COLUMBIA GAS TRANSMISSION, LLC — Gas transmission and gathering — incident on 2019-01-20

Gas transmission and gathering incident in ELKVIEW, KANAWHA County, WV. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 5129 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: 20190009.

Operator ID: 2616.

Reported incident date: 1/20/2019 4:10.

Location detail: 00+00

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ON 01/20/2019, AN 8" RELIEF VALVE AT COCO COMPRESSOR STATION UNINTENTIONALLY ACTIVATED AND RELEASED A REPORTABLE QUANTITY (5,129 MCF) OF NATURAL GAS TO THE ATMOSPHERE. THE RELIEF VALVE IS LOCATED ON THE 36" SUCTION HEADER OF THE STATION AND ACTS AS A TERTIARY OVERPRESSURE-PRESSURE PROTECTION (OPP) DEVICE. THE FIRST AND SECOND OPP DEVICES DID NOT ACTIVATE. THE CAUSE OF THE RELEASE WAS INVESTIGATED. ICE BUILD-UP IN THE PRESSURE SENSING LINES (PILOT)CREATED A DIFFERENTIAL IN PRESSURE CAUSING THE RELIEF VALVE TO OPEN. NO FIRE, EXPLOSION, DEATHS, INJURIES OR EVACUATIONS OCCURRED AS A RESULT OF THE RELEASE.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $17,439 reported total cost, $18,079.803 in 1984 dollars, $22,199.252 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.