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The temperature difference of minus 70 degrees F and 145 degree oil filled pipe meant that a section of pipe would expand in length by 18 inches. When the temperature changes the pipe has to go somehere so the zigzag converts linear expansion into a sideways movement. Extreme zigzags were added where it crosses the Denali fault area to compensate for earthquake movement. The zigzag added 11 miles of pipeline to the project.

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Q: Why does the Alaskan pipeline zigzag?
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