THIRD COAST ALABAMA, LLC

Incident Narrative

THE LEAK OCCURRED ON THE THIRD COAST ALABAMA, LLC., 12 INCH MONTGOMERY COLUMBUS PIPELINE DUE TO EXTERNAL CORROSION (LOCALIZED PITTING). A COUPON HAS BEEN CUT OUT AND SENT TO A THIRD PARTY FOR METALLURGICAL ANALYSIS AT THE POINT OF FAILURE AS A PART OF THE INVESTIGATION INTO THE ROOT CAUSE. A NEW PIECE OF PIPE WAS PRE-HYDROTESTED AND WELDED INTO PLACE AND THE LINE WAS PLACED BACK INTO SERVICE. CORROSION CONTROL-CORROSION MONITORING SUBPART I REQUIREMENTS FOR CORROSION CONTROL IN ACCORDANCE WITH SCOPE 192.451 IT IS THE INTENT OF THIRD COAST ALABAMA, LLC TO CONTINUE TO MAINTAIN REQUIREMENTS FOR THE PROTECTION OF METALLIC PIPELINES FROM EXTERNAL, INTERNAL, AND ATMOSPHERIC CORROSION PROGRAMS ESTABLISHED. IT IS ALSO A CRITICAL REQUIREMENT THAT THIRD COAST ALABAMA, LLC WILL MAINTAIN AND SUPPORT UNDER 195.453 AND UNDER THE CORROSION CONTROL PROCEDURES REQUIRED BY 192.605(B)(2), INCLUDING THOSE FOR DESIGN, INSTALLATION, OPERATION, AND MAINTENANCE OF CATHODIC PROTECTION SYSTEMS, MUST BE CARRIED OUT BY, OR UNDER THE DIRECTION OF , A PERSON QUALIFIED IN PIPELINE CORROSION CONTROL METHODS. I. EXTERNAL CORROSION CONTROL PROGRAM THE CURRENT EXTERNAL CATHODIC PROTECTION PROGRAM AND GOING FORWARD WILL ADHERE TO THE STRINGENT REQUIREMENTS OF 192.457, 192.459, 192.461, 192.463, 192.467, 192.469, 192.471, 192.473 THE CURRENT EXTERNAL CORROSION CONTROL: MONITORING PROGRAM AND GOING FORWARD WILL ADHERE TO THE STRINGENT REQUIREMENTS OF 192.465 (A-E). II. INTERNAL CORROSION CONTROL PROGRAM THE CURRENT INTERNAL CORROSION CONTROL PROGRAM AND GOING FORWARD WILL ADHERE TO THE STRINGENT REQUIREMENTS OF 192.475, 192.476, 192.461, 192.463, 192.467, 192.469, 192.471, 192.473 THE CURRENT INTERNAL CORROSION CONTROL: MONITORING PROGRAM AND GOING FORWARD WILL ADHERE TO THE STRINGENT REQUIREMENTS OF 192.477. III. ATMOSPHERIC CORROSION CONTROL PROGRAM THE CURRENT ATMOSPHERIC CORROSION CONTROL PROGRAM AND GOING FORWARD WILL ADHERE TO THE STRINGENT REQUIREMENTS OF 192.479 THE CURRENT ATMOSPHERIC CORROSION CONTROL: MONITORING PROGRAM AND GOING FORWARD WILL ADHERE TO THE STRINGENT REQUIREMENTS OF 192.481. IV. CORROSION CONTROL PROGRAM REMEDIAL MEASURES THE CURRENT REMEDIAL CORROSION CONTROL PROGRAM AND GOING FORWARD WILL ADHERE TO THE STRINGENT REQUIREMENTS OF 192.483, 192.485. THIRD COAST ALABAMA, LLC RESERVES THE RIGHT TO CONDUCT DIRECT ASSESSMENT UNDER 192.490 AS DEFINED IN 192.903. FURTHERMORE, THIRD COAST ALABAMA, LLC WILL CONTINUE TO MAINTAIN A STRICT GUIDELINE TO CORROSION CONTROL RECORDS AS MANDATED BY STATUTE UNDER 192.491. 8-5-2020 UPDATE AN ANALYSES PERFORMED BY A THIRD PARTY INDICATED THAT THE SAMPLE PERFORATED FROM WALL LOSS DUE TO UNDERGROUND EXTERNAL CORROSION IN THE LOCATIONS WITH INADEQUATE COATING OR COATING DISBONDMENT AND INSUFFICIENT CATHODIC PROTECTION. SIDERITE IN THE OUTSIDE SURFACE DEPOSITS AND THE GHOST PEARLITE OBSERVED IN THE CORROSION SCALE INDICATED CONTRIBUTION FROM CARBONIC ACID CORROSION, WHICH REQUIRES PRESENCE OF CO2 AND WATER. THE SOURCE OF THE C02 IS LIKELY FROM THE GEOCHEMICAL REACTIONS IN THE SOIL.