ANR PIPELINE CO

Incident Narrative

STATION ESD, CAUSED BY FIRE DETECTION ON UNIT 705. REASON FOR FIRE WAS FOUND TO BE A 3/8"" OIL LINE BROKEN ON # 11 POWER CYLINDER SPRAYING OIL ON EXHAUST HEADER. STATION DISCHARGE VALVE 34-48 DID NOT FULLY CLOSE. ALSO, STATION SUCTION VALVE 34-25 DID NOT FULLY CLOSE. THIS CAUSED GAS TO VENT OUT OF BLOWDOWN AND ESTIMATED 32.6 MMCF WAS RELEASED. EVENT SET OFF THE UV DETECTORS CAUSED BY FLASH FIRE. STATION DISCHARGE VALVE DID NOT CLOSE COMPLETELY AND INDICATORS MAY NOT BE ACCURATE FOR THIS VALVE POSITIONING IN THE OPEN POSITION. STEPS TAKEN TO RETURN TO NORMAL OPERATION: VERIFIED WHAT UNIT CAUSED THE ESD. BLOWDOWN VALVE F WAS CLOSED. THIS STOPPED THE VENTING OF THE GAS. BY-PASS 10 AND 20 WERE OPENED MANUALLY TO BYPASS THE STATION. YARD VALVES REPOSITIONED TO NORMAL IN THE STATION YARD. UNITS WERE VERIFIED FOR START SEQUENCE. UNIT 705 THAT CAUSED THE ESD, WAS REPAIRED AND STARTED AS WELL. THERE ARE TWO MAIN LINES COMING INTO THE STATION (24"" 100 AND 24 ""1-100) AND THREE MAIN LINES LEAVING THE STATION (24"" 100, 24"" 1-100, AND 30"" 2-100). VALVE 100-34-10, STATION BY-PASS VALVE (MAIN LINE VALVE) ON 100 LINE WILL OPEN WITH SIGNAL FROM STATION PROCESSOR BASED PRESSURE DIFFERENTIAL ACROSS VALVE VALVE 100-34-20, STATION BY-PASS VALVE (MAIN LINE VALVE) ON 1-100 LINE WILL OPEN WITH SIGNAL FROM STATION PROCESSOR BASED PRESSURE DIFFERENTIAL ACROSS VALVE VALVE 100-34-E, SUCTION VENT VALVE WILL OPEN ON LOSS OF PILOT PRESSURE VALVE 100-34-F, SUCTION VENT VALVE WILL OPEN ON LOSS OF PILOT PRESSURE VALVE 100-34-15, SUCTION BLOCK VALVE OFF OF 100 LINE WILL CLOSE ON LOSS OF PILOT PRESSURE VALVE 100-34-25, SUCTION BLOCK VALVE OFF OF 1-100 LINE WILL CLOSE ON LOSS OF PILOT PRESSURE VALVE 100-34-16, DISCHARGE BLOCK VALVE OFF OF 100 LINE WILL CLOSE ON LOSS OF PILOT PRESSURE VALVE 100-34-26, DISCHARGE BLOCK VALVE OFF OF 1-100 LINE WILL CLOSE ON LOSS OF PILOT PRESSURE VALVE 100-34-48, DISCHARGE BLOCK VALVE OFF OF 2-100 LINE WILL CLOSE ON LOSS OF PILOT PRESSURE