ANR PIPELINE CO — Gas transmission and gathering — incident on 2012-04-25

Gas transmission and gathering incident in SHEBOYGAN County, WI. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 31000 NATURAL GAS released, $2,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20120054.

Operator ID: 405.

Reported incident date: 4/25/2012 5:30.

Location detail: MLV 6-3A-2

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: THE KEWASKUM COMPRESSOR STATION LOCATED NEAR BEECHWOOD WISCONSIN EXPERIENCED A STATION ESD. THE STATION DID NOT BLOW DOWN AS REQUIRED. VALVE 350-15-26 STOPPED 3/4 CLOSED. THE VALVE CYCLED NUMEROUS TIMES AS THE ESD SIGNAL AND THE STATION SIGNAL WERE CYCLING. THE VALVE FINALLY STOPPED AT WITHOUT CLOSING COMPLETELY. THE VALVE MALFUNCTIONED BECAUSE A FUSE IN THE 24 VOLT DC RELAY SYSTEM PARTIALLY FAILED. TECHNICIANS AND MANAGER REPORTED TO THE STATION AND PROCEEDED TO ISOLATE THE STATION. SUBSEQUENTLY, STATION TECHNICIANS REPAIRED THE TERMINAL FUSE BLOCKS AND REPLACED WIRING IN THE CONTROL ROOM. INVESTIGATION OF THE MALFUNCTION WAS COMPLETED.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — MALFUNCTION OF CONTROL/RELIEF EQUIPMENT.

PHMSA indexed costs: $127,000 reported total cost, $105,131.897 in 1984 dollars, $131,037.177 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.