The rupture in ExxonMobil's Pegasus Pipeline, which spilled about 150,000 gallons of crude oil in Mayflower, Ark., was caused by manufacturing flaws in the pipe, according to a study by Hurst Metallurgical Research Laboratory. "Additional contributing factors include atypical pipe properties, such as extremely low impact toughness and elongation properties across the ... seam," the company said. Exxon continues to perform tests to determine all of the factors in the pipeline's failure, the company added.

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