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Northwest Completes Three-Year WA Line Replacement Project

Williams' Northwest Pipeline completed its capacity replacement project in Washington state. Work began in 2003 on the project, which is now in service.

The capacity replacement project involved abandoning 268 miles of 26-inch diameter pipeline between Sumas and Washougal, WA, and the construction of approximately 80 miles of 36-inch diameter pipeline in four sections along the same pipeline corridor.

Northwest also modified five existing compressor stations to create an additional 10,760 net horsepower. The capacity replacement project has substantially replaced the approximately 360,000 Dth/d of capacity previously provided by the 26-inch pipeline.

The project was prompted by ruptures on the Northwest Pipeline system in May and December of 2003 (see Daily GPI, Dec. 23, 2003; Dec. 18, 2003; June 11,2003; May 5, 2003). There were no explosions or injuries. However, the federal Office of Pipeline Safety and the Pipeline Safety Division of the state Utilities and Transportation Commission ordered the company to test and repair defective segments of the pipeline, which was installed in 1956 (see Daily GPI, Aug. 1, 2005).

"This important project allows us to continue delivering reliable natural gas service to our customers throughout the Pacific Northwest. We're pleased to see it completed on time and on budget," said Phil Wright, president of Tulsa-based Williams' gas pipeline business.

Crews will be performing final clean up duties in the area with the majority of restoration work targeted for completion by the end of December.

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