ANR PIPELINE CO — Gas transmission and gathering — incident on 2014-02-18

Gas transmission and gathering incident. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 2500 NATURAL GAS released, $100,000 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: 20140030.

Operator ID: 405.

Reported incident date: 2/18/2014 16:30.

Cause detail: THREADED CONNECTION/COUPLING FAILURE

Cause detail: A LEAK WAS DISCOVERED AT SOUTH MARSH ISLAND BLOCK 287 AS WORK WAS BEGINNING ON THE REPAIR OF A LEAK AT EUGENE ISLAND BLOCK 115. THE LEAK WAS APPARENTLY FOUND NEAR A SUB-SEA AUXILIARY VALVE ON ANR LINE 747. IT WAS TRACED BY A DIVING CREW TO A GREASE FITTING ON THE VALVE. FOLLOWING THE INVESTIGATION, THE REPAIR OF THE VALVE ASSEMBLY WAS PLANNED; THE DE-PRESSURIZATION OF THE PIPELINE WAS CONDUCTED BY VENTING THE GAS FROM THE SMI BLOCK 10 PLATFORM. THE VENTING BEGAN WITH 849 PSIG. ONCE THE PRESSURE ON THE LINE REACHED 23 PSIG., THE LEAKING FITTING ON THE VALVE WAS REPLACED. THE REPAIR WAS COMPLETED ON 2-22-14.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — THREADED CONNECTION/COUPLING FAILURE.

PHMSA indexed costs: $170,000 reported total cost, $95,478.615 in 1984 dollars, $192,423.109 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.