CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Burgess, M.M.; Nixon, J.F.; and Lawrence, D.E.
Date : 1998
Title : Seasonal pipe movement in permafrost terrain, KP study site, Norman Wells Pipeline.
Publication : Permafrost, Seventh International Conference, June 23-27, Yellowknife, Canada. Edited by: A.G. Lewkowicz and M. Allard. Université Laval, Centre d'études nordiques, Collection Nordicana.
Issue : 57:
Page(s) : 95-100.
Abstract
The Norman Wells pipeline is the first completely buried oil pipeline in Canada in permafrost terrain. From start-up in 1985 until late 1993, the oil was chilled year-round for entry into the line at -2 o C. A seasonal freeze-thaw chilling cycle has since been in effect. A 100 m long site was established in 1994 to observe the interaction between the alternating cold and warm pipe and permafrost soils. Successive pipe elevation surveys have shown that the pipe undergoes seasonal heave and settlement of up to 22 cm. Net movement of up to 17 cm has occurred over three years, with the north end heaving, while the central and southern end settle. Pipe elevation surveys compare well to elevation data derived from Geopig runs and provide independent support to the internal geometry monitoring tool. Incremental pipe bending strains are low, less than 0.05%, and well within design limits.
Bibliography of Canadian Geomorphology