More than a year ago an assessment of Enbridge’s 6B Michigan pipeline revealed corrosion on the line but as recently as this month the company was still negotiating with regulators for more time to fix the problem.
These facts were revealed this week in a Corrective Action Order issued by the U.S. Dept. of Transportation’s Pipeline and Hazardous Materials Safety Division.
That order noted that portions of the 286 mile long 6B pipeline are located in ecologically sensitive and populated areas and ordered Enbridge to evaluate the entire line for safety problems before resuming use of the pipeline.
Line 6B was last re-assessed for corrosion in June, 2009 with Ultrasonic Technology and prior to that in October, 2007 with Magnetic Flux Leakage technology. On July 15, 2010 Respondent notified PHMSA of an alternative remediation plan for metal loss anomalies found in this survey to consider pipe replacement instead of repair. Enbridge further notified PHMSA that the alternative remediation method would result in exceeding the allowable timeframe to complete remediation.