COLUMBIA GULF TRANSMISSION CO — Gas transmission and gathering — incident on 2013-12-12

Gas transmission and gathering incident in CORINTH, ALCORN County, MS. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 4320 NATURAL GAS released, $250 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: 20140004.

Operator ID: 2620.

Reported incident date: 12/12/2013 13:49.

Location detail: 5SH-2U

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ON DECEMBER 12, 2013, A COLUMBIA GULF TRANSMISSION, LLC (COLUMBIA) COMPRESSOR STATION (CS) WAS SUBJECT TO AN UNINTENDED EMERGENCY SHUTDOWN (ESD). THIS ESD EVENT TOOK PLACE AT COLUMBIAS CORINTH CS WHICH IS LOCATED IN ALCORN COUNTY, NEAR THE CITY OF CORINTH, MISSISSIPPI. AN OUTPUT BLOCK CONTROLLER FOR THE ISOLATION VALVE FAILED ON THE ESD SYSTEM WHICH LED TO THE CONTINUED FLOW OF NATURAL GAS TO THE ISOLATION BLOW-OFF VALVE THAT EXCEEDED 3,000 MCF (4,320 MCF). AFTER A THOROUGH INVESTIGATION, THIS OUTPUT BLOCK CONTROLLER WAS FOUND FAULTY AND WAS REPLACED. FULL FUNCTIONAL CHECK AND TEST WERE PERFORMED TO THE REPLACED COMPONENTS BEFORE RETURNING THE ESD SYSTEM AND THE CS BACK TO NORMAL SERVICE.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $17,308 reported total cost, $13,936.501 in 1984 dollars, $17,271.583 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.