# SOUTH BOW INFRASTRUCTURE OPERATIONS INC. — Hazardous liquid — incident on 2025-04-08

- **operation:** document
- **citation:** PHMSA Report 20250112
- **title:** SOUTH BOW INFRASTRUCTURE OPERATIONS INC. — Hazardous liquid — incident on 2025-04-08
- **source type:** incident
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** 2025-05-07
- **effective on:** 2025-04-08
- **summary:** Hazardous liquid incident in KATHRYN, RANSOM County, ND. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 3500 CRUDE OIL released, $3,938,821 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings. PHMSA trend classification: significant incident, not serious.
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**body:**

Hazardous liquid incident in KATHRYN, RANSOM County, ND. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 3500 CRUDE OIL released, $3,938,821 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20250112.

Operator ID: 32334.

Reported incident date: 4/8/2025 7:42.

Location detail: 171

Cause detail: ORIGINAL MANUFACTURING-RELATED (NOT GIRTH WELD OR OTHER WELDS FORMED IN THE FIELD)

Cause detail: APRIL 8, AT APPROXIMATELY 07:42 AM CENTRAL TIME, THE CONTROL CENTER RECEIVED A LEAK DETECTION ALARM INDICATING A RELEASE AND IMMEDIATELY BEGAN THE ISOLATION PROCESS. AS WELL, LOCAL TECHNICIANS WERE NEAR THE RELEASE LOCATION STARTING MAINTENANCE WORK AND CONFIRMED LOSS OF CONTAINMENT. THE LOCAL TECHNICIANS ALSO ACTIVATED AN EMERGENCY SHUTDOWN AND NOTIFIED THE CONTROL CENTER. ADDITIONAL NOTIFICATIONS WERE IMMEDIATELY MADE TO COMPANY, LOCAL, AND FEDERAL EMERGENCY RESPONDERS. OCTOBER 15, THE RELEASE WAS DUE TO A SUDDEN RUPTURE EVENT, AND THE AXIS OF THE RUPTURE ALIGNS WITH THE PIPE�S LONGITUDINAL SEAM WELD. THE FAILED PIPE IS 30-INCH DIAMETER, 0.386-INCH WALL THICKNESS WITH API 5L X70 DOUBLE-SUBMERGED ARC WELDED (DSAW) LONGITUDINAL SEAM MANUFACTURED BY THE BERG STEEL PIPE CORPORATION. A CORRECTIVE ACTION ORDER WAS ISSUED FOR THIS ACCIDENT (CPF NO. 3-2025-018-CAO) AND THE CORRECTIVE ACTIONS OF MECHANICAL AND METALLURGICAL TESTING AND ROOT CAUSE FAILURE ANALYSIS WERE COMPLETED. JANUARY 8, 2026, THE ESTIMATED COSTS WERE UPDATED OTHERWISE THERE ARE NO FURTHER UPDATES; THIS IS THE FINAL REPORT.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: MATERIAL FAILURE OF PIPE OR WELD — MANUFACTURING-RELATED.

PHMSA indexed costs: $52,731,684 reported total cost, $21,412,210.287 in 1984 dollars, $52,731,684 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.
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