TRANSCONTINENTAL GAS PIPE LINE COMPANY — Gas transmission and gathering — incident on 2017-09-25

Gas transmission and gathering incident. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 115 NATURAL GAS released, $17,236 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: 20170096.

Operator ID: 19570.

Reported incident date: 9/25/2017 15:46.

Cause detail: INTERNAL CORROSION

Cause detail: 9/25/2017 A THIRD PARTY HELICOPTER SPOTTED THE BUBBLES AND REPORTED THEM TO WGP PIPELINE CONTROL. PIPELINE CONTROL NOTIFIED WGP OPERATIONS. OPERATIONS FLEW OUT TO VERIFY COORDINATES. THE BUBBLES WERE IN THE VICINITY OF A WGP 16' PIPELINE. THE WILLIAMS SECURITY OPERATIONS CENTER WAS NOTIFIED OF THE POTENTIAL LEAK. THE 16' SECTION OF PIPELINE WAS ISOLATED AND PRODUCTION WAS SHUT IN. 9/26/2017 THE PRESSURE WAS REDUCED IN THAT SECTION OF 16'. DIVE BOAT WAS DISPATCHED AND DIVERS CONFIRMED THE LEAK WAS THE WGP 16' PIPELINE. THE SOC WAS NOTIFIED OF A CONFIRMED LEAK AND THEY NOTIFIED THE NRC. 9/27/2017 WGP OPERATIONS ACQUIRED A 16' PLIDCO CLAMP THAT WAS INSTALLED THE NEXT DAY. 9/29/2017 PIPELINE WAS PRESSURIZED TO CHECK FOR LEAKS. NO LEAKS WERE FOUND. THE SECTION OF WGP16' PIPELINE WAS RETURNED TO SERVICE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $142,164 reported total cost, $72,925.293 in 1984 dollars, $170,855.022 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.