TENNESSEE GAS PIPELINE COMPANY

Incident Narrative

02/22/2018; STORM WEATHER CAUSED A LOSS OF COMMERCIAL ELECTRICAL POWER AND COMMUNICATIONS AT TGP STATION 315 AT 16:25 EST OR LATER. WITH LOSS OF COMMERCIAL POWER, THE STATION ESD SYSTEM FUNCTIONED AS DESIGNED. 16:35 EST, GAS CONTROL NOTIFIED OPERATORS AT MANNED STATION 313 OF STATION 315 COMPRESSOR UNITS FALLING OFF-LINE. TECHNICIANS WERE IMMEDIATELY DISPATCHED AND ARRIVED AT STATION 315 AT 18:00 EST AND FOUND NATURAL GAS VENTING TO ATMOSPHERE FROM THE STATION BLOW DOWN. TECHNICIANS FOUND VALVE AS-2 HAD NOT CLOSED. TECHNICIANS CLOSED VALVE AS-2 AT 18:10 EST THEREBY TERMINATING THE UNINTENTIONAL NATURAL GAS VENTING. THE STATION UPS AND BPS SYSTEMS, WHICH HAD SHUT OFF AS UPS DEPLETED, WERE TESTED AND RESET. THE CONTROLS OF VALVE AS-2 WERE TESTED, FLUID LEVELS CHECKED AND THE VALVE WAS GREASED. STATION 315 WAS RETURNED TO SERVICE ON 02/22/2018 AT APPROXIMATELY 21:50 PM, EST. THERE WAS NO CUSTOMER IMPACT. INVESTIGATION AND MODIFICATIONS CONTINUED. 03/23/ 2018, DEBRIS WAS CLEANED FROM FILTERS OF VALVE CONTROLLERS IN THE YARD. UPS WAS RETIRED AND BPS PROVIDED ANOTHER ELECTRICAL SOURCE. 05/18/2018, STATION ESD SYSTEM TESTED PROPERLY. TESTING OF THE EMERGENCY GENERATOR WAS COMPLETED ON 06/27/2018; AN ISSUE WAS FOUND WITH THE AIR / FUEL CONTROLLER THUS UNIT WAS NOT PROVIDING FULL STATION LOAD, NOT SUPPORTING UPS AND BPS. REPAIR OF AIR / FUEL CONTROLLER HAS BEEN COMPLETED.