OZARK GAS TRANSMISSION, L.L.C. (SPECTRA ENERGY PARTNERS, LP)

Incident Narrative

ORIGINAL REPORT: 48 HR NRC REPORT 1263227 AT APPROXIMATELY 5:36 P.M. CST ON NOVEMBER 5, 2019, OZARK GAS TRANSMISSION'S (OGT) 10-INCH DIAMETER LINE 2 TRANSPORTING NATURAL GAS FROM STANDING ROCK COMPRESSOR STATION TO THE END OF LINE IN CLAY COUNTY ARKANSAS FAILED AT MP 251.402. THE FAILURE RESULTED IN A RUPTURE WITHOUT FIRE. THERE WERE NO INJURIES OR FATALITIES OR EVACUATIONS. OGT'S GAS CONTROL RECEIVED A LOW LOW ALARM AT 5:36 PM CST AND SUBSEQUENTLY DISPATCHED OGT PERSONNEL TO THE FAILURE SITE. OGT'S GAS CONTROL REMOTELY CLOSED UPSTREAM AND DOWNSTREAM VALVES AT 5:48 PM CST, AND FURTHER ISOLATED THE RUPTURED SECTION OF PIPELINE BY MANUALLY CLOSING A VALVE NEARER TO THE RUPTURE SITE AT 8:07 PM CST. OGT PERSONNEL ARRIVED AT THE FAILURE SITE AT 7:15 PM CST AND BELIEVED THAT THE PIPELINE WAS LEAKING BUT NOT RUPTURED. THE NRC WAS NOTIFIED AT 8:28 PM CST OF AN APPARENT LEAK, AS SOON AS LOCATION INFORMATION FOR THE SITE WAS AVAILABLE. THE NRC WAS UPDATED THE FOLLOWING MORNING WITH INFORMATION CONFIRMING THERE HAD BEEN A RUPTURE WITH NO FIRE, CONFIRMED IN THE FIELD AFTER DAYLIGHT. THE SECTION OF THE LINE IS STILL ISOLATED AND SHUTDOWN. A 3RD PARTY METALLURGICAL INVESTIGATION IS ONGOING. THE APPARENT CAUSE IS PENDING. SUPPLEMENTAL REPORT 05/04/2020 THE CAUSE OF THIS INCIDENT IS THIRD PARTY DAMAGE. NOTE THAT THE PIPE ENDS DOWNSTREAM OF THE INCIDENT SITE AND DOES NOT HAVE A SOURCE OF GAS TO CONTINUOUSLY FEED FROM THAT SIDE. AS SUCH, THE LOCAL TIME OF FINAL UPSTREAM AND DOWNSTREAM IS UPDATED ON PART A.22.C AND PART A.22.F