SEMGAS, L.P.

Incident Narrative

ON JANUARY 7, 2020, AT APPROXIMATELY 11:30 HRS, SEMGAS EXPERIENCED A GAS LEAK ON A REGULATED CLASS 1 TRANSMISSION LINE, THE ENABLE RESIDUE 16 INCH ON THE ROSE VALLEY PLANT SALES PIPELINE. THIS PIPELINE IS LOCATED IN WOODS COUNTY, 11 MILES SOUTHWEST OF ALVA, OKLAHOMA. OPERATIONS PERSONNEL WAS CONDUCTING A PIPELINE LEAK DETECTION SURVEY IN THE AREA AND DETECTED A HIGH HYDROCARBON LEL READING AND NOTICED BARE VEGETATION IN THE AREA. OPERATIONS PERSONNEL NOTIFIED THEIR SUPERVISOR OF A POTENTIAL LEAK. AT APPROXIMATELY 11:40 HRS, OPERATIONS PERSONNEL CLOSED THE UPSTREAM AND DOWNSTREAM BLOCK VALVES TO ISOLATED THE POTENTIAL LEAK AND BEGAN TO REDUCE THE PRESSURE. ON JANUARY 8, 2020 A CONTRACT CREW BEGAN EXCAVATION OF THE PIPELINE. ONCE THE PIPELINE WAS EXPOSED, OPERATIONS PERSONNEL DISCOVERED A PINHOLE LEAK ON THE PIPELINE'S LONGITUDINAL SEAM. A TOTAL OF 51 FEET OF PIPE WAS REMOVED AND THE AFFECTED PIPE SEGMENT WAS SENT TO THE LAB FOR ANALYSIS. THE 51 FEET OF PIPE WAS REPLACED WITH NEW PIPE TO PREVENT OTHER LEAKS FROM OCCURRING. ON JANUARY 14, 2020 AT APPROXIMATELY 17:38 HRS, THE PIPELINE WAS PUT BACK INTO SERVICE. THIS PIPELINE IS UNDER THE JURISDICTION OF THE OKLAHOMA CORPORATION COMMISSION. ON JANUARY 9, 2020, THIS INCIDENT WAS TELEPHONICALLY REPORTED TO THE NATIONAL RESPONSE CENTER (NRC#1268323) AT 17:06 HRS. AND TO THE OCC AT 17:10 HRS. THIS INCIDENT BECAME A REPORTABLE INCIDENT ONCE THE ESTIMATED REPAIR COST WENT OVER THE $50,000.00 LIMIT. A 48 HOUR NRC UPDATE WAS MADE ON JANUARY 10, 2020 AT 11:21 HRS. (NRC#1268361) ON FEBRUARY 7, 2020, LAB RESULTS CONFIRMED THE LEAK WAS DUE TO MANUFACTURER'S DEFECT IN THE PIPELINE'S LONGITUDINAL SEAM WELD. FURTHER CONSIDERATIONS WILL BE MADE FOR FUTURE ILI ASSESSMENTS IN ORDER TO DETERMINE THE OVERALL CONDITION OF THE REMAINING PIPE.