DCP MIDSTREAM

Incident Narrative

NGL TECH DISPATCHED TO DCP SONORA PUMP STATION BY CONTROL CENTER AT 2:00 AM DUE TO STATIONARY GAS DETECTOR ALARM. WHEN THE TECH ARRIVED ON SITE, A LEAK WAS DISCOVERED AT THE 1 INCH UNION ON THE THERMAL EXPANSION PIPING OF THE SAND HILLS PIPELINE (SAHI-1) PIG RECEIVER LOCATED INSIDE THE PUMP STATION. LEAK WAS LOCATED AT APPROXIMATELY 4:00 AM. NGL LEAK WAS ON A 1 INCH UNION ON THE EQUALIZING LINE TIED TO THE 20 INCH RECEIVER AT SONORA PUMP STATION. LEAK WAS ISOLATED BY SHUTTING TWO 1 INCH VALVES ON THE EQUALIZING LINE. THE TECH WAS ABLE TO ISOLATE THE LEAK AND TIGHTEN THE LEAKING FITTING. THE EQUALIZING LINE WAS THEN RETURNED TO SERVICE. THERE HAD BEEN RECENT MAINTENANCE ACTIVITY PERFORMED WHICH REQUIRED THE REMOVAL AND RE-INSTALLMENT OF THE PIG RECEIVER THE UNION IS ASSOCIATED WITH. IT IS BELIEVED THAT THE 1"" UNION WAS NOT ADEQUATELY TIGHTENED DURING INSTALLATION. DCP HAS YET TO IDENTIFY THE PERSON WHO FAILED TO PROPERLY TIGHTEN THE FITTING THAT EVENTUALLY LEAKED. DCP WILL ADD TO THE AGENDA FOR ALL NGL OPERATIONS GROUPS NEXT SEQUENTIAL SAFETY MEETING A REVIEW OF DCP PROCEDURE ""DCP-MGMT-14 ADMIN PROCEDURE COMMISSIONING AND STARTUP"". THERE IS A SECTION OF THIS PROCEDURE PROVIDING GUIDANCE ON LEAK CHECKS PRIOR TO START UP.