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  Title The use of hydrotesting and EMT ILI technology for the integrity management of SCC in gas pipelines
  Author(s) Pedro M Hryciuk, Eduardo Carzoglio, Jose A Minellono, Leonardo Martinetto, Pedro M Guillen, and Joerg Grillenberger  
  Abstract THIS PAPER DESCRIBES the activities and stages completed as part of the integrity-management programme for SCC in Transportadora de Gas del Norte‚Äôs (TGN- Argentina) natural gas system which started in 2000. This document focuses in a pipeline section of the system, which suffered an in-service failure in 2002 due to high-pH SCC.

This event triggered a series of activities, whose results are detailed in this paper. These activities involved soil analysis to determine the susceptibility of the pipeline system to develop SCC. For susceptible sections, the programme included hydrostatic testing to levels of 100% and 110% of SMYS followed by replacement of degraded coating.

The paper also details the experience in the use of new in-line inspection (ILI) tools with high-resolution EMAT-C technology. The capability of the EMAT-C tool to detect and size SCC defects, and the discrimination between SCC colonies that have been recoated and those that may still be active due to degraded coating, is discussed. Finally, the severity of SCC cracks detected by ILI is assessed using API 579 methodology, and the feasibility of using this assessment results to determine the critical SCC defect sizes for detection by ILI tools is analysed.

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