Method to determine ILI intervals proven on Italian system

Based on a presentation to the Congreso Internacional de Ductos (Comité Interorganismos de Ductos de Petróleos Mexicanos), Mérida, Yucatán, Nov. 14 -16, 2001.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 meth od 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, piggi...

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