ANR PIPELINE CO — Gas transmission and gathering — incident on 2016-09-07

Gas transmission and gathering incident in Not Within a Municipality, CUSTER County, OK. Reported cause: OTHER OUTSIDE FORCE DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 1847 NATURAL GAS released, $93,995 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: 20160082.

Operator ID: 405.

Reported incident date: 9/7/2016 12:50.

Location detail: MP 0.00

Cause detail: DAMAGE BY CAR, TRUCK, OR OTHER MOTORIZED VEHICLE/EQUIPMENT NOT ENGAGED IN EXCAVATION

Cause detail: AFTER RUNNING OVER A PIPE GUARD AND A HIGH-HEAD VALVE EXTENSION WITH CULTIVATING EQUIPMENT, THE PROPERTY OWNER CALLED TRANSCANADA GAS CONTROL TO REPORT LEAKING GAS AT 12:50 CT ON SEPTEMBER 7, 2016. FIELD PERSONNEL WERE DISPATCHED TO INVESTIGATE. IT WAS CONFIRMED THAT THE AFFECTED FACILITIES WERE ON ANR'S 496-0601 TAP TO THE 496-1601 LINE. THE 6" SIDE VALVE ASSEMBLY WAS WHAT REMAINED OF THE 496-0601 LATERAL THAT WAS ABANDONED IN 1998. VALVES ON THE 496-1601 LINE ON EACH OF THE TAP WERE USED TO ISOLATE AND BLOW DOWN THE LEAKING FACILITY. IT WAS DETERMINED AFTER BLOWING DOWN THIS SEGMENT THAT THE EQUIPMENT STRIKE CAUSED A 1/2-INCH BODY BLEED ON THE6" SIDE VALVE TO BREAK AND LEAK. NECESSARY REPAIRS WERE MADE AND THE FACILITY WAS RETURNED TO SERVICE ON SEPTEMBER 19, 2016. THERE WAS NOT IGNITION OF THE LEAKING GAS. THERE WAS NO EVIDENCE OF LIQUID HYDROCARBONS FROM THE LEAK. THERE WERE NO INJURIES. AS A PRECAUTION THE CLOSEST RESIDENTS WERE ASKED TO NOT RETURN TO THEIR HOMES UNTIL THE BLOWDOWN WAS COMPLETED AND THE FACILITY WAS MADE SAFE. THE CLOSEST OF THE TWO RESIDENCES WAS 300 FEET FROM THE LOCATION OF THE LEAK, SIGNIFICANTLY OUTSIDE THE PIR OF 135 FEET.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: OTHER OUTSIDE FORCE DAMAGE — VEHICLE NOT ENGAGED IN EXCAVATION.

PHMSA indexed costs: $134,545 reported total cost, $72,694.043 in 1984 dollars, $165,689.102 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.