PHILLIPS 66 PIPELINE LLC

Incident Narrative

ON DECEMBER 28, 2019 FIRE DEPARTMENT PERSONNEL NOTIFIED CONTROL CENTER OF SMALL FIRE NEAR THE PALO DURO STATION. AFTER THE FIRE WAS EXTINGUISHED IT APPEARED THAT THERE WAS OIL POOLED AND BUBBLING. HEAVY RAINS MADE ACCESS TO THE SITE DIFFICULT. CONTROL CENTER SHUT DOWN AND ISOLATED THE WT-10 AND WT-80 PIPELINES THAT ARE IN THE GENERAL AREA. ON DECEMBER 28, 2019 AT APPROXIMATELY 11:33 AM COMPANY CREWS VERIFIED THAT THE WT-80 WAS LEAKING. NRC WAS NOTIFIED AT DECEMBER 28, 2019 12:25 PM. EXCAVATION AND REPAIRS WILL BE COMPLETED IN THE NEXT COUPLE OF WEEKS. CAUSE OF ACCIDENT WILL BE DETERMINED AFTER PIPE IS REMOVED AND EXAMINED. 6/02/2020 PRELIMINARY REPORT IT APPEARS THAT THE WT-80 PIPELINE LEAKED DUE TO LIGHTENING OR ARC STRIKE. SIGNIFICANTLY HIGH HARDNESS AND MARTENSITIC MICROSTRUCTURE AT THE LEAK LOCATION CONFIRMED PHASE TRANSFORMATION DUE TO LIGHTENING OR ARC STRIKE FOLLOWED BY RAPID QUENCHING. A 14 MIL DEEP CRACK INITIATING IN THE ERW SEAM HAZ WAS OBSERVED, MOST-LIKELY DUE TO FATIGUE. THIS SHALLOW FATIGUE CRACK APPEARED TO BE BLUNTED AND DORMANT. SERVICE INDUCED INTERNAL CORROSION WAS MINIMAL. PIPE CHEMISTRY AND MICROSTRUCTURE WERE NORMAL FOR API 5L GR. X42 STEEL. MECHANICAL TESTING WILL BE CONDUCTED TO VERIFY THE CAUSE OF THE LEAK. 7/28/2020 FINALIZED REPORT MECHANICAL TESTING DETERMINED THAT THE LEAK WAS DUE TO AN ELECTRIC ARC STRIKE MOST LIKELY LIGHTNING. THE HIGH HARDNESS VALUES AND MELTED FROZEN MARTENSITIC MICROSTRUCTURE AT THE LEAK LOCATION CONFIRMED PHASE TRANSFORMATION DUE TO A LIGHTNING ARC STRIKE FOLLOWED BY RAPID QUENCHING. A SHORT, ~14 MIL DEEP, FLAW WAS OBSERVED IN THE HEAT AFFECTED ZONE OF ERW. THIS FLAW APPEARED TO BE BLUNTED AND DORMANT. EXCEPT FOR THIS FLAW, THE ERW SEAM WELD WAS OF GOOD QUALITY WITH NO HOOK CRACKS, LACK OF FUSION OR EXCESSIVE INTERNAL FLASH. INTERNAL CORROSION WAS MINIMAL AND THE PIPE MET THE CHEMISTRY AND MECHANICAL PROPERTIES REQUIREMENTS FOR API 5L GR. X-42.