SOUTHERN NATURAL GAS CO

Incident Narrative

BECAUSE OF PIPELINE DEPTH AND DEVELOPING SITE CONDITIONS, A PREVIOUSLY PLANNED ANOMALY REPAIR PROJECT HAD BEEN HALTED WITH THE DECISION TO RETURN THE PIPELINE TO SERVICE UNTIL NECESSARY PROJECT DETAILS AND ADDITIONAL PLANS WERE ESTABLISHED TO PROPERLY CONTINUE THE ANOMALY REPAIR PROJECT. OCTOBER 18, 2018, OPERATIONS HAD BEGUN FLOWING NATURAL GAS INTO THE VACATED VALVE SECTION. TWENTY MINUTES INTO THE RE-PRESSURE PROCESS, SNG OPERATIONS AND SNG ANOMALY REPAIR CONTRACT EMPLOYEES NOTICED BUBBLES APPEARING IN JAKE'S BAYOU. VALVES WERE IMMEDIATELY CLOSED; RELEASE OF NATURAL GAS WAS AN EIGHT MINUTE DURATION. PRESSURE OF THE NATURAL GAS IN THE VALVE SECTION WAS 26 PSIG. WITH THE VALVE SECTION AT ZERO PRESSURE, OCTOBER 31, 2018, THE SNG CONTRACTOR SUCCESSFULLY RECOVERED THE PIPE CONTAINING EXCAVATION DAMAGE. FOLLOWING THE NECESSARY PERMITTING PROCESS AND THE BEGINNING OF LOW WATER SEASON IN THE BAYOU, THIRD QUARTER 2019, SNG'S CONTRACTOR BEGAN THE PIPELINE REPAIR PROCESS IN JAKE'S BAYOU. DECEMBER 04, 2019, SNG RETURNED THE REPAIRED PORTION OF THE SOUTH SECTION 28 LINE TO SERVICE.