01 November 2013 20:09 [Source: ICIS news]
HOUSTON (ICIS)--Tesoro Logistics has been grant permission by the US government to restart its crude oil pipeline in North Dakota after completing corrective measures following a spill that led to a 29 September shutdown of the line, the US company announced on Friday.
As of Thursday, more than 4,500 of the estimated 20,000 bbl released have been recovered from the rural field northeast of Tioga, North Dakota, the company said on Friday.
“While final results are pending, the preliminary report indicates that the likely cause of the small diameter hole in the pipeline was from electrical discharge,” Tesoro said. “The source of the electrical current remains under investigation. According to the initial lab report, there were no signs of corrosion or other defects at the failure location.”
Tesoro is able to return the line to service after accepting a safety order issued by the US Department of Transportation’s Pipeline and Hazardous Materials Safety Administration (PHMSA), which requires the company to complete a number of short- and long-term improvements.
Tesoro must perform frequent aerial and ground inspections and install additional leak detection equipment, as well as update maps of the entire High Plains Pipeline System and evaluate the pipeline to identify further preventative measures to protect important water bodies.
Additionally, Tesoro was required to submit a restart plan, which was approved by the PHMSA prior to the return to service.
The failed pipe segment has been removed and sent to a lab for analysis. Meanwhile, new pipe has been installed and tested, and pressure and flow detection systems have been installed.
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