Trans Alaskan Pipeline

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3.0 Construction Intro
In the spring of 1970 the construction of the Trans Alaskan Pipeline (TAPS) was to begin. Several delays held the project from moving forward. Conservation concerns, Native objections, and legal and political issues were not resolved until March of 1974. TAPS consists of approximately 800 miles of 48” diameter pipe from Prudhoe Bay to Valdez. Oil companies, British Petroleum (BP) and Humble Oil, and ARCO incorporated to form Alyeska Pipeline Service Company. The independent corporation was in charge of constructing the massive project. The pipeline was constructed partially above ground, below ground, and spans several rivers and streams. Upon resolution of the delays, thousands of laborers, welders, and operators were …show more content…
The pipeline had been laid in a trench beneath the river in the late fall of 1975. Because it had been laid so late in the season, the trench fill material had solidified making it was impossible to fill the submerged trench containing the pipeline. Come spring snowmelt swelled the river and battered the section of pipe under the river bottom. In June, the torrent water dislodged the pipe freeing it from the soil and a 1,700-foot section of concrete-coated pipe swept away bobbing on the surface of the river. Repair work would disrupt with the migration of Arctic char, the Alaska Department of Fish and Game gave Alyeska 24 hours to repair the project. Upon completing planning and preparation, it took a sixth of a day to repairs to be made, a pipe welded and laid in the trench, and the trench to be filled in …show more content…
The pipeline crosses over the Denali, McGinnis Glacier and Donnelly Dome fault. The earthquakes on these faults are estimated to range in magnitude from 5.5-8.5. The design of TAPS was slightly serpentine in the event of an earthquake and some area the pipeline was laid upon tracks to slide horizontally. The pipeline has a deformation tolerance of twenty feet horizontally and five feet vertically. On November 3, 2002, the pipeline withstood an earthquake of magnitude 7.9 that was along the Denali Fault in Alaska, the focal point was about 50 miles west of the pipeline. The ground displacement was estimated 18 feet horizontally and 2.5 feet vertically. TAPS was shut down and inspected, but the pipeline suffered no damage from the earthquake
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