Trigon-Sheehan is an engineering consulting firm that provides clients with quality engineering services for pipelines and related facilities, specializing in projects for the crude oil, refined products, natural gas and energy industries. The company was formed 20 years ago as Trigon Engineering. In 1997, Sheehan Pipeline Construction Company of Tulsa invested in the company and Trigon-Sheehan was formed. The company has steadily grown since 1981, and projects have included over 7,500 miles of pipelines, over 250,000 horsepower of natural gas compression and liquids pump stations, and over 1,000 miles of fiber optic backbone facilities throughout the United States.
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