June 2011 Vol. 238 No. 6


HDD Instrumental In Bison Project

When TransCanada Corp. opened its new 305-mile, 30-inch Bison Pipeline between the Rockies and the Midwest earlier this year, horizontal directional drilling (HDD) played an important role in its completion. Environmental concerns, and not economics, drove the use of HDD technology for river, stream and road crossings in building the Bison Pipeline. The dramatic advantage is the reduction of surface disturbance, that owner/operator TransCanada emphasizes. Examples are abundant: Interstate Highway 90, a 500-foot bore that consumed eight working days and another four days for pre- and post-drilling, or mobilization work, according to Houston-based David Dodson, a TransCanada spok

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