The 622,000 b/d Keystone oil pipeline is repaired and has approval to restart at a reduced pressure less than a week after spilling crude in North Dakota.
Pipeline operator South Bow is planning a "controlled restart" of the Keystone system today, provided weather cooperates, the company said. The repair and restart plans were approved by the Pipeline and Hazardous Materials Safety Administration (PHMSA), which issued a corrective action order (COA) to the Calgary-based midstream company on 11 April.
The pipeline is a major carrier of Canadian heavy crude destined for both the US midcontinent and the Gulf coast but was shut down on 8 April after spilling 3,500 bl near Kathryn, North Dakota. About 2,845 bl had been recovered by 12 April, according to PHMSA.
The COA indicates Keystone was operating at 1,251 pounds per square inch gauge (psig) at the time of failure, below the maximum allowed operating pressure of 1,440 psig for the pipeline. Flow rate at the time of failure was 17,844 bl per hour.
Keystone will be capped at 80pc of the pressure at the time of the failure, or 1,000 psig.
PHMSA noted five prior spills from Keystone occurring in 2016, 2017, 2019, 2020 and 2022 that saw releases of 400, 6,592, 4,515, 442 and 12,937 bl of crude, respectively, which "show a tendency or pattern in recent years of increasingly frequent incidents resulting in larger releases".
Prices on either side of the pipeline break narrowed ahed of Keystone's imminent return-to-service. Heavy sour Western Canadian Select (WCS) in Hardisty, Alberta, has narrowed by about 75¢/bl to a $9.10/bl discount to the May Nymex WTI calendar month average, so far, while the same assessment in the Houston, Texas, area has widened by nearly 30¢/bl to about a $2.40/bl discount to the May basis.
