TRANSCONTINENTAL GAS PIPE LINE COMPANY — Gas transmission and gathering — incident on 2017-06-30

Gas transmission and gathering incident in LA. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 218 NATURAL GAS released, $300,000 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: 20170064.

Operator ID: 19570.

Reported incident date: 6/30/2017 15:35.

Cause detail: INTERNAL CORROSION

Cause detail: B.S.E.E. REPORTED BUBBLES IN THE VACITNITY OF VERMILION AREA (VA) BLOCKS 101 AND 81 LATE AFTERNOON ON 6/30/17. OPERATIONS MADE THE INTIAL FLIGHT OVER THE AREA AND THEN CLOSED THE TOPSIDE BLOCK VALVE AT THE VA-66 PLATFORM AND THE TOPSIDE BLOCK VALVE A THE VA-78 PLATFORM. A SECOND FLIGHT WAS MADE THE NEXT MORNING ON 7/1/17 AND BUBBLES WERE STILL PRESENT ALONG WITH A PRESSURE DROP ON THE SHUT IN PIPELINE. A DIVE BOAT WAS SECURED WITH PERSONNEL, TOOLS, AND A TEMPORARY BOLT ON LEAK CLAMP. DIVE BOAT AND PERSONNEL ARRIVED ON LOCATION AT VA-82 BUBBLES AT 22:15 ON 7/2/17. PIPE LEAK LOCATED BY DIVER AT 01:35 ON 7/3/17; COATING WAS REMOVED AND LEAK WAS MARKED WITH A BOUY. SUBSEA TIE-IN ASSEMBLY BALL VALVE WAS LOCATED IN VA-81 DOWNSTREAM OF THE LEAK AND CLOSED AT 07:07 ON 7/4/17. BOLT ON LEAK CLAMP WAS INSTALLED IN VA-82 AND LEAK STOPPED AT 18:45 ON 7/4/17. VA-66 AND VA-78 PLATFORM VAVLES WERE OPENED AT 10:00 ON 7/5/17.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $300,660 reported total cost, $147,271.694 in 1984 dollars, $361,911.002 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.