WILLIAMS FIELD SERVICES - GULF COAST COMPANY, LP

Incident Narrative

2/10/22 LOPC AT BTN1 WILLIAMS AND COVESTRO CONTROL CENTERS RESPOND TO GAS DETECTOR ALARMS AT 1:47 AM. COVESTRO PERSONAL REPORTED WHAT APPEARS TO BE A STEM LEAK ON MOV-0201. GAS DETECTOR READINGS SPIKED AT 120 PPM. WITH WATER SPRAY, READINGS DROPPED TO 16-18 PPM RANGE. AT 1:47AM, LINE PRESSURE WAS 351 UPSTREAM OF -0201, INLET TEMP WAS 54.29. DATA BEING GATHERED FOR LEAK CALCULATION. CONTROL CENTER CALLED TECHNICIANS TO RESPOND. BRYAN CALLED OPS SUPERVISOR AT 2:04 AM AT BTN1, SDV-0201 AND SDV-0205 HAVE BEEN CLOSED. AT BTN2 UPSTREAM, SDV-0201 WAS CLOSED. THE SOC HAS BEEN CALLED. TECHNICIANS ARE RESPONDING TO THE LOCATION. 4:10 AM TECHNICIANS HAVE MADE IT ON SITE. STARTED TO INJECT PACKING INTO THE VALVE STEM. 4:19 AM OPS SUPERVISOR RECEIVES CALL FROM EPA RESPONSE FOLKS ASKING IF THE LEAK HAD BEEN STOPPED. PROVIDED NRC#1328571AND CALL BACK # 866-372-7745 5:45 AM LEAK IS STOPPED WITH MOV-201 VALVE FULLY OPENED OR CLOSED. WAS NOT ABLE TO STOP THE LEAK WHEN THE VALVE IS IN TRANSIT. THE VALVE IS LOCKED OUT IN THE OPEN POSITION. 7:25 AM TEMP MOC BEING CREATED TO LEAVE MOV-0201 POWERED OFF AND USE BTN1-MOV-0205 AS THE VALVE TO BE CLOSED FOR A NORMAL SHUTDOWN OF THE PIPE. A THIRD PARTY CONTRACTOR WILL BE BROUGHT IN TO FLUSH STEM PACKING. 7:31 AM THE CONTROL CENTER HAS BEEN NOTIFIED THAT NORMAL FLOW CAN RESUME. 8:45 FOLLOW UP CALL FROM EPA RESPONSE FOLKS TO SEE IF LEAK WAS STOPPED? HOW IT WAS STOPPED? REPORTED AS STOPPED AT 5:45 AM. FROM PACKING INJECTION. 9:25 AM SENT ADDITIONAL INFORMATION TO DIVISION ENGINEER FOR LEAK CALCULATION. UPDATE: THE ROOT CAUSE WAS A STEM PACKING FAILURE DUE TO DRIED OUT PACKING. AS A MITIGATIVE RESPONSE, WE HAVE ESTABLISHED PM'S TO FLUSH THE PACKING AND PREVENT IT FROM DRYING OUT AGAIN.