TRANSCOLORADO GAS TRANSMISSION COMPANY LLC — Gas transmission and gathering — incident on 2017-07-28

Gas transmission and gathering incident in BLOOMFIELD, SAN JUAN County, NM. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 27410 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: 20170072.

Operator ID: 19580.

Reported incident date: 7/28/2017 19:11.

Location detail: BLANCO CS

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: BASED ON STATION PRESSURE AND FLOW TRENDS IT HAS BEEN DETERMINED THE 2" STATION DISCHARGE VENT VALVE MOST LIKELY OPENED DURING A POWER OUTAGE OCCURRING AT 7:23 PM ON 7/28/2017. ON SATURDAY MORNING 07/29/2017 A COMPANY EMPLOYEE WAS DRIVING BY THE TCGT BLANCO COMPRESSOR STATION ON HIS REGULAR DAY OFF. THE EMPLOYEE NOTICED WHAT LOOKED LIKE GAS VAPOR VENTING FROM THE STATION BLOWDOWN SILENCER. THE EMPLOYEE DROVE UP TO THE STATION AND VERIFIED GAS WAS VENTING FROM THE BLOWDOWN SILENCER. EMPLOYEE CALLED OPERATIONS MANAGER AT 7:11 AM LOCAL TIME TO REPORT THE ISSUE. OPERATIONS MANAGER CALLED OUT LOCAL E&C TECHNICIAN TO RESPOND TO THE FACILITY. E&C TECHNICIAN ARRIVED ON SITE AT 7:36 AM LOCAL TIME AND DISCOVERED 2" STATION DISCHARGE VENT VALVE WAS OPEN. DISCHARGE VENT VALVE CLOSED AT 7:37 AND STOPPED VENTING OF GAS.

PHMSA trend classification: significant incident, not serious.

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

PHMSA indexed costs: $75,267 reported total cost, $71,329.253 in 1984 dollars, $87,762.572 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.