PERMAFROST PIPELINING - 1: Northern Canadian pipeline deals with effects of soil movement

The entry of hypermarts into the US gasoline retail business shifted into high gear in 2000 and will continue its pace in the next decade.The line moves crude oil from Norman Wells, NWT, to Zama, Alta., and its route follows a portion of the Mackenzie River Valley in the Northwest Territories.This route runs through discontinuous permafrost that can interact with the pipeline through frost heave, slope movement, and thaw settlement that can produce extreme structural stresses in the pipe wall.Given the proper conditions, these stresses may localize and the pipeline will deform plastically, causing pipe wall wrinkling.This first article in a series of two on the effects of permafrost revie...

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