ENERGY TRANSFER COMPANY

Incident Narrative

ON SATURDAY, 02/20/21, AT 01:22, A RELIEF VALVE OPENED ON THE 2ND CUT REGULATOR AT THE HANDLEY 2000 YARD AT THE TEXGEN HANDLEY POWER PLANT DUE TO A FREEZE IN THE GAS SUPPLY LINE TO THE INSTRUMENTATION. THE TEXGEN HANDLEY POWER PLANT IS SUPPLIED NATURAL GAS VIA PIPELINE FROM THE 9046 HANDLEY 12IN LATERAL AT THE HANDLEY 2000 YARD. AT APPROXIMATELY 01:23, GAS CONTROL NOTIFIED OPERATIONS PERSONNEL THAT THE RELIEF VALVE ACTUATED AT APPROXIMATELY 01:22. OPERATIONS PERSONNEL WERE ON LOCATION AT THE HANDLEY 2100 YARD DUE TO THE EXTREME WEATHER CONDITIONS WHEN THE RELIEF VALVE AT HANDLEY 2000 YARD ACTUATED. OPERATIONS PERSONNEL ARRIVED ON LOCATION AT THE HANDLEY 2000 YARD AT 01:30 AND THE MAINLINE BLOCK VALVE WAS CLOSED AT 01:38. ONCE THE PRESSURE WAS RELIEVED ENOUGH FOR THE RELIEF VALVE TO RE-SEAT, THEN THE MAINLINE BLOCK VALVE WAS RE-OPENED IN ORDER TO MAINTAIN THE GAS SUPPLY TO THE POWER PLANT. OPERATIONS BEGAN ASSESSMENT OF THE SITUATION AND DETERMINED THAT THE GAS SUPPLY LINE TUBING EXPERIENCED A FREEZE, THE FREEZE WAS IDENTIFIED AND THE SUPPLY LINE WAS CLEARED. OPERATIONS REINSULATED THE GAS SUPPLY LINES. THE FLOW TO THE TEXGEN HANDLEY POWER PLANT AT THE HANDLEY 2000 YARD WAS NOT FULLY INTERRUPTED TO THE TEXGEN HANDLEY POWER PLANT. DUE TO THE CRITICAL NATURE OF THE SUPPLY POINT TO THE TEXGEN HANDLEY POWER PLANT DURING THE EXTREMELY COLD WEATHER CONDITIONS, OPERATIONS PERSONNEL REMAINED ON SITE AT THE LOCATION TO MINIMIZE ANY DOWN TIME TO THE TEXGEN HANDLEY POWER PLANT. ENERGY TRANSFER'S PLAN TO PREVENT A RECURRENCE INCLUDES OVERHAULING THE REGULATOR AT THE HANDLEY 2000 YARD. DUE TO THE AGE OF THE REGULATOR THE LEAD TIME FOR REPLACEMENT PARTS IS CURRENTLY 12 WEEKS. REPLACEMENT OF THE PILOT AND HEATER FOR THE GAS SUPPLY LINE WAS COMPLETED MARCH 3, 2021.