TENNESSEE GAS PIPELINE COMPANY — Gas transmission and gathering — incident on 2013-08-22

Gas transmission and gathering incident. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 2241 NATURAL GAS released, $454,810 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: 20130087.

Operator ID: 19160.

Reported incident date: 8/22/2013 16:20.

Cause detail: INTERNAL CORROSION

Cause detail: A REPORT OF BUBBLES AND RAINBOW SHEEN NEAR VERMILION BLOCK 241 WAS REPORTED TO TGP ON 8/22/2013 AT APPROXIMATELY 4:20PM. A HELICOPTER AND BOAT WERE IMMEDIATELY DISPATCHED TO DETERMINE IF THE LOCATION OF THE REPORTED LEAK WAS NEAR TGP PIPELINES IN THE AREA. CONFIRMATION WAS MADE AT 5:45PM (8/22) BY TGP PERSONNEL. THERE WAS NO SHEEN OBSERVED DURING THE INITIAL CONFIRMATION FLIGHT, AND BUBBLES WERE 20' TO 20' DIAMETER. THE PRODUCER, LOCATED IN VERMILION BLOCK 261 WAS SHUT IN. ON 8/23/2013, A CONTRACT VESSEL WAS MOBILIZED FOR LEAK REPAIR. TGP PERSONNEL WORKED WITH DIVE BOAT PERSONNEL TO DETERMINE WHETHER THE LEAK IS ON A 12" LINE OR AN ADJACENT 20" LINE, IN ORDER TO INITIATE REPAIRS. THE DEPTH OF THIS PIPE IS APPROXIMATELY 130'. THE LEAKING PIPELINE WAS IDENTIFIED AS TGP'S 20" NATURAL GAS LINE (509A-1100) IN VERMILION BLK 241. THE LINE WAS REPAIRED WITH A 20" CLAMP AND WAS RETURNED TO SERVICE AT APPROXIMATELY 2:30 PM ON 8/28/2013.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $462,497 reported total cost, $241,465.531 in 1984 dollars, $586,972.014 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.