Notes
Slide Show
Outline
1
Trans-Alaska Pipeline
  • Brandi Backus
  • Derek Stathis
  • Zach Smith
2
Quick Facts
  • Oil was discovered on the North Slope in 1968
  • Pipeline travels from Prudhoe Bay to Valdez
  • Took three years to construct
  • Cost approximately 8 billion dollars.
  • 800 miles long
3
Regional Geology
  • Five Main Regions:
    • North  Slope
    • Brooks Range
    • Interior
    • Alaska Range
    • Chugach Range
4
Problems Encountered
  • Permafrost


  • Ground tremors, earthquakes


  • Game and River Crossings
5
Permafrost
  • Permafrost is any rock or soil material that has remained below 32° F continuously for two or more years.
  • Problems
    • Frost Heaving
    • Frost Jacking
    • Thaw Settlement
6
Solutions
  • Four main design modes:
    • Aboveground (52.5%)
    • Belowground Conventional (47%)
    • Special burial non-refrigerated
    • Special burial refrigerated
7
Seismic Activity
  • Pipeline crosses the Denali Fault south of Delta Junction


  • Pipeline was constructed in a zig-zag formation to minimize expansion.
8
 
9
Game and River Crossings
  • 800 stream and river crossings


  • Caribou game trails


  • Maintaining revegetation laws
10
Solution
  • Raised/buried crossings


  • Bridges


  • Gate Valves


  • Implanted cold-resistant grasses


11
Conclusion
  • $8 billion in a  3 year period
  • Spans 800 miles over 5 regions
  • Overcame engineering problems such as:
    • Permafrost
    • Seismic activity
    • Environmental impacts