A method to determine safe and cost-effective intervals for conducting future intelligent pig inspections has been developed and validated with pipeline details and inspection data from a sample of 20 pipelines. These lines cover a representative range of age, diameter, number of external corrosion features, and corrosion growth rates. After validation, the method was applied to the entire piggable network operated by SNAM Rete Gas SpA, Milan, an 18,000-mile gas pipeline network in Italy. Until 1999, pigging had been conducted only periodically. SNAM Rete Gas is the new brand name for the Eni Group Co. formed to acquire, own, and operate (as of July 2001) all natural gas transportation service assets previously owned by SNAM SpA. This merger anticipates the coming into force of the new Italian regulation that envisions separation of natural gas transmission activities from the other activities of the gas sector. The majority of the piggable pipeline network has been inspected (using intelligent pigs) at least once and many of the pipelines in the network have been inspected twice. Consequently, a significant knowledge of the condition of the pipeline network has been accumulated.
Method to determine ILI intervals proven on Italian system
Eine Methode zur Vorhersage der Inspektionsintervalle für Pipelines
Oil and Gas Journal ; 100 , 28 ; 58-61
2002
4 Seiten, 6 Bilder, 2 Tabellen
Article (Journal)
English
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