July 2011, Vol. 238 No. 7

Features

Investigation Follows Bison Blowout

After TransCanada’s Bison pipeline experienced an as-yet-unexplained rupture in Wyoming July 20, an investigation is under way but has not yet uncovered the cause of the accident. The rupture occurred in remote country and did not result in any injuries or property damage aside from the pipeline itself. July 27, TransCanada said the rupture was unrelated to operating pressure and caused by a mechanical event. The operating pressure question was raised due to the fact that Bison is licensed to operate at a higher-than-standard 80% MAOP and is therefore subject to stricter safety regulations. David Dodson of TransCanada estimated that a 50-foot chunk of pipe was affected,

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