety department, the highest ranked pipelines have been further analysed with a site-specific risk assessment. It could be proven by this analyses that no further rehabilitation or repair were necessary for the old pipelines with low toughness, because the risk assessment results did fulfil the individual and societal risk criteria which are applicable in the Netherlands.
The way to handle older pipelines with low toughness - a risk assessment methodology gives the answers
Die Art der Behandlung älterer Pipelines mit niedriger Zähigkeit - Eine Risikoanalysenmethode liefert die Antwort
2000
13 Seiten, 12 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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