PHMSA Report 20180060 - COLUMBIA GULF TRANSMISSION, LLC — Gas transmission and gathering — incident on 2018-05-18 | Regulus

Gas transmission and gathering incident in DELHI, RICHLAND County, LA. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3805 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: 20180060.

Operator ID: 2620.

Reported incident date: 5/18/2018 1:52.

Location detail: BLOWDOWN VLV

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ON MAY 18TH, 2018, DELHI COMPRESSOR STATION (CS) WAS SUBJECT TO AN UNINTENTIONAL RELEASE OF NATURAL GAS (MATERIAL) RESULTING IN MATERIAL LOSS EXCEEDING 3,000 MCF. DELHI IS A TRANSMISSION CS THAT IS MAINTAINED BY COLUMBIA GULF TRANSMISSION, LLC (TRANSCANADA) AND IS LOCATED IN RICHLAND PARISH, NEAR THE TOWN OF DELHI, LOUISIANA. AT APPROXIMATELY 02:07 CST TRANSCANADA'S MONITORING CENTER RECEIVED A NOTIFICATION FROM THE PUBLIC OF A POTENTIAL RELEASE OF MATERIAL AT DELHI CS. ONCE OPERATIONS PERSONNEL ARRIVED ON-SITE AT APPROXIMATELY 02:20 CST, THE UNINTENDED RELEASE OF MATERIAL WAS IDENTIFIED AND ISOLATED AT APPROXIMATELY AT 02:24 CST. THE MATERIAL LOSS CALCULATIONS WERE DETERMINED TO BE GREATER THAN 3,000 MCF, HENCE, THE EVENT WAS REPORTED TO THE NATIONAL RESPONSE CENTER (NRC). THE INVESTIGATION DETERMINED THAT GREASE AND DEBRIS IN THE SUPPLY/SENSING LINE AND FILTER SCREENS OF THE PILOT RELIEF VALVE CAUSED THE UNINTENTIONAL OPERATION OF THE RELIEF VALVE. A 48-HR. UPDATE WAS CALLED-IN TO THE NRC WHERE THE UPDATE REPORT NO. WAS 1212599.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $10,850 reported total cost, $9,903.738 in 1984 dollars, $12,455.222 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.