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DEVELOPMENT OF INTERNAL (TRENCHLESS) REPAIR TECHNOLOGY FOR GAS TRANSMISSION PIPELINES* W. A. Bruce, D. D. Harwig, I. D. Harris and J. R. Gordon Edison Welding Institute Columbus, Ohio M. Sullivan and C. Neary Pacific Gas & Electric San Ramon, California ABSTRACT The most common cause for repair of gas transmission pipelines is external, corrosion-caused loss of wall thickness. To prevent an area of corrosion damage from causing a pipeline to rupture, the area containing the corrosion damage must be reinforced. The most commonly used method for repair of gas transmission pipelines is the installation of welded full-encirclement steel repair sleeves. * For presentation at Natural Gas Technologies II, GTI Conference & Exhibition, February 8-11, 2004, Phoenix, Arizona.