TRANSCONTINENTAL GAS PIPE LINE COMPANY — Gas transmission and gathering — incident on 2017-09-15

Gas transmission and gathering incident in GROVER, CLEVELAND County, NC. Reported cause: INCORRECT OPERATION. Reported consequences: 0 fatalities, 0 injuries, 0 released, $0 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: 20170088.

Operator ID: 19570.

Reported incident date: 9/15/2017 12:00.

Location detail: 1247.08

Cause detail: OTHER INCORRECT OPERATION

Cause detail: COMPRESSOR STATION SIDE GATE VALVE 145-S6 AND ASSOCIATED PIPING WAS BEING CUT OUT AND REPLACED AS PART OF THE ATLANTIC SUNRISE FLOW REVERSAL PROJECT AT STATION 145. DURING THE TIE IN WELDING ACTIVITIES ON THE STATION SIDE OF THE NEW VALVE, AN ACCIDENTAL IGNITION EVENT OCCURRED CAUSING A PRESSURE WAVE TO TRAVEL THROUGH THE SUBJECT PIPING AND EXIT THROUGH THE AIR MOVER AND 8 INCH ISOLATION BAG PORT NEAR SIDE GATE VALVE 145-S8. IT WAS DETERMINED THAT THE GAS HANDLING PROCEDURE THAT WAS CREATED FOR THIS PROJECT WAS NOT SUFFICIENT.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: INCORRECT OPERATION — OTHER INCORRECT OPERATION.

PHMSA indexed costs: $24,325 reported total cost, $11,890.466 in 1984 dollars, $29,282.559 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.