Gas Pipeline Fitness-for-Service Investigation

by Frank A. Dauby, Pacific Gas & Electric Co, San Francisco, United States,
Chih-Hung Lee, Pacific Gas & Electric Co, San Francisco, United States,
Gary M. Vollbrecht, Pacific Gas & Electric Co, San Francisco, United States,



Document Type: Proceeding Paper

Part of: Pipeline Infrastructure II

Abstract: A delta reclamation district's plan to add significant fill on their levee caused great concern for the integrity of a critical PG&E 22-inch (559 mm) gas transmission line which crosses this geologically unstable area. Initially a conventional linear elastic analysis was performed, yielding results significantly above the elastic limit for steel at several locations. Considering the limits of current stress-based codes and the settlement controlled loading conditions, a decision was made to perform a state-of-the-art fitness-for-service investigation from a strain-based perspective. This paper describes the development and implementation of that investigation process, utilizing the latest technology in pipeline inspection and structural analysis.

Subject Headings: Gas pipelines | Elastic analysis | Linear analysis | Steel pipes | Inspection | Fills | Levees and dikes

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