COLORADO INTERSTATE GAS CO

Incident Narrative

02:53 CIG TOTEM STATION NOTICED PRESSURE CHANGE AT LATIGO STATION AND CALLED OUT TECHNICIANS TO RESPOND; CIG GAS CONTROL ALSO NOTICED PRESSURE CHANGE; 03:24 TECHNICIANS ARRIVED AT LATIGO STATION AND CONFIRMED TWO 6-INCH VENT VALVES WERE RELEASING NATURAL GAS; TECHNICIANS ATTEMPTED TO STOP THE NATURAL GAS RELEASE BY USE OF STATION ESD SYSTEM; STATION ESD SYSTEM DID NOT FUNCTION PROPERLY; 03:30 A LOCAL FIRE CHIEF ARRIVED, NOTIFIED BY LANDOWNERS; BY THIS TIME LANDOWNERS HAD ALSO CALLED CIG GAS CONTROL; 03:34 TECHNICIANS COMPLETED CLOSING STATION BLOCK VALVE THUS STOPPING THE RELEASE OF NATURAL GAS; WITH THE VALVE CLOSURE, THE STATION WAS SHUT IN AND ISOLATED; INVESTIGATION FOUND FROZEN AIR SUPPLY LINES INCLUDING FROZEN INSTRUMENT AIR LINES; SAID FROZEN LINES ALLOWED THE TWO 6-INCH VENT VALVES TO OPEN; SAID FROZEN LINES PREVENTED THE ESD SYSTEM FROM PROPER FUNCTION; THE AIR SUPPLY SYSTEM WAS FLUSHED; A NEW AIR DRYER WAS INSTALLED IN THE AIR SUPPLY SYSTEM; LATIGO STATION SHUT IN WAS TERMINATED 10:00, 01/07/2016;