TRANSCONTINENTAL GAS PIPE LINE COMPANY — Gas transmission and gathering — incident on 2019-03-24

Gas transmission and gathering incident. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 336 NATURAL GAS released, $36,000 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: 20190050.

Operator ID: 19570.

Reported incident date: 3/24/2019 10:30.

Cause detail: INTERNAL CORROSION

Cause detail: WILLIAMS OPERATIONS RECEIVED A CALL ABOUT A SHEEN AND BUBBLES ONE MILE FROM THE SHIP SHOAL 229 PLATFORM. BOTH WILLIAMS AND ANCHOR SHUT-IN PRODUCTION AT SHIP SHOAL 229 & 243. WILLIAMS OPERATIONS SUPERVISOR AND TECHNICIAN FLEW OFFSHORE AND PLOTTED THE COORDINATES OF THE SHEEN TO BE LESS THAN 100 FT FROM OUR LINE. O'BRIENS WAS NOTIFIED AND PRODUCERS WERE SHUT IN ON 3/24/3019. WILLIAMS CONTACTED CHET MORRISON DIVERS TO REQUEST THEIR SERVICE FOR THE LEAK INVESTIGATION AND PETROQUIP TO INQUIRE ABOUT A 20" REPAIR CLAMP. DIVERS CONFIRMED THE LEAK ON 3/25/19 COMING FROM THE WILLIAMS 20" PIPELINE SEGMENT #1636 AND WAS FOUND AT THE 4 O CLOCK POSITION. ADDITIONAL NOTIFICATIONS OF THE CONFIRMED LEAK WERE MADE BY WITT O' BRIEN'S. WORK BEGAN TO REMOVE CONCRETE AND CLEARING AREA FOR REPAIR WORK. ON 3/26/2019, DIVERS REPORTED ALL CONCRETE REMOVED AND COMPLETED THE REPAIR CLAMP INSTALLATION ON 3/27/2019. LINE PRESSURE WAS RETURNED ON 3/28/19 AND NO LEAKS WERE DISCOVERED.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $352,503 reported total cost, $185,338.753 in 1984 dollars, $410,980.692 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.