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Title: Managing External Corrosion Direct Assessment Data
Author: Ralph Barbakoff
Source: American Gas Association 2004
Year Published: 2004
Abstract: Peoples Energy Corporation subsidiaries Peoples Gas and North Shore Gas operate 174 miles of transmission line as part of its gas transmission system. Peoples Gas system includes 79 miles of 24, 36 and 42 inch transmission line within the city of Chicago. North Shore Gas operates 16 to 30 inch gas transmission line in part of Lake County, Northeastern Illinois. The pipe installed predominantly since the late 1950s up to the early 1980s is coated with coal tar enamel coating. Pipe installed after mid 1980 is coated with fusion bonded epoxy coating. The girth weld coating is coal tar based hot wrap. Peoples Gas Transmission Line in the city of Chicago is designed to Class 4 specifications. North Shore Gas Transmission Lines are designed to Class 3 specifications. Both service territories are considered a High Consequence Area (HCA) per the Pipeline Integrity Final Rule issued in December 2003.

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