"GULF SOUTH PIPELINE COMPANY, LLC"

Incident Narrative

"ON 11/24/24 AT APPROXIMATELY 20:56, A PIPELINE RUPTURE OCCURRED ON GULF SOUTH'S BISTINEAU STORAGE FIELD WELL LINE A-11, ALSO REFERRED TO AS INDEX 900-8. THE RUPTURE WAS INITIALLY IDENTIFIED BY A GULF SOUTH OPERATIONS EMPLOYEE WHO LIVES ONSITE. THE BI-DIRECTIONAL 8-INCH O.D. WELL LINE CONNECTS THE SINGLE A-11 WELL TO THE A LATERAL PIPELINE TRUNK BETWEEN THE COMPRESSOR STATION FIELD HEADER AND THE STORAGE FIELD. THE A-11 WELL WAS SHUT IN, ALONG WITH THE CORRESPONDING VALVES LOCATED ON THE A LATERAL TRUNK PIPELINE, ALLOWING GULF SOUTH TO TOTALLY ISOLATE THE AFFECTED WELL LINE FROM THE STORAGE FIELD AND COMPRESSOR STATION FIELD HEADER. THIS ENABLED THE AFFECTED LINE SEGMENT TO BE FULLY DEPRESSURIZED. THE LINE SEGMENT REMAINED ISOLATED AND DEPRESSURIZED UNTIL A PIPE REPLACEMENT WAS COMPLETED. REPAIR WAS COMPLETED ON 12/11/24 BY PIPE REPLACEMENT. THE FAILED SECTION OF PIPE AND A SHORT PUP FROM EACH END OF THE REMAINING PIPE WERE INSPECTED ON SITE BY GULF SOUTH'S METALLURGIST, WRAPPED, AND SENT TO A LAB FOR FURTHER ANALYSIS WHICH HAS NOT YET BEEN COMPLETED. THE FIELD EXAMINATION DETERMINED THE PRELIMINARY CAUSE OF THE FAILURE TO BE INTERNAL CORROSION. ADDITIONALLY, PHMSA ASKED HOW THIS PIPELINE IS TREATED. IT IS TREATED USING A CONTINUOUS INJECTION PUMP. A CORROSION INHIBITOR, SPECIFICALLY COASTAL CHEMICAL 1141-C, IS INJECTED WHEN THE FIELD IS IN WITHDRAWAL MODE. ON AVERAGE, 0.25 TO 0.5 GALLONS PER DAY OF CHEMICAL IS PUMPED. 1/24/25 UPDATED RESPONSE TO C3G AND PART H PER PHMSA REQUEST."