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Title: A new joint-industry project addressing the integrity management of SCC in gas transmission pipelines
Downloadable: Yes 
Catalog No.: 2257s
Date of Publication: Jun 1 2012 12:00AM
Price: $25.00 US
Authors: Dr A David Batte, Raymond R Fessler, Jim E Marr and Steve C Rapp
Abstract: IN 2006 a group of natural gas transmission pipeline operating companies in North America collaborated in a joint-industry project (JIP) to address the integrity management of SCC in high-consequence areas. The outcome of the work was a series of reports examining the occurrence of SCC extending over 40 years up to 2005, and developing experience-based guidance for conducting hydrostatic testing and excavations, for assessing the severity of discovered cracks and for establishing the interval before the next assessment. The outcome was published in ASME STP-PT-011 [1] and provided the basis for proposed revisions to ASME B31.8S. It also enabled the closer alignment of ASME B31.8S with the revisions to the CEPA Recommended practice for SCC.

Five years later, a slightly enlarged group of operators has revisited the current status of SCC threat management in North America. The operational experience relating to over 256,000km of gas transmission pipelines during the last five years has been compared with that seen up to 2005. The threat-management procedures and practices, including the application of hydrostatic testing, SCC direct assessment, and the latest-generations of crack- detection in-line inspection (ILI), have been examined, and benchmarks for good practice have been identified. The increasing application of SCC direct assessment and crack-detection ILI has focused attention on the prediction of failure pressures for discovered SCC; a protocol for gathering consistent data during post-ILI excavations has been developed, and the influence of flaw profile on predicted failure pressure has been explored.

This paper presents an overview of the JIP Phase II programme and summarizes some of the early results. It is intended that the outcomes of the individual tasks will be disseminated for the benefit of the wider industry, so that they can provide an informed basis for any proposed modifications and improvements to industry guidance and regulations.

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