ENOGEX LLC — Gas transmission and gathering — incident on 2013-06-29

Gas transmission and gathering incident in KINTA, HASKELL County, OK. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 18950 NATURAL GAS released, $32,853 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: 20130071.

Operator ID: 26330.

Reported incident date: 6/29/2013 9:00.

Cause detail: INTERNAL CORROSION

Cause detail: ON THE MORNING OF JUNE 29TH, LOCAL LAND OWNERS NOTIFIED HIGHLAND TO REPORT A POSSIBLE LINE RUPTURE SOUTH OF THE HIGHLAND KINTA YARD. HIGHLAND THEN CONTACTED ENOGEX. ENOGEX RESPONDED TO THE REPORT AND DROVE TO THE SITE FOR CONFIRMATION. AFTER CONFIRMING THE RUPTURE, ENOGEX CLOSED THE UPSTREAM VALVE AT ROBBERS CAVE JUNCTION, AND PROCEEDED TO THE KINTA YARD TO CLOSE THE DOWNSTREAM VALVE ON L-111, AND AT THIS POINT WAS ABLE TO CONFIRM THE RUPTURE. AFTER THE LINE WAS BLOWN DOWN, ENOGEX EVALUATED THE PIPELINE AND IT WAS DETERMINED THAT THE RUPTURE WAS ON AN INACTIVE 4" LATERAL (ARCO SNOW LATERAL) THAT TIES INTO L-111. AT THE TIME OF THE RUPTURE THE LATERAL WAS CAPPED AND INACTIVE. SINCE THE RUPTURE OCCURRED IN AN AREA BETWEEN L-111 AND THE BLIND INSTALLED ON THE ARCO LATERAL, L-111 TRANSMISSION GAS WAS VENTING THROUGH THE RUPTURE ON THE LATERAL. THE DECISION WAS MADE TO REMOVE 44' OF L-111 PIPE, INCLUDING THE ARCO TIE IN, AND REPLACING IT WITH 44' OF NEW PIPE. LINE 111 WAS REPAIRED AND PLACED BACK INTO SERVICE ON 7/2/13.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $86,457 reported total cost, $58,043.659 in 1984 dollars, $97,361.776 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.