ENABLE GAS TRANSMISSION, LLC

Incident Narrative

ON JUNE 9, 2017 AN EXTERNAL CORROSION DIRECT ASSESSMENT DIG WAS PERFORMED ON ENABLE GAS TRANSMISSION LINE JM-8 (AT THE TAP FOR JM-9) AND A MINOR LEAK WAS FOUND DURING THE RE-COATING PROCESS. THE LEAK IS IN A CLASS 3 HCA LOCATION. LEL LEVELS WERE MEASURED TO BE 18% DIRECTLY AT THE LEAK AND 0% WHEN INSTRUMENT IS REMOVED FROM THE WELD. THE LEAK IS FROM THE WELD OF THE SADDLE TO THE 6 INCH PIPE OF JM-8. IT IS WELDED AT THE NECK OF THE 3 INCH TAP FOR JM-9. THERE MUST BE A LEAKING WELD AT THE TAP FITTING WELD IN ORDER FOR IT TO BE LEAKING FROM THE SADDLE WELD. WE WILL NOT BE ABLE TO DETERMINE THE CAUSE OF THE LEAK UNTIL REPAIR IS COMPLETED. AS OF JULY 13, 2017 WE ARE WAITING ON PARTS FOR REPAIR AND MONITORING LEAK DAILY UNTIL REPAIRS ARE COMPLETED. THERE ARE SEVERAL DWELLINGS AND A CHURCH WITHIN 660FT OF THE LEAK SITE, WHICH PROMPTED A 20% DROP IN PRESSURE FROM 675 PSIG TO 540 PSIG OR LESS. WHILE PLANNING THE REPAIR IT WAS DETERMINED THAT THE ESTIMATED REPAIR COSTS COULD EXCEED $50,000, MEETING THE DEFINITION OF AN INCIDENT. DUE TO THIS, NOTIFICATION WAS PROVIDED TO THE NRC ON JUNE 16, 2017 (NRC #1181336). A FOLLOW UP CALL WAS PLACED TO THE NRC ON JUNE 18, 2017 (NRC #1181499). PLAN OF REPAIR INCLUDES REMOVAL OF THE ENTIRE SET UP AND RE-FABRICATE THE TAP AND RISER WHICH THE FABRICATION COULD BE DONE OFF SITE AND TESTED. WE WILL THEN INSTALL (2) 6 INCH STOPS AND HOSE BYPASS TO KEEP THE DOWNSTREAM CUSTOMERS ON JM-8 AND JM-9 IN SERVICE AND DROP IN THE NEW FABRICATION WITH 2 WELDS MINIMIZING BYPASS TIME. WHEN THE REPAIRS ARE COMPLETED, I WILL FOLLOW UP WITH A SUPPLEMENTAL REPORT. UPDATE 11/30/17 THE LEAK WAS STOPPED AND REPAIRED ON 11/28/17. THE FOLLOWING SECTIONS WERE UPDATED: A.15 UPDATED TO INDICATE SHUTDOWN TO REPAIR PIPELINE D.7 UPDATED TO REFLECT TOTAL COSTS UPDATE 1/9/18 FINAL COSTS AND ROOT CAUSE DETERMINED. A.10 GAS LOSS UPDATED D.7.B, D.7.F, D.7.G UPDATED TO REFLECT FINAL COST G.5.1, G.5.2, G.5.4 UPDATED TO REFLECT ROOT CAUSE UPDATE 1/10/18 CHANGES MADE TO INCORPORATE AID FEEDBACK A.4 DATE CHANGED A.7 TIME CHANGED A.8 INCIDENT RESULTED FROM: CHANGED TO UNINTENTIONAL RELEASE OF GAS