May 2016, Vol. 243, No. 5

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Possible Flaw in Weld Coating Cited in PA Pipeline Incident

Investigators have found evidence of corrosion on a natural gas pipeline that exploded in a massive fireball in Pennsylvania last week, scorching trees a quarter-mile away, damaging homes and burning a fleeing homeowner, the federal pipeline safety agency said Wednesday. The cause of Friday’s blast remains unknown, but the corrosion indicates a “possible flaw” in the coating material applied to a pair of welded joints, one at the point of failure and another excavated after the explosion, the Pipeline and Hazardous Materials Safety Administration said in a corrective order issued to thepipeline operator. Houston-based Spectra Energy Corp. said a 2012 pipeline inspection d

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