ENTERPRISE PRODUCTS OPERATING LLC — Gas transmission and gathering — incident on 2014-09-01

Gas transmission and gathering incident in WEBSTER, HARRIS County, TX. Reported cause: INCORRECT OPERATION. Reported consequences: 0 fatalities, 0 injuries, 18645 NATURAL GAS released, $0 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: 20140102.

Operator ID: 31618.

Reported incident date: 9/1/2014 11:50.

Cause detail: VALVE LEFT OR PLACED IN WRONG POSITION, BUT NOT RESULTING IN AN OVERPRESSURE

Cause detail: ON 9/1/2014, TWO INSTRUMENT AIR COMPRESSORS SHUT DOWN CAUSING A LOW-LOW INSTRUMENT AIR SIGNAL; AS A RESULT, THE EMERGENCY SHUTDOWN (ESD) WAS INITIATED. AN ENTERPRISE EMPLOYEE DISCOVERED THE INCIDENT AND IDENTIFIED THAT A 2" BYPASS VALVE AROUND THE ESD ISOLATION VALVE WAS INADVERTENTLY LEFT PARTIALLY OPEN, THUS ALLOWING GAS TO BYPASS THE ISOLATION VALVE AND VENT GAS TO THE ATMOSPHERE. OPERATIONS PERSONNEL CLOSED THE VALVE TO END THE EVENT. INVESTIGATION IDENTIFIED THAT THE ESD SIGNAL DID NOT ALARM IN THE CONTROL ROOM; THE SIGNAL WAS CONFIGURED TO ALARM IN THE CONTROL ROOM AND POINT-TO-POINT VERIFICATIONS WERE COMPLETED.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: INCORRECT OPERATION — INCORRECT VALVE POSITION.

PHMSA indexed costs: $73,436 reported total cost, $50,800.736 in 1984 dollars, $62,375.587 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.