GENESIS OFFSHORE HOLDINGS, LLC

Incident Narrative

WHILE PERFORMING A ROUTINE VISIT TO HIA 582 MANIFOLD PLATFORM, GENESIS PERSONNEL NOTICED AN AREA OF DISTURBED WATER TO THE SOUTH OF THE FACILITY. PERSONNEL INVESTIGATED THE AREA WITH A HELICOPTER AND FOUND THAT THERE WERE GAS BUBBLES COMING TO THE SURFACE OVER GENESIS 30"" GAS PIPELINE. PERSONNEL MADE NOTIFICATIONS AND ISOLATED THE PIPELINE SEGMENT. THERE WAS NO SHEEN ASSOCIATED WITH THIS EVENT. DIVE CREW ARRIVED ON THE SCENE FOR REPAIRS WITH A CLAMP. THE DIVERS DESCRIBED THE ENVIRONMENT AS HAVING POOR VISIBILITY BUT DESCRIBED RELEASE POINT AS A THIN ""SPLIT."" UT MEASUREMENTS TAKEN NEAR THE RELEASE SITE INDICATED LITTLE TO NO METAL LOSS ON THE PIPE EXCEPT IMMEDIATELY ADJACENT TO THE SPLIT. AFTER THE TEST, THE PIPE WAS PRESSURED UP AGAIN WITHOUT ANY LEAKAGE. PART E, QUESTION 5C - THIS SEGMENT IS ISOLATED BY CLOSING 3 UPSTREAM VALVES AND ONE DOWNSTREAM VALVE. THE DISTANCE REPORTED IN THIS QUESTION IS THE LONGEST DISTANCE BETWEEN VALVES USED. PART G: EARLY ANALYSIS APPEARS TO POTENTIALLY POINT TO SOME TYPE OF CORROSION EVENT HOWEVER, DUE TO THE DEPTH OF THE PIPE AND THE POOR VISIBILITY ON THE SEA FLOOR, THE DATA AVAILABLE MAKES IT DIFFICULT TO DETERMINE WITH HIGH CONFIDENCE WHETHER IT IS INTERNAL OR EXTERNAL AT THIS TIME. GENESIS WILL COLLABORATE WITH A THIRD PARTY SME TO AID IN THE DETERMINATION. SUPPLEMENTAL (11/18/2020) - AFTER CONSULTING WITH A THIRD PARTY CORROSION EXPERT, GENESIS BELIEVES THE LEAK WAS PROBABLY CAUSED BY INTERNAL CORROSION, HOWEVER IT IS NOT POSSIBLE TO DETERMINE WHAT TYPE OF INTERNAL CORROSION IS RESPONSIBLE WITH A HIGH DEGREE OF CONFIDENCE. PRIOR TO REPAIRING THE LEAK SITE, DIVERS CONDUCTED SEVERAL UT SCANS OF THE RELEASE AREA, BOTH CIRCUMFERENTIALLY AND UPSTREAM/DOWNSTREAM FROM THE RELEASE SPOT. THE TESTS SHOWED METAL LOSS ONLY AT THE SPOT OF THE SPLIT BUT NOWHERE ELSE THAT WAS SCANNED. FURTHER ASSESSMENT IS NOT POSSIBLE SINCE VISIBILITY ON THE SEA FLOOR IS VERY POOR AT THIS SIGHT AND ALSO, THE SEGMENT IS NOT ILI PIGGABLE DUE TO THE DIFFERING PIPE DIAMETERS OF THE CONNECTING UPSTREAM PIPELINES. SINCE AT THIS TIME IT IS DIFFICULT TO DEFINITIVELY DETERMINE WHETHER THE EVENT WAS CAUSED BY INTERNAL OR EXTERNAL CORROSION, GENESIS HAS COMPLETED SEVERAL MITIGATING TECHNIQUES TO ENHANCE THE CATHODIC PROTECTION OF THIS SEGMENT. FIRST, GENESIS HAS INSTALLED AN ADDITIONAL SACRIFICIAL ANODE ON THIS SECTION OF PIPE. SECOND, AN ADDITIONAL WATER TRAP AND CORROSION COUPON HAVE BEEN INSTALLED ON HIA 582. FINALLY, GENESIS INTENDS TO RECOMMEND TREATMENT MEASURES FOR THE UPSTREAM OPERATOR TO FURTHER PROTECT THE DOWNSTREAM SEGMENTS.