The Government Accountability Office (GAO) issued a report on August 4, 2017, titled “Pipeline Safety – Additional Actions Could Improve Federal Use of Data on Pipeline Materials and Corrosion.” The 55 page Report, prepared in response to a Congressional mandate in the 2016 Pipeline Safety Act reauthorization, summarizes pipeline materials, training and corrosion prevention technologies for gas and liquid pipeline facilities and analyzes PHMSA use of corrosion and material data to inform its inspection priorities. The Report recommends that PHMSA review, document and validate the way in which it identifies the highest risk pipelines for inspection, but makes no significant new findings, and the recommendations are largely consistent with initiatives that PHMSA already has begun.
The Report notes initially that pipelines carrying hazardous liquids or gas have the lowest incident rate of other transportation modes. For oil and gas pipelines from 2010 to 2015, GAO’s assessment of PHMSA incident data attaches the highest single cause as corrosion (22%), followed by “equipment failure” (21%), “natural or outside force” (16%) and “excavation damage” (14%). PHMSA tracks causal data somewhat differently, however, grouping “equipment failure” and “material/weld failures” together in a single category, which is reported by operators to be the largest cause of significant incidents in the past 5 years. By comparison, the GAO Report links corrosion (22%) with “material, pipe or weld failure” (12%), although it is a very different failure mechanism from corrosion, to be the estimated cause of nearly one-third of all oil and gas significant incidents.