A forensic metallurgical report of Exxon Mobil’s Pegasus Pipeline has been made public. The 243-page report by the Hurst Metallurgical Research Laboratory was commissioned by the oil company and details how manufacturing defects and other stresses during the pipeline’s service contributed to a 22-foot long rupture.
The report also notes that the pipeline had undergone some constraint since it was manufactured in the late 1940’s by a company in Youngstown, Ohio. The report cites residual stresses which may have contributed to “hook cracks” along the welding seam of the pipeline.
The March 29th pipeline break in Mayflower caused the evacuation of 22 homes when more than 200,000 gallons of oil spilled into the area.