TRANSCONTINENTAL GAS PIPE LINE COMPANY

Incident Narrative

ON MARCH 4, 2022, WILLIAMS OPERATIONS REP RECEIVED A CALL FROM A THIRD PARTY INSPECTOR FOR P66 NOTING FUMES AND A HISSING SOUND APPROXIMATELY 2200FT FROM THE WILLIAMS P66 CROSSING TO THE WEST. WILLIAMS SUPERVISION CALLED IN OFFSHORE OPERATIONS REP WITH HELICOPTER TO FLY OVER THE SUBJECT AREA AT 9:31AM. AT 11:38AM, WILLIAMS SUPERVISION RECEIVED A VIDEO FROM WILLIAMS OPERATIONS REP FROM THE FLY OVER AND ALSO THE GPS COORDINATES OF THE LOCATION. AT THAT POINT, WILLIAMS IDENTIFIED THE LOCATION WAS IGNITED AND WAS A LOCALIZED BURN AREA IN THE MARSH. AT 11:42AM, WILLIAMS SUPERVISION CALLED PIPELINE CONTROL TO NOTIFY OF NEED TO ISOLATE THE RACELAND LATERAL. THE LINE SEGMENT WAS THEN ISOLATED AND BLOWDOWN OF THE LINE STARTED AT 2:09 PM. AT 4:12PM, ANOTHER HELICOPTER OVERFLIGHT WAS CONDUCTED AND THE FIRE WAS MUCH SMALLER THAN ORIGINAL, NOW APPROXIMATELY 1FT IN HEIGHT. AT 4:30PM, 1 PSI CONFIRMED ON THE SECTION ISOLATED AND BLOWN DOWN. FIRE CONFIRMED OUT ON MARCH 5, AT 7AM WITH OVERFLIGHT. LINE DOWN AND SAFE. WILLIAMS OPERATIONS VISITED SITE VIA AIRBOAT AND IDENTIFIED LINE IS 5FT DEPTH IN MARSH. APPROXIMATELY 1FT OF SOLID, THEN ALL LOOSE MARSH/WATER. WILLIAMS NOTIFIED FERC AND OCM ON MARCH 10 OF INTENT TO REPAIR UNDER EMERGENCY USE AUTHORIZATION. ALL APPROVALS RECEIVED FOR EXCAVATION AND REPAIR ON MARCH 11. THE PIPELINE WAS PLANNED TO BE EXCAVATED VIA MARSH EXCAVATOR, BUT ONLY THE TOP 1FT WAS ABLE TO BE REMOVED. DIVERS HAD TO BE CALLED IN TO INSTALL AN 8"" PLIDCO HIGH PRESSURE CLAMP OVER THE LEAK LOCATION. DIVERS REMOVED COATING AND CLEANED AREA PER MANUFACTURER'S REQUIREMENTS, THEN INSTALLED CLAMP AND TORQUED. ONLY ONE LEAK LOCATION WAS IDENTIFIED, APPROXIMATELY 0.15INCHES DIAMETER. ON MARCH 17, CLAMP WAS INSTALLED, TORQUED AND LINE PRESSURED BACK UP TO CONFIRM LEAK REPAIR. LINE WAS APPROVED TO RETURN TO SERVICE AT 9AM ON MARCH 18. WILLIAMS IS EVALUATING POSSIBLE PREVENTIVE MEASURES.