ONEOK WESTEX TRANSMISSION, LLC — Gas transmission and gathering — incident on 2015-10-21

Gas transmission and gathering incident in Not Within a Municipality, REEVES County, TX. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 48641 NATURAL GAS released, $142,500 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: 20150138.

Operator ID: 31531.

Reported incident date: 10/21/2015 8:55.

Location detail: MP 53.52

Cause detail: EXTERNAL CORROSION

Cause detail: AT 2:32 AM ON OCT 21, PIPELINE CONTROL OPERATORS NOTICED A PRESSURE DROP ON LINE 4001-000. THE CONTROL OPERATOR NOTIFIED FIELD OPERATIONS PERSONNEL. SEVERAL MAINLINE VALVES WERE CLOSED TO DETERMINE WHICH SECTION OF THE LINE MIGHT BE LEAKING. WHEN THE LEAKING SEGMENT WAS IDENTIFIED, FIELD OPERATIONS PERSONNEL BEGAN FOLLOWING THE PIPELINE TO DETERMINE THE LOCATION OF THE LEAK. AT 8:55 AM THE LOCATION OF THE LEAK WAS IDENTIFIED. APPROXIMATELY 100 FEET OF LINE HAD RUPTURED AND WAS PARTIALLY EJECTED FROM THE DITCH. AT THIS TIME EXTERNAL CORROSION IS THE SUSPECTED CAUSE BASED ON FIELD EXAMINATION ON OCT 21. THE FAILURE PIECES HAVE BEEN SENT TO A THIRD PARTY LAB FOR EXAMINATION. A SUPPLEMENTAL REPORT WILL BE FILED IF THE ROOT CAUSE IS DETERMINED TO BE SOMETHING OTHER THAN EXTERNAL CORROSION. SUPPLEMENTAL - THE LAB REPORT CONFIRMED EXTERNAL CORROSION AS THE CAUSE OF THE FAILURE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — EXTERNAL.

PHMSA indexed costs: $262,237 reported total cost, $182,085.704 in 1984 dollars, $312,469.014 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.