TRANSCONTINENTAL GAS PIPE LINE COMPANY — Gas transmission and gathering — incident on 2018-07-02

Gas transmission and gathering incident in MOORE, SPARTANBURG County, SC. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 0.325 NATURAL GAS released, $164,000 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: 20180084.

Operator ID: 19570.

Reported incident date: 7/2/2018 23:43.

Location detail: 1205.89

Cause detail: DESIGN-, CONSTRUCTION-, INSTALLATION-, OR FABRICATION-RELATED

Cause detail: PLEASE REFERENCE THE ORIGINAL REPORT NO. 20180084-30821 FOR THE INITIAL INCIDENT REPORT INFORMATION. A BRIEF SUMMARY IS NOTED BELOW. ON JULY 2, 2018 AT APPROXIMATELY 10:00 PM (22:00), OPERATION TECHNICIAN WAS CALLED OUT TO STATION 140 ON REPORT OF MAIN UNITS (MUS) 14 AND 15 FALLING OFFLINE. UPON ARRIVAL AT APPROXIMATELY 10:30 PM (22:30), TECHNICIAN REVIEWED ALARM LOGS IN CONTROL ROOM, AND INSPECTED MUS 14 AND 15, AND IDENTIFIED A CRACK ON THE MU 14 DISCHARGE HEADER AT THE 4' BLOWDOWN PIPING CONNECTION. IDENTIFIED AT APPROXIMATELY 11:43 PM (23:43). OPERATION TECHNICIAN CONTACTED OPERATIONS MANAGER TO NOTIFY OF LEAK, CONTACTED PIPELINE CONTROL, AND CONTACTED ADDITIONAL TECHNICIANS TO COME HELP ISOLATE AND BLOWDOWN MU 14 PIPING. UPON ARRIVAL OF BACKUP SUPPORT, PROCEEDED TO ISOLATE MU 14 AND PERFORM REMOTE ESD OF MU 14 PIPING. (APPROXIMATELY 1:45AM (01:45) ON JULY 3) REPAIR OPTIONS WERE DETERMINED TO EXCEED $50,000 ON JULY 19, 2018 AND SECURITY OPERATIONS CENTER (SOC) WAS INSTRUCTED TO CONTACT THE NRC FOR A DOT REPORTABLE INCIDENT. THE FIRST INITIAL NRC REPORT# 1218827 ON JULY 19 WAS IN ERROR (REPORTED INCIDENT AS 'FIXED'). PHMSA REQUESTED TO CORRECT THE REPORT TO INCIDENT AS 'PIPELINE' UNDER NRC REPORT# 1218832. A 48-HOUR UPDATE WAS SUBMITTED UNDER NRC REPORT# 1219242 ON JULY 23, 2018. ON AUGUST 21, 2018, PHMSA REQUESTED CORRECTIONS TO THE INITIAL INCIDENT REPORT AND ARE REFLECTED ON THIS FINAL INCIDENT REPORT. A STATION OUTAGE WAS REQUIRED TO REPAIR THE DISCHARGE HEADER AND SAFELY INSTALL THE NEW REPLACEMENT TEE. THE REPAIR WAS COMPLETED, AND MU 14 WAS RETURNED TO SERVICE ON SEPTEMBER 6, 2018 AT APPROXIMATELY 9:00 PM EST (21:00). THE FINAL INFORMATION WAS GATHERED AND VERIFIED, AND THIS FINAL INCIDENT REPORT WAS SUBMITTED ON DECEMBER 13, 2018

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: MATERIAL FAILURE OF PIPE OR WELD — CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED.

PHMSA indexed costs: $165,287 reported total cost, $79,086.704 in 1984 dollars, $194,435.27 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.