TRANSCONTINENTAL GAS PIPE LINE COMPANY

Incident Narrative

PIPE CONTROL RECEIVED A CALL ON JUNE 22 2021 STATING THAT A 3RD PARTY NOTICED BUBBLES IN THE SS-242 BLOCK APPROXIMATELY 2 MILES SOUTH OF SS-229. WE HAVE NOTIFIED THE SOC, WITT O'BRIEN'S, PHMSA, USCG, AND MANY OTHERS. WE ARE CURRENTLY SHOWING 709 PSIG ON THAT SECTION OF THE LINE LOOKING AT SCADA. WE CURRENTLY HAVE THE DSV LADY MONROE WITH C-DIVE DEPARTING THE DOCK AT 11:45 PM ON 6/22/2021, ETA ABOUT NOON 6/23/2021 BUT THEY WILL UPDATE ONCE IN ROUTE. THEY WILL HAVE A 20"" REPAIR CLAMP ON BOARD IF IT IS OURS TO REPAIR AT THAT TIME. WE ALSO HAVE THE ANDI NICOLE IN ROUTE TO SS-214C WITH 2 TECHS, TO START BLOWING DOWN OUR 20"" PIPELINE THAT IS REFERRED TO AS THE SS-269 LINE. THEIR ETA IS 6 AM 6/23/21. RESOLUTION NARRATIVE: 6-23-21 9 AM -WILLIAMS EMPLOYEES STARTED BLOWING DOWN 20"" PIPELINE WITH 709PSIG 10:15 AM -DIVERS ARE ON LOCATION AND SETTING ANCHORS 1:15 AM -DIVERS BELIEVED TO HAVE FOUND THE SOURCE OF THE BUBBLES BUT RAN OUT OF BOTTOM TIME TO CONFIRM LINE SIZE. THEY WILL BE JUMPING ANOTHER DIVER TO VERIFY LINE SIZE 4:30 PM -DIVER IDENTIFIED IT IS WILLIAMS 20"" PIPELINE 6-24-21 4 AM- COMPLETED BLOWDOWN TO TARGET PRESSURE OF 250 PSI TO INSTALL PLIDCO CLAMP 8 AM -CONTINUING TO PREP PIPE FOR CLAMP INSTALLATION 9 AM -FINISHED PREP ON THE PIPE AND PULLING UT READINGS AND AVERAGE OF .490 12:34 PM -CLAMP GOING DOWN ON PIPELINE TO BE INSTALLED 4:40 PM- REPAIR CLAMP WAS PUT INTO POSITION AND WILL TORQUE IN STEPS UNTIL 100% 6-25-21 4:34 AM -CLAMP INSTALLATION COMPLETE BUT THE NEW CLAMP IS LEAKING FROM THE 12OCLOCK POSITION 7 AM- CLAMP IS BEING REMOVED AND NEW SEALS BEING TRANSPORTED FROM BELLE CHASE TO DIVE VESSEL 7 PM -NEW SEALS ARRIVE AND ARE BEING INSTALLED ON THE CLAMP 8:40 PM- CLAMP BEING INSTALLED AND WILL BE TORQUED TO 100% 6-26-21 6 AM- THE SAME ISSUE WITH THE CLAMP SO PETROQUIP WAS CONTACTED AGAIN AND A NEW CLAMP IN ROUTE TO THE DOCK TO BE PUT ON THE M/V 1 PM -CLAMP WAS RECOVERED AND PICTURES SENT TO PETROQUIP FOR INSPECTION OF SEALS. 6-27-21 DOWN ON WEATHER MOST OF THE MORNING 4 PM- CLAMP GOING INTO THE WATER FOR INSTALLATION 10 PM- CLAMP WAS INSTALLED AND TORQUED TO 100% 6-28-21 1:28 AM- STARTED PRESSURING UP THE SYSTEM WHILE CHECKING FOR LEAKS 6:45 AM- REACHED PIPELINE PRESSURE 600PSI AND NO LEAKS REPORTED 6:50 AM -PRODUCERS WERE NOTIFIED TO RESUME FLOW 8 AM- PLACING SANDBAGS AND 3N1 OVER THE CLAMPED AREA. JOB COMPLETE