COLUMBIA GULF TRANSMISSION, LLC

Incident Narrative

COMPANY PERSONNEL WERE PERFORMING A REPAIR ON A GRADE 2 LEAK ON A NEARBY LINE WHEN THEY DISCOVERED A CRACK IN THE WELD OF A 2 INCH TAP ON LINE 300. THE SECTION OF LINE 300 CONTAINING THE LEAK WAS ISOLATED BETWEEN THE COMPRESSOR STATION AND VALVE 808-3; APPROXIMATELY 8.66 MILES AND THE LINE WAS BLOWN DOWN. THE TOTAL ESTIMATED AMOUNT OF UNINTENTIONAL MATERIAL THAT VENTED INTO ATMOSPHERE DURING THIS EVENT THIS LEAK DID NOT EXCEED 3,000 MCF. FURTHER EVALUATION BY THE COMPANY'S ENGINEERING AND PROJECT MANAGEMENT GROUPS DETERMINED THE COST OF REPAIR AND WORK NECESSARY TO BRING THE ISOLATED SECTION OF LINE 300 BACK INTO SERVICE, WOULD EXCEED $50,000. BASED UPON THIS DETERMINATION THE NATIONAL RESPONSE CENTER WAS NOTIFIED. OVER THE COURSE OF THE NEXT 2 DAYS, THE CRACK WAS INVESTIGATED AND REPAIRED. ON APRIL 27, THE LINE WAS PURGED AND RETURNED BACK INTO SERVICE. BASED ON VISUAL EXAMINATION, METALLURGICAL ANALYSES AND MATERIAL ANALYSES, THE METALLURGICAL FAILURE INVESTIGATION PERSONNEL CONCLUDED THAT THE LEAK WAS CAUSED BY A CRACK THROUGH THE WALL OF A 2-IN WELD-O-LET ON THE 36-INCH DIAMETER PIPE CAUSED BY FATIGUE. AS SHOWN ON PAGE 1 OF THIS REPORT, THE INITIAL INCIDENT REPORT WAS SUBMITTED ON MAY 22, 2014 AND THE ASSIGNED REPORT NUMBER WAS: 20140056 - 16407