ENR: San Bruno Natural Gas Pipeline Explosion May Have Been Caused By Defective Or Improper Materials

Although more analysis is forthcoming, investigations into the causation of the San Bruno gas pipeline explosion so far indicate improper materials may have been a contributing factor:

The group headed by the National Transportation Safety Board investigating the Sept. 9 natural gas pipeline rupture and explosion that killed eight people in San Bruno, Calif., released an interim report that ruled out outside corrosion and damage caused by a third party as the cause for the blast, but found that part of the pipe near the rupture was constructed with seam-welded pipe, which owner Pacific Gas & Electric reported as seamless.

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Image courtesy Pipeline Journal