MUSTANG PIPE LINE PARTNERS

Incident Narrative

ENBRIDGE PIPELINES IS SUBMITTING THIS REPORT ON BEHALF OF THE MUSTANG PIPELINE PARTNERS. AT APPROXIMATELY 12:25 P.M. LOCAL TIME, ENBRIDGE OPERATIONS PERSONNEL WERE CONTACTED BY A SHELL EMPLOYEE ABOUT A LEAKING PRESSURE CONTROL VALVE AT THE MUSTANG PIPELINE PARTNERS FACILITY LOCATED WITHIN THE SHELL TERMINAL SITE. UPON ARRIVAL, ENBRIDGE OPERATIONS PERSONNEL IDENTIFIED THE LEAKING COMPONENT AND THE PRESSURE CONTROL VALVE WAS ISOLATED. PIPELINE MAINTENANCE STAFF WERE DISPATCHED TO INVESTIGATE AND REPAIR. THE SYSTEM WAS NOT IN OPERATION AT THE TIME OF THE LEAK. THE PRESSURE CONTROL VALVE WAS BYPASSED TO FACILITATE FUTURE OPERATIONS. THE RELEASED PRODUCT WAS COLLECTED AND THE ASSOCIATED CONTAMINATED SOIL WAS COLLECTED AND DISPOSED OF AT A REGULATED FACILITY. THE PRESSURE CONTROL VALVE WAS REMOVED AND SENT TO A LOCAL VALVE SERVICE VENDOR FOR INSPECTION. THE VALVE HAS SINCE BEEN REPAIRED AND RETURNED TO SERVICE. INVESTIGATION ON THE EXACT CAUSE OF VALVE FAILURE IS ONGOING BUT PRELIMINARY FINDINGS INDICATE AN ISSUE WITH THE VALVE BODY GASKET. CAUSE OF THE VALVE FAILURE WILL BE SUBJECT TO A SUPPLEMENTAL REPORT. UPDATE - FOLLOWING AN INTERNAL INCIDENT INVESTIGATION, INCLUDING EVALUATIONS AND REVIEW BY A VALVE REPAIR COMPANY, IT APPEARS THE CAUSE WAS ATTRIBUTED TO OVER TORQUE OF MAIN BODY BOLTS DURING ASSEMBLY THAT OVER COMPRESSED THE GASKET, WHICH LEAD TO THE GASKET FAILURE AND LEAK. THE VALVE WAS REPAIRED AND PUT BACK TO SERVICE. THIS ISSUE WAS COMMUNICATED INTERNALLY TO THE APPROPRIATE DEPARTMENTS WITHIN THE COMPANY.