MAIN LINE FAILURE RESULTED FROM COMBINATION OF MINOR CAUSES

Stefano C. Chiovelli, David V. Darling, Alan G. Glover, David J. Horsley NOVA Corp. of Alberta Calgary Combined effects of a preexisting weld defect, settlement of adjacent branch piping, and less than critical line pressure caused the rupture and fire Jan. 8, 1992, on the Western Alberta main line. The line is operated by NOVA Corp. of Alberta's Alberta Gas Transmission Division, Calgary. The failure site is approximately 60 miles (100 km) north of Calgary.

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