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SUNOCO PIPELINE L.P.

hazardous_liquid Incident —

Incident Information

Report Date—
OperatorSUNOCO PIPELINE L.P.
Commodity—
Pipeline Typehazardous_liquid

Location

State
Coordinates32.73665, -99.82082

Cause

CauseMATERIAL FAILURE OF PIPE OR WELD
Subcause—

Casualties

Fatalities0
Injuries0

Costs

Property Damage—
Lost Commodity—
Public/Private Damage—
Emergency Response—
Environmental Remediation—
Other Costs—

Location Map

Incident Narrative

ON FEBRUARY 20, 2021 AT APPROXIMATELY 11:30AM WHILE THE AERIAL PATROL WAS FLYING THE PIPELINE; THE PILOT NOTICED OIL ON THE GROUND. THE PILOT IMMEDIATELY NOTIFIED THE OPERATIONS MANGER AND A PIPELINER WAS DISPATCHED TO THE LOCATION TO INVESTIGATE. AT 12:07PM THE PIPELINER ARRIVED ON SITE AND CONFIRMED THE RELEASE WAS COMING FROM THE HAWLEY TO RULE 10 INCH PIPELINE. APPROXIMATELY 195 BARRELS OF CRUDE WAS RELEASED. A CALL WAS PLACED TO THE TX RRC AT 12:25PM (INCIDENT # 2368). AT THE SAME TIME, IT WAS DETERMINED THAT RELEASE WOULD MEET THE TELEPHONIC REPORTING CRITERIA AND CALL WAS PLACED TO THE NRC AT 1:03PM (NRC # 1298505). AN OSRO WAS CONTACTED AND ARRIVED ON SITE TO PICK UP ALL FREE-STANDING PRODUCT AND REMOVE THE CONTAMINATED SOIL. ON FEBRUARY 22,2021 AT 8:18AM A 48HR UPDATE WAS PLACED TO THE NRC (NRC # 1298638). UPON INVESTIGATION, IT WAS DETERMINED THAT THE PIPE IN THIS AREA WAS COLLARED PIPE AND THE THREADS FOR THE COLLAR SEPARATED RESULTING IN THE RELEASE. TO PREVENT RECURRENCE, THE SECTION UP PIPE THAT INCLUDED THE COLLAR WAS CUT OUT AND REPLACED WITH NEW PIPE ON FEBRUARY 22ND AND LOWERED ACROSS THE ROAD WAY TO A DEEPER DEPTH. THE PIPELINE WAS RESTARTED ON FEBRUARY 23RD. UPDATE: THE RESULTS OF THE METALLURGICAL ANALYSIS INDICATED THAT THE FAILURE OCCURRED AT THE THREADS AS A RESULT OF BRITTLE OVERLOAD. THE OVERLOAD LIKELY OCCURRED AS A RESULT OF TENSILE STRESSES PRODUCED BY LONGITUDINAL OR BENDING FORCES. THE FAILURE ORIGINS WERE LOCATED AT THE ROOT OF A THREAD AT THE 2:34 ORIENTATION. CONTRIBUTING FACTORS TO THE FAILURE INCLUDE THE GEOMETRY OF THE THREADS AND THE TOUGHNESS PROPERTIES OF THE PIPE. THE GEOMETRY OF THE THREADS CREATED A STRESS CONCENTRATION AT THE ROOT OF THE THREAD, AND THE TAPER OF THE THREADS RESULTED IN A REDUCED WALL THICKNESS, INCREASING THE STRESS STATE IN THE PIPE AT THE FAILURE ORIGIN. THE HIGH TRANSITION TEMPERATURE OF THE STEEL RESULTED IN BRITTLE FRACTURE. FURTHER, THE COLD WORKING ASSOCIATED WITH CREATING THE THREADS DECREASED THE DUCTILITY AT THE THREADS.

About This Pipeline Incident

Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.

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