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Internal Repair of Pipelines – Project Review Meeting NETL Project No. NT 41633 May 12, 2005 – Morgantown, WV Bill Bruce and Nancy Porter Edison Welding Institute Introduction – 1 • External, corrosion-caused loss of wall thickness is the most common cause of repair for gas transmission pipelines • As pipelines become older, more repairs are required • Internal (i.e., trenchless) repair methods are an attractive alternative to conventional repair methods since the need to excavate the pipeline is precluded – Particularly true for pipelines in environmentally sensitive and highly populated areas