GULF SOUTH PIPELINE COMPANY, LLC

Incident Narrative

ON AUGUST 6, 2020, A CENTERPOINT ENERGY EMPLOYEE REPORTED A POSSIBLE NATURAL GAS LEAK ON GULF SOUTH PIPELINE'S MCCOMB 6-INCH (INDEX 302) LINE IN TERRY, MS. GULF SOUTH OPERATIONS EMPLOYEES WERE DISPATCHED TO INVESTIGATE AND DETERMINED A MINOR LEAK OF UNKNOWN CAUSE. THE PRESSURE ON THE PIPELINE WAS REDUCED BY 20% UNTIL REPAIRS COULD BE MADE. PREPARATIONS WERE MADE TO INSTALL A WELD OVER BUT, UPON EXCAVATION, IT WAS DETERMINED THAT THIS WOULD NOT BE A FEASIBLE APPROACH. AT THIS POINT, THIS BECAME A REPORTABLE INCIDENT. THE LINE WAS TAKEN OUT OF SERVICE ON AUGUST 13, 2020 AT 07:00 FOR REPAIRS. INITIALLY, THE CAUSE WAS SUSPECTED TO BE A LEAKING DRESSER COUPLING BUT THE CAUSE WAS DETERMINED TO BE EXTERNAL CORROSION. APPROXIMATELY 250 FEET OF PIPE WAS REPLACED AND THE LINE RETURNED TO SERVICE ON AUGUST 15, 2020 AT 16:00. ON PART G, QUESTION 4A OF THIS REPORT, THE RESPONSE TO THE YEAR THAT CATHODIC PROTECTION ON THIS PIPELINE STARTED IS SPECULATION BASED ON EMPLOYEE HISTORICAL KNOWLEDGE; THE EXACT YEAR IS UNKNOWN. 9-8-2020 SUPPLEMENTAL REPORT SUBMITTED TO CORRECT RESPONSES TO QUESTIONS B4 AND C6 AS DIRECTED BY PHMSA AND CORRECT RESPONSE TO QUESTION A20C.