ANR PIPELINE CO — Gas transmission and gathering — incident on 2012-02-12

Gas transmission and gathering incident in LINEVILLE, WAYNE County, IA. Reported cause: INCORRECT OPERATION. Reported consequences: 0 fatalities, 0 injuries, 21000 NATURAL GAS released, $20,000 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: 20120027.

Operator ID: 405.

Reported incident date: 2/12/2012 16:15.

Location detail: 35

Cause detail: OTHER INCORRECT OPERATION

Cause detail: ANR SOUTHWEST LINEVILLE IA COMPRESSOR STATION EXPERIENCED AN ESD EVENT AT 16:42 CST ON FEBRUARY 12. 2012. THE INITIAL CAUSE OF THE ESD IS BELIEVED TO BE A FAILED COPPER TUBING OIL LINE, UNIT 705 THAT CAUSED A FLASH FIRE. THE FIRE DETECTION RESULTED IN THE ESD OF THE COMPRESSOR STATION. DURING THE ISOLATION AND BLOW-DOWN IT WAS DISCOVERED THAT ONE OF THE STATION ISOLATION VALVES DID NOT TRAVEL TO ITS DESIRED ISOLATION POSITION RESULTING IN A REPORTABLE GAS RELEASE. ALSO, IT WAS DISCOVERED THAT THE VALVE ACTUATOR WAS NOT MOUNTED ON THE VALVE IN THE CORRECT POSITION AND THAT CAUSED THE VALVE TO MALFUNCTION. THE VENTING OF GAS WAS STOPPED BY FIELD PERSONNEL AT APPROXIMATELY 17:36. INITIAL CALCULATIONS ESTIMATE APPROXIMATELY 21 MILLION CUBIC FEET OF GAS LOSS.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: INCORRECT OPERATION — OTHER INCORRECT OPERATION.

PHMSA indexed costs: $150,000 reported total cost, $116,012.416 in 1984 dollars, $161,957.397 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.