PHMSA Report 20130051 - OKLAHOMA NATURAL GAS CO — Gas transmission and gathering — incident on 2013-05-20 | Regulus

Gas transmission and gathering incident in NEWCASTLE, MCCLAIN County, OK. Reported cause: NATURAL FORCE DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 29 released, $2,334,770 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: 20130051.

Operator ID: 14210.

Reported incident date: 5/20/2013 14:56.

Cause detail: OTHER NATURAL FORCE DAMAGE

Cause detail: THE PIPELINE SYSTEM (LINE-F) CONSISTED OF A 20" LINE (SOUTH OF THE BRIDGE) THAT SPLIT INTO TWO LINES (12" AND 16" TRAVERSING THE BRIDGE) AND COMBINED INTO A 24" LINE (NORTH OF THE BRIDGE). THE EF5 TORNADO DAMAGED THE TRESTLE BRIDGE AND CAUSED BOTH LINES TO BE DISLODGED FROM THEIR SUSPENSION ON THE BRIDGE. A 1" NIPPLE WAS BROKEN OFF OF THE 16" LINE, WHEN BOTH LINES FELL ONTO RIVERBED, WHICH CAUSED AN INITIAL UNINTENTIONAL RELEASE. A CONTROLLED RELEASE OCCURRED AFTERWARDS WHEN VALVES ON EITHER END OF THE PIPELINE SECTION OVER THE RIVER WERE CLOSED. BOTH LINES WERE REMOVED FROM SERVICE AND WERE REPLACED BY A SINGLE 24" LINE BORED UNDER THE RIVER. THE INITIAL REPORTING OF THE EVENT WAS DELAYED DUE TO CELLULAR AND VEHICULAR CONGESTION, AS WELL AS AN ADDITIONAL PIPELINE SUPPORTED AT THE BRIDGE BY ANOTHER OPERATOR, WHICH DELAYED COMMUNICATION AND CONFIRMATION OF THE EVENT. THIS SUPPLEMENTAL IS BEING SUBMITTED TO CORRECT THE REPORT TYPE DESIGNATION AS "FINAL". NO OTHER CHANGES WERE MADE OR ARE NECESSARY TO THE PREVIOUS SUBMITTAL.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: NATURAL FORCE DAMAGE — OTHER NATURAL FORCE DAMAGE.

PHMSA indexed costs: $2,339,727 reported total cost, $1,210,905.689 in 1984 dollars, $2,979,632.229 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.