ACADIAN GAS PIPELINE SYSTEM

Incident Narrative

AT 12:54 PIPELINE CONTROL CENTER RECEIVED AN ALARM ON THE KOCH-GEISMAR 16"" PIPELINE NEAR THE MISSISSIPPI RIVER ROAD, HIGHWAY 75, IN GEISMAR, LOUISIANA. PIPELINE CONTROL CENTER DISPATCHED OPERATIONS TO SHUT DOWN ALL RELATED PIPELINES IN THE IMMEDIATE AREA UNTIL FIELD VERIFICATIONS COULD BE DETERMINED AS TO THE CAUSE OF THE LOW PRESSURE. OPERATIONS PERSONNEL ARRIVED AT APPROXIMATELY 13:30 AND FOUND A RUPTURED PIPELINE WITH FIRE AND EMERGENCY OFFICIALS ON SITE. AT 13:32 IT WAS DETERMINED THE RUPTURE EXCEEDED REPORTING REQUIREMENTS AND THE NRC WAS NOTIFIED AT 13:44. THE FIRE SELF-EXTINGUISHED AT 15:42 AND THE SITE WAS SECURED BY COMPANY PERSONNEL. THE FRACTURE SURFACE COINCIDED WITH AN AREA OF CORROSION PRESENT ALONG THE BOTTOM OF THE PIPE. METALLOGRAPHY CONFIRMED THE PRESENCE OF INTERNAL CORROSION AND IDENTIFIED AN ISOLATED AREA OF ENVIRONMENTAL CRACKING PRESENT AT THE BASE OF THE INTERNAL CORROSION. THE EXACT ENVIRONMENT THAT CONTRIBUTED TO THE OBSERVED CORROSION AND CRACKING IS UNKNOWN. THE KOCH-GEISMAR 16"" PIPELINE REMAINS OUT OF SERVICE PURGED OF PRODUCT AND CAPPED UNDERGROUND AT THE SITE OF THE INCIDENT. THE CHICO D 20"" NORTH PIPELINE NEAR THE KOCH-GEISMAR 16"" PIPELINE RUPTURE SITE HAS BEEN MODIFIED REPLACING A BELOW GROUND VALVE WITH AN ABOVE GROUND VALVE AND RETURNED TO SERVICE. 48 HR. NRC NUMBER 1202025 A SUPPLEMENTAL/FINAL REPORT ON JULY 12, 2018 REFLECTS A CHANGE TO PART E 5(A) CHANGING ORIGINAL VALVE CLOSED TO REMOTELY OPERATED. A SUPPLEMENTAL/FINAL REPORT ON SEPTEMBER 3, 2021 REFLECTS A CHANGE TO PART A 16(B) UPDATING LOCAL TIME PIPELINE WAS RESTARTED. THE OVERALL SYSTEM WAS PLACED BACK INTO SERVICE AT THIS TIME. THE 16"" PIPELINE WAS REPLACED AT A LATER DATE WITH A 8"" PIPELINE. SEVERAL OTHER UPDATES WERE REQUIRED WITHIN THE REPORT DUE TO THE NEW FORM REQUIREMENTS.