TRANSCONTINENTAL GAS PIPE LINE COMPANY — Gas transmission and gathering — incident on 2017-09-13

Gas transmission and gathering incident. Reported cause: OTHER OUTSIDE FORCE DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 100 NATURAL GAS released, $50,000 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: 20170091.

Operator ID: 19570.

Reported incident date: 9/13/2017 10:13.

Cause detail: ROUTINE OR NORMAL FISHING OR OTHER MARITIME ACTIVITY NOT ENGAGED IN EXCAVATION

Cause detail: 9/13/2017 FIELDWOOD CONTRACT PERSONNEL WERE PERFORMING MAINTENANCE ON THE SUBSEA VALVE ASSEMBLY IN THIS LOCATION AND NOTICED THAT THERE WAS AN ABANDONED COMMERCIAL FISHING NET CAUGHT UP ON THE ASSEMBLY. THE DIVERS WORKING FOR FIELDWOOD REMOVED THE TRAUL BOARDS AND CHAINS AND DISCOVERED BUBBLES FROM A SMALL PINHOLE LEAK ON THE TRANSCO 16 INCH SPOOL PIECE. A BOLT ON CLAMP WAS LOCATED AND IMMEDIATELY SENT TO THE LOCATION. THE DIVE TEAM FROM FIELDWOOD INSTALLED THE CLAMP WHICH SUCCESSFULLY STOPPED THE LEAK. 10/18/2017 UPON FURTHER REVIEW OF DIVER LOGS. THE EXACT TIME THAT THE LEAK WAS DISCOVERED HAS BEEN UPDATED TO SHOW 10:13 AM. DIVERS ALSO REPORTED ON THE LOG THAT AFTER REMOVAL OF CHAINS FROM THE SHRIMP NETS, THEY COULD SEE AN AREA WHERE THE CHAINS HAD RUBBED AND REMOVED SOME OF THE METAL WALL OF THE PIPE BODY. THE AREA THAT HAD BEEN RUBBED WAS OBSERVED TO BE ROUGHLY 1 INCH LONG BY 3/4 INCH WIDE WITH A PINHOLE LEAK IN THE MIDDLE.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: OTHER OUTSIDE FORCE DAMAGE — FISHING OR MARITIME ACTIVITY.

PHMSA indexed costs: $55,329 reported total cost, $27,197.311 in 1984 dollars, $66,592.85 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.