ONEOK WESTEX TRANSMISSION, LLC — Gas transmission and gathering — incident on 2015-10-01

Gas transmission and gathering incident in Not Within a Municipality, MARTIN County, TX. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3624 NATURAL GAS released, $200,000 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: 20150129.

Operator ID: 31531.

Reported incident date: 10/1/2015 15:05.

Location detail: 54.00

Cause detail: EXTERNAL CORROSION

Cause detail: ON OCTOBER 1, 2015, THE OPERATING PRESSURE ON PARALLEL LINES 800-000 AND 801-000 APPEARED TO THE CONTROL ROOM OPERATORS TO BE LOWER THAN EXPECTED. FIELD OPERATIONS PERSONNEL CONFIRMED GAS VENTING TO ATMOSPHERE ON LINE 800-000. THE PIPELINE IS IN A LOW WET AREA THAT HAS PREVENTED CLOSE EXAMINATION OF THE FAILURE BEYOND A SINGLE PHOTOGRAPH OF THE PIPE BEFORE BEING COVERED BY GROUND WATER. LINE 800-000 WILL REMAIN OUT OF SERVICE UNTIL A REPAIR METHOD HAS BEEN DETERMINED. LINE 801-000 WILL REMAIN IN SERVICE. SUPPLEMENTAL - THE FAILURE SITE BECAME ACCESSIBLE AND THE PIPELINE WAS REPAIRED BY INSTALLING A CYLINDER OF TESTED PIPE. EXTERNAL CORROSION WAS CONFIRMED TO BE THE CAUSE OF THE FAILURE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — EXTERNAL.

PHMSA indexed costs: $212,576 reported total cost, $111,568.647 in 1984 dollars, $261,504.899 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.