Nov. 30 (UPI) — Mechanical damage from development of a bit of the Keystone pipeline in 2008 in South Dakota most probably ended in the most recent free up, a federal record discovered.
TransCanada closed down a lot of the two,687-mile community in North America in mid-November after reporting a free up of about five,000 barrels of oil in rural South Dakota. The corporate mentioned it recorded a drop in force early at the morning of Nov. 16 and brought on the shut-down procedure.
The federal Pipeline and Hazardous Materials Safety Administration mentioned in a corrective motion realize to TransCanada the discharge was once most probably the results of damage from when the segment of the pipeline in South Dakota was once at the beginning put in.
“Preliminary information indicates the failure may have been caused by mechanical damage to the pipeline and coating associated with a weight installed on the pipeline in 2008,” the record learn. “Weights are placed on the pipeline in areas where water could potentially result in buoyancy concerns.”
The corporate up to now mentioned there is been no water contamination and the discharge posed no instant chance to public well being. As of Sunday, that newest date for which it supplied an replace, the corporate mentioned it is recovered 1,065 barrels of what was once spilled.
The federal order calls on TransCanada to stay a small segment of its Keystone pipeline between pump stations in South Dakota closed as endured operations “would be hazardous to life, property, and the environment without immediate corrective actions.”
The corporate mentioned Tuesday, alternatively, restore and restart plan was once licensed by the PHMSA and not using a objections and Keystone resumed partial operations at diminished force. The executive added, in the meantime, that additional evaluate ended in an “unconfirmed lower spill estimate.”
The PHMSA added that it awarded a different allow to TransCanada to operation Keystone at a force stage that was once about 80 p.c of the metal pipeline’s minimal yield energy, which was once about eight p.c upper than the standard running force for hazardous liquid pipelines. That allow, issued about 10 years in the past, contained greater than 50 other stipulations associated with protection and inspections.
About 400 barrels had been launched from the Keystone community final yr. Federal investigators mentioned that was once from a “weld anomaly” at the pipeline and oil were leaking from the pipeline at a fee of 2 drops in step with minute for an undetermined duration of time.